Updated on 2025/06/07
Ph.D. ( 1996.9 Massachusetts Institute of Technology )
マントル岩石学
Natural Science / Solid earth sciences
Japan Agency for Marine-Earth Science and Technology Guest Researcher
2021.4 - 2024.3
Japan Agency for Marine-Earth Science and Technology Visiting Principal Researcher
2014.4 - 2021.3
Niigata University Faculty of Science Professor
2013.5
Country：Japan
Niigata University Graduate School of Science and Technology Professor
2013.5
Country：Japan
Niigata University Faculty of Science Associate Professor
2004.4 - 2013.4
Country：Japan
Niigata University Faculty of Science Associate Professor (as old post name)
1999.10 - 2004.3
Country：Japan
Niigata University Faculty of Science Lecturer
1997.10 - 1999.9
Country：Japan
Niigata University Professor
2013.5
Niigata University Graduate School of Science and Technology Environmental Science and Technology Professor
2013.5
Niigata University Graduate School of Science and Technology Environmental Science and Technology Professor
2013.5
Niigata University Faculty of Science Department of Geology Professor
2013.5 - 2017.3
Niigata University Faculty of Science Department of Geology Associate Professor
2004.4 - 2013.4
Niigata University Faculty of Science Lecturer
1997.1 - 1999.9
Massachusetts Institute of Technology Department of Earth, Atmospheric and Planetary Sciences
1990.9 - 1996.6
Country： United States
Kumamoto University Graduate School of Science and Technology 環境科学専攻
1989.4 - 1995.3
Country： Japan
Hokkaido University 大学院理学研究科 地質学鉱物学専攻
1987.4 - 1989.3
Country： Japan
Hokkaido University School of Science 地質学鉱物学科
1982.4 - 1986.3
Country： Japan
Variable Upper Mantle Geochemical Processes Constrained From Independent Component Analysis of the Fizh Massif, Northern Oman Ophiolite
Yuto Miki, Eiichi Takazawa, Kenta Ueki, Tatsu Kuwatani
Geochemistry, Geophysics, Geosystems 2025.3
Petrogenesis and tectonic evolution of mineralized mafic intrusions in the Eastern Desert of Egypt: Implications for gold–sulfide genesis
Mohamed Zaki Khedr, Mohamed H. Ghoneim, Weal Hagag, Christoph Hauzenberger, Akihiro Tamura, Yuji Ichiyama, Eiichi Takazawa, Ali Y. Kahal, Kamal Abdelrahman, Sara Zamzam, Tomoaki Morishita, Amr El-Awady
Ore Geology Reviews 173 2024.10
Mineralogy and Geochemistry of Titaniferous Iron Ores in El-Baroud Layered Gabbros: Fe-Ti Ore Genesis and Tectono-Metallogenetic Setting
Mohamed Zaki Khedr, Ahmed Moftah, N. H. El-Shibiny, Akihiro Tamura, Wei Tan, Yuji Ichiyama, Eiichi Takazawa, Ali Y. Kahal, Kamal Abdelrahman
Minerals 14 ( 7 ) 2024.7
Mineralogy and Geochemistry of Jasperoid Veins in Neoproterozoic Metavolcanics: Evidence of Silicification, Pyritization and Hematization
Mohamed Zaki Khedr, Mahmoud A. Sayed, Shehata Ali, Mokhles K. Azer, Yuji Ichiyama, Eiichi Takazawa, Ali Y. Kahal, Kamal Abdelrahman, Ali M. Mahdi
Minerals 14 ( 7 ) 2024.7
Genesis of Rare Metal Granites in the Nubian Shield: Tectonic Control and Magmatic and Metasomatic Processes
Mohamed Zaki Khedr, Saif M. Abo Khashaba, Eiichi Takazawa, Safaa M. Hassan, Mokhles K. Azer, N. H. El-Shibiny, Kamal Abdelrahman, Yuji Ichiyama
Minerals 2024.5
Prof. Mohamed Khedr, Gehad M. Saleh, Abdelfadil, K. M., Eiichi Takazawa, kamal Hassanein, Akihiro Tamura, Shaimaa Ali El-Shafei
Minerals 2024.4
The magnesium isotopic composition of the mantle
Xiao-Ning Liu, Remco C. Hin, Christopher D. Coath, Michael Bizimis, Li Su, Dmitri A. Ionov, Eiichi Takazawa, Richard Brooker, Tim Elliott
Geochimica et Cosmochimica Acta 2023.10
Remote sensing and geochemical investigations of sulfide-bearing metavolcanic and gabbroic rocks (Egypt): Constraints on host-rock petrogenesis and sulfide genesis
Mohamed Zaki Khedr, Samir Kamh, Ahmed A. Al Desouky, Eiichi Takazawa, Christoph Hauzenberger, Scott A. Whattam, Amr El-Awady
Gondwana Research 2023.7
Mohamed Zaki Khedr, Saif M. Abo Khashaba, N. H. El-Shibiny, Eiichi Takazawa, Safaa M. Hassan, Mokhles K. Azer, Scott A. Whattam, Reda A. El-Arafy, Yuji Ichiyama
International Journal of Earth Sciences 2023.6
Application of remote sensing data integration in detecting mineralized granitic zones: A case study of the Gabal Al-Ijlah Al-Hamra, Central Eastern Desert, Egypt
Saif M. Abo Khashaba, N.H. El-Shibiny, Safaa M. Hassan, Eiichi Takazawa, Mohamed Zaki Khedr
Journal of African Earth Sciences 200 104855 - 104855 2023.4
Genesis and evaluation of heavy minerals in black sands: A case study from the southern Eastern Desert of Egypt Reviewed
Mohamed Zaki Khedr, Hamada Zaghloul, Eiichi Takazawa, Hesham El-Nahas, Mokhles K. Azer, Shaimaa Ali El-Shafei
Geochemistry 83 ( 1 ) 125945 - 125945 2023.4
Preface: Special Issue on Ophiolites and Oceanic Lithosphere
Peter B. Kelemen, Jürg M. Matter, Damon A.H. Teagle, Jude A. Coggon, Marguerite Godard, Katsuyoshi Michibayashi, Eiichi Takazawa, Alexis S. Templeton, Ken Williams, Zaher Al Sulaimani
Journal of Geophysical Research: Solid Earth 128 ( 4 ) 2023.4
The cadmium and zinc isotope compositions of the silicate Earth – Implications for terrestrial volatile accretion Reviewed
Harvey Pickard, Emeliana Palk, Maria Schönbächler, Rebekah E.T. Moore, Barry J. Coles, Katharina Kreissig, Katrina Nilsson-Kerr, Samantha J. Hammond, Eiichi Takazawa, Christophe Hémond, Peter Tropper, Dan N. Barfod, Mark Rehkämper
Geochimica et Cosmochimica Acta 338 165 - 180 2022.12
Mohamed Zaki Khedr, Saif M. Abo Khashaba, N. H. El-Shibiny, Reda A. El-Arafy, Eiichi Takazawa, Mokhles K. Azer, Richard. M. Palin
International Journal of Earth Sciences 111 ( 7 ) 2409 - 2443 2022.10
Styles of Fe–Ti–V ore deposits in the Neoproterozoic layered mafic-ultramafic intrusions, south Eastern Desert of Egypt: Evidence for fractional crystallization of V-rich melts Reviewed
Mohamed Zaki Khedr, Eiichi Takazawa, Shoji Arai, Robert J. Stern, Tomoaki Morishita, Amr El-Awady
Journal of African Earth Sciences 194 104620 - 104620 2022.10
Yoshihiko Tamura, Mathieu Rospabé, Gou Fujie, Akane Ohira, Kentaro Kaneda, Alexander R. L. Nichols, Georges Ceuleneer, Tomoki Sato, Shuichi Kodaira, Seiichi Miura, Eiichi Takazawa
Island Arc 31 ( 1 ) 2022.9
Titanium isotope heterogeneity in the Earth’s mantle: A case study of the Horoman peridotite massif Reviewed
Merislava Anguelova, Manuela A. Fehr, Eiichi Takazawa, Maria Schönbächler
Geochimica et Cosmochimica Acta 2022.7
The magnesium isotopic compositions of the crust and mantle: A study on the Oman ophiolite Reviewed
Jiwon Eom, Toshihiro Yoshimura, Norikatsu Akizawa, Shigeyuki Wakaki, Tsuyoshi Ishikawa, Eiichi Takazawa, Kyoko Yamaoka, Hodaka Kawahata
Chemical Geology 120969 - 120969 2022.6
Petrogenesis of arc-related serpentinized peridotites (Egypt): Insights into Neoproterozoic mantle evolution beneath the Arabian-Nubian Shield Reviewed
Mohamed Zaki Khedr, Eiichi Takazawa, Christoph Hauzenberger, Akihiro Tamura, Shoji Arai, Robert James Stern, Tomoaki Morishita, Amr El-Awady
Journal of Asian Earth Sciences 226 105078 - 105078 2022.4
Geochemical characterization of the Oman Crust‐Mantle transition zone, OmanDP Holes CM1A and CM2B Reviewed
F. Kourim, M. Rospabé, N. Dygert, S. Chatterjee, E. Takazawa, K‐L. Wang, M. Godard, M. Benoit, M. Giampouras, K. Ishii, D. A‐H Teagle, M‐J. Cooper, P. Kelemen
Journal of Geophysical Research: Solid Earth 2022.3
Mathieu Rospabé, Fatma Kourim, Akihiro Tamura, Eiichi Takazawa, Manolis Giampouras, Sayantani Chatterjee, Keisuke Ishii, Matthew J. Cooper, Marguerite Godard, Elliot Carter, Natsue Abe, Kyaw Moe, Damon A. H. Teagle
Scientific Drilling 30 75 - 99 2022.2
Peter B. Kelemen, Juan Carlos de Obeso, James A. Leong, Marguerite Godard, Keishi Okazaki, Alissa J. Kotowski, Craig E. Manning, Eric T. Ellison, Manuel D. Menzel, Janos L. Urai, Greg Hirth, Matthew Rioux, Daniel F. Stockli, Romain Lafay, Andreas M. Beinlich, Jude A. Coggon, Nehal H. Warsi, Jürg M. Matter, Damon A. H. Teagle, Michelle Harris, Katsuyoshi Michibayashi, Eiichi Takazawa, Zaher Al Sulaimani
Journal of Geophysical Research: Solid Earth 127 ( 2 ) 2022.2
de Obeso, J.C., Kelemen, P.B., Leong, J.M., Menzel, M.D., Manning, C.E., Godard, M., Cai, Y., Bolge, L., Matter, J., Teagle, D., Coggon, J., Harris, M., Bennett, E., Bompard, N., Boulanger, M., France, L., Früh-Green, G., Garbe-Schönberg, D., Ildefonse, B., Jesus, A., Koepke, J., Koornneef, L., Lafay, R., Lissenberg, J., MacLeod, C., Mock, D., Morris, T., Müller, S., Noël, J., Nothaft, D., Perez, A., Pezard, P., Warsi, N., Zeko, D., Zihlmann, B., Bechkit, M., Brun, L., Célérier, B., Henry, G., Paris, J., Lods, G., Robert, P., Al Amri, S., Al Shukaili, M., Al Qassabi, A., Moe, K., Yamada, Y., Takazawa, E., Michibayashi, K., Abe, N., Akitou, T., AlShahri, S.A., Hamed Shames Al-Siyabi, H., Alhumaimi, S.M., AlRawahi, M.H., Al Sarmi, M.S., Alwaeli, B.H., Beinlich, A., Carter, E., Cheadle, M., Cloos, M., Cooper, M., Crispini, L., Deamer, L., Deans, J., Faak, K., Greenberger, R., Harigane, Y., Hatakeyama, K., Horst, A., Hoshide, T., Ishii, K., Johnson, K., Kettermann, M., Kim, H., Kondo, K., Kotowski, A., Kourim, F., Kusano, Y., Menzies, C., Morishita, T., Nguyen, D.K., Nozaka, T., Okazaki, K., Picazo, S., Senda, R., Tateishi, Y., Till, J., Umino, S., Urai, J., Usui, Y., D’Andres, J.
Journal of Geophysical Research: Solid Earth 127 ( 1 ) 2022
Peter B. Kelemen, James A. Leong, Juan Carlos de Obeso, Jürg M. Matter, Eric T. Ellison, Alexis Templeton, Daniel B. Nothaft, Alireza Eslami, Katy Evans, Marguerite Godard, Benjamin Malvoisin, Jude A. Coggon, Nehal H. Warsi, Philippe Pézard, Saebyul Choe, Damon A. H. Teagle, Katsuyoshi Michibayashi, Eiichi Takazawa, Zaher Al Sulaimani
Journal of Geophysical Research: Solid Earth 126 ( 12 ) 2021.12
Operating outdated EPMA (JXA-8600SX) by popular microcomputers and Windows PC Reviewed
Hayato Ueda, Eiichi Takazawa
The Journal of the Geological Society of Japan 127 ( 11 ) 681 - 686 2021.11
Achievements and Future Prospects of the ICDP Oman Drilling Project Invited Reviewed
Eiichi TAKAZAWA
Journal of Geography (Chigaku Zasshi) 130 ( 4 ) 507 - 525 2021.8
Sayantani CHATTERJEE, Debaditya BANDYOPADHYAY, Eiichi TAKAZAWA, Katsuyoshi MICHIBAYASHI
Journal of Mineralogical and Petrological Sciences 116 ( 3 ) 170 - 175 2021.6
Sasidharan A. SILPA, M. SATISH–KUMAR, Eiichi TAKAZAWA, Krishnan SAJEEV
Journal of Mineralogical and Petrological Sciences 116 ( 2 ) 108 - 112 2021
Yuan YAO, Eiichi TAKAZAWA, Sayantani CHATTERJEE, Antonin RICHARD, Christophe MORLOT, Laura CR{\'{E } }ON, Salim AL{\textendash}BUSAIDI, Katsuyoshi MICHIBAYASHI
Journal of Mineralogical and Petrological Sciences 115 ( 3 ) 247 - 260 2020.4
The non-chondritic Ni isotope composition of Earth's mantle Reviewed
Martijn Klaver, Dmitri A. Ionov, Eiichi Takazawa, Tim Elliott
GEOCHIMICA ET COSMOCHIMICA ACTA 268 405 - 421 2020.1
Scientific Drilling Across the Shoreline Reviewed
Sean Gulick, Kenneth Miller, Peter Keleman, Joanna Morgan, Jean-Noel Proust, Eiichi Takazawa
Oceanography 32 ( 1 ) 157 - 159 2019.3
In situ carbon mineralization in ultramafic rocks: Natural processes and possible engineered methods Reviewed
P.B. Kelemen, R. Aines, E. Bennett, S.M. Benson, E. Carter, J.A. Coggon, J.C. de Obeso, O. Evans, G. Gadikota, G.M. Dipple, M. Godard, M. Harris, J.A. Higgins, K.T.M. Johnson, F. Kourim, R. Lafay, S. Lambart, C.E. Manning, J.M. Matter, K. Michibayashi, T. Morishita, J. Noël, K. Okazaki, P. Renforth, B. Robinson, H. Savage, R. Skarbek, M.W. Spiegelman, E. Takazawa, D. Teagle, J.L. Urai, J. Wilcox
Energy Procedia 146 92 - 102 2018.7
Tectonic affinities of the accreted basalts in southern Taiwan Reviewed
Hsin-Yu Chen, Huai-Jen Yang, Yung-Hsin Liu, Kuo-Fang Huang, Eiichi Takazawa
JOURNAL OF ASIAN EARTH SCIENCES 158 253 - 265 2018.6
Evaluation of time-resolved mean-of-ratios reduction for laser ablation zircon U-Pb dating using quadrupole ICPMS Reviewed
Hayato Ueda, Eiichi Takazawa, Rinpei Kato, Yoshiko Adachi
GEOCHEMICAL JOURNAL 52 ( 3 ) 241 - 254 2018
Reductive Heating Experiments on BOF-Slag: Simultaneous Phosphorus Re-Distribution and Volume Stabilization for Recycling Reviewed
Tung-Hsin Su, Huai-Jen Yang, Yu-Chen Lee, Yen-Hong Shau, Eiichi Takazawa, Ming-Fong Lin, Jin-Luh Mou, Wei-Teh Jiang
STEEL RESEARCH INTERNATIONAL 87 ( 11 ) 1511 - 1526 2016.11
Distribution and hosts of arsenic in a sediment core from the Chianan Plain in SW Taiwan: Implications on arsenic primary source and release mechanisms Reviewed
Huai-Jen Yang, Chi-Yu Lee, Yu-Ju Chiang, Jiin-Shuh Jean, Yen-Hong Shau, Eiichi Takazawa, Wei-Teh Jiang
SCIENCE OF THE TOTAL ENVIRONMENT 569 212 - 222 2016.11
Sr and Nd Isotopic evidence in metacarbonate rocks for an extinct Island arc-ocean system in East Antarctica Reviewed
Naho Otsuji, M. Satish-Kumar, Atsushi Kamei, Eiichi Takazawa, Noriyoshi Tsuchiya, G. H. Grantham, Tetsuo Kawakami, Masahiro Ishikawa, Yasuhito Osanai
JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES 111 ( 3 ) 170 - 180 2016.6
CO2 sequestration utilizing basic-oxygen furnace slag: Controlling factors, reaction mechanisms and V-Cr concerns Reviewed
Tung-Hsin Su, Huai-Jen Yang, Yen-Hong Shau, Eiichi Takazawa, Yu-Chen Lee
JOURNAL OF ENVIRONMENTAL SCIENCES 41 99 - 111 2016.3
Shuto, K., Nohara-Imanaka, R., Sato, M., Takahashi, T., Takazawa, E., Kawabata, H., Takanashi, K., Ban, M., Watanabe, N., Fujibayashi, N.
Journal of Petrology 56 ( 11 ) 2257 - 2294 2015.12
Decoupling of the Lu-Hf, Sm-Nd, and Rb-Sr isotope systems in eclogites and a garnetite from the Sulu ultra-high pressure metamorphic terrane: Causes and implications Reviewed
Yung-Hsin Liu, Huai-Jen Yang, Eiichi Takazawa, Madhusoodhan Satish-Kumar, Chen-Feng You
LITHOS 234 1 - 14 2015.10
The influence of melt infiltration on the Li and Mg isotopic composition of the Horoman Peridotite Massif Reviewed
Yi-Jen Lai, Philip A. E. Pogge von Strandmann, Ralf Dohmen, Eiichi Takazawa, Tim Elliott
GEOCHIMICA ET COSMOCHIMICA ACTA 164 318 - 332 2015.9
Compositional and Sr-Nd-Hf isotopic variations of Baijingsi eclogites from the North Qilian orogen, China: Causes, protolith origins, and tectonic implications Reviewed
Choon-Muar Ker, Huai-Jen Yang, Jianxin Zhang, Yen-Hong Shau, Chia-Ju Chieh, Fancong Meng, Eiichi Takazawa, Chen-Feng You
GONDWANA RESEARCH 28 ( 2 ) 721 - 734 2015.9
Melt extraction and metasomatism recorded in basal peridotites above the metamorphic sole of the northern Fizh massif, Oman ophiolite Reviewed
Masako Yoshikawa, Marie Python, Akihiro Tamura, Shoji Arai, Eiichi Takazawa, Tomoyuki Shibata, Akira Ueda, Tsutomu Sato
TECTONOPHYSICS 650 53 - 64 2015.5
Repeated magmatism at 34 Ma and 23-20 Ma producing high magnesian adakitic andesites and transitional basalts on southern Okushiri Island, NE Japan arc Reviewed
Makoto Sato, Kenji Shuto, Rikako Nohara-Imanaka, Eiichi Takazawa, Yasuhito Osanai, Nobuhiko Nakano
LITHOS 205 60 - 83 2014.9
A kilometre-scale highly refractory harzburgite zone in the mantle section of the northern oman ophiolite (fizh block): Implications for flux melting of oceanic lithospheric mantle Reviewed
Nami Kanke, Eiichi Takazawa
Geological Society Special Publication 392 ( 1 ) 229 - 246 2014
Petrological nature and origin of the ultramafic complex in the basal part of the Salahi mantle section, the Oman ophiolite Reviewed
野本有希, 高澤栄一
岩石鉱物科学 42 ( 3 ) 123-135 (J-STAGE) - 135 2013
Scientific drilling and related research in the samail ophiolite, sultanate of Oman Reviewed
Peter Kelemen, Ali Al Rajhi, Marguerite Godard, Benoit Ildefonse, Jürgen Köpke, Chris MacLeod, Craig Manning, Katsu Michibayashi, Sobhi Nasir, Everett Shock, Eiichi Takazawa, Damon Teagle
Scientific Drilling ( 15 ) 64 - 71 2013
スコットランド南東部シッカー岬とハットンの不整合 Reviewed
道林克禎, 森下知晃, 村山雅史, 西弘嗣, 尾鼻浩一郎, 鈴木庸平, 高澤栄一, 山田泰広, 横山祐典
地質学雑誌 118 ( 11 ) IX-X - X 2012.11
Preface Reviewed
MORISHITA Tomoaki, ABE Natsue, MIZUKAMI Tomoyuki, OZAWA Kazuhito, TAKAZAWA Eiichi
Japanese Magazine of Mineralogical and Petrological Sciences 41 ( 5 ) 171 - 173 2012.9
Melting and reaction in an incipient subarc mantle as inferred from the spatial compositional variability in the mantle section of the Oman ophiolite Reviewed
Eiichi Takazawa
Japanese Magazine of Mineralogical and Petrological Sciences 41 ( 6 ) 257 - 266 2012
The mohole: A crustal journey and mantle quest, workshop in Kanazawa, Japan, 3-5 June 2010 Reviewed
Benoît Ildefonse, Natsue Abe, Donna K. Blackman, J. Pablo Canales, Yoshio Isozaki, Shuichi Kodaira, Greg Myers, Kentaro Nakamura, Mladen Nedimovic, Alexander C. Skinner, Nobukazu Seama, Eiichi Takazawa, Damon A.H. Teagle, Masako Tominaga, Susumu Umino, Douglas S. Wilson, Masaoki Yamao
Scientific Drilling 10, 56-63 ( 10 ) 56 - 63 2010.9
Shallow Mantle Composition and Dynamics: Fifth International Orogenic Lherzolite Conference Reviewed
Martin Menzies, Peter Kelemen, Henry Dick, Jean-Louis Bodinier, Francoise Boudier, Greg Hirth, Tim Grove, Andrea Tommasi, Eiichi Takazawa
JOURNAL OF PETROLOGY 51 ( 1-2 ) 3 - 7 2010.1
Primary melting sequence of a deep (> 250 km) lithospheric mantle as recorded in the geochemistry of kimberlite-carbonatite assemblages, Snap Lake dyke system, Canada Reviewed
A. M. Agashev, N. P. Pokhilenko, E. Takazawa, J. A. McDonald, M. A. Vavilov, T. Watanabe, N. V. Sobolev
Chemical Geology 255 ( 3-4 ) 317 - 328 2008.10
Origin of layering observed in the Horoman peridotite complex, Japan
Niida Kiyoaki, Takasawa Eiichi
The Journal of the Geological Society of Japan 113 S167 - S184 2007
Morishita, T., Takazawa, E., Arai, S., Obata, M., Kodera, T., Gervilla, F.
Island Arc 15 ( 1 ) 2 - 3 2006.3
Geochemical secular variation of magma source during Early to Middle Miocene time in the Niigata area, NE Japan: Asthenospheric mantle upwelling during back-arc basin opening Reviewed
K Shuto, H Ishimoto, Y Hirahara, M Sato, K Matsui, N Fujibayashi, E Takazawa, K Yabuki, M Sekine, M Kato, AI Rezanov
LITHOS 86 ( 1-2 ) 1 - 33 2006.1
Compositional continuity and discontinuity in the Horoman peridotite, Japan, and its implication for melt extraction processes in partially molten upper mantle Reviewed
M Obata, E Takazawa
JOURNAL OF PETROLOGY 45 ( 2 ) 223 - 234 2004.2
P-211 Hybridization of dunite and gabbroic materials observed in Hole 1271B, ODP Leg 209
Takazawa Eiichi, Abe Natsue, Kikawa Eiichi
Annual Meeting of the Geological Society of Japan 2004 265 - 265 2004
Geochemistry and origin of the basal lherzolites from the northern Oman ophiolite (northern Fizh block) Reviewed
E Takazawa, T Okayasu, K Satoh
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 4 2003.2
Model of layering formation in a mantle peridotite (Horoman,Hokkaido, Japan) Reviewed
Toramaru, A., Takazawa, E., Morishita, T., Matsukage, K.
Earth and Planetary Science Letters 185 ( 3-4 ) 299 - 313 2001.3
Re-Os isotopes in the Horoman peridotite: Evidence for refertilization? Reviewed
AE Saal, E Takazawa, FA Frey, N Shimizu, Hart, SR
JOURNAL OF PETROLOGY 42 ( 1 ) 25 - 37 2001.1
Whole rock compositional variations in an upper mantle peridotite (Horoman, Hokkaido, Japan): Are they consistent with a partial melting process? Reviewed
E Takazawa, FA Frey, N Shimizu, M Obata
GEOCHIMICA ET COSMOCHIMICA ACTA 64 ( 4 ) 695 - 716 2000.2
Permian brachiopods from the Okutadami area, near the boundary between Niigata and Fukushima Prefectures, central Japan and their tectonic implications Reviewed
Tazawa Jun-ichi, Ando Susumu, Furuhashi Shinya, Furuta Kozue, Okayasu Toshie, Shimura Toshiaki, Takazawa Eiichi, Tateishi Masaaki, Watanabe Satoshi, Yamamoto Kazumi, Yamamoto Ryo, Toyoshima Tsuyoshi, Okochi Makoto
Journal of the Geological Society of Japan 105 ( 10 ) 729 - 732 1999.10
Non-chondritic platinum-group element ratios in oceanic mantle lithosphere: petrogenetic signature of melt percolation? Reviewed
M Rehkamper, AN Halliday, J Alt, JG Fitton, J Zipfel, E Takazawa
EARTH AND PLANETARY SCIENCE LETTERS 172 ( 1-2 ) 65 - 81 1999.10
Polybaric petrogenesis of mafic layers in the Horoman peridotite complex, Japan Reviewed
E. Takazawa, F. A. Frey, N. Shimizu, A. Saal, M. Obata
Journal of Petrology 40 ( 12 ) 1827 - 1851 1999
Petrogenesis of mafic layers in the Horoman peridotite complex, Japan
Takazawa, E., Frey, F.A., Shimizu, N., Saal, A., Obata, M.
Ofioliti 24 ( 1 A ) 173 - 173 1999
Takazawa, E., Frey, F.A., Shimizu, N.
Ofioliti 24 ( 1 A ) 1999
Saal, A., Takazawa, E., Frey, F.A., Shimizu, N., Hart, S.
Ofioliti 24 ( 1 A ) 160 - 160 1999
Collapsing carbon nanotubes and diamond formation under shock waves Reviewed
Y. Q. Zhu, T. Sekine, T. Kobayashi, E. Takazawa, M. Terrones, H. Terrones
Chemical Physics Letters 287 ( 5-6 ) 689 - 693 1998.5
Radiation temperatures of soda-lime glass in its shock-compressed liquid state Reviewed
T. Kobayashi, T. Sekine, O. V. Fat'yanov, E. Takazawa, Q. Y. Zhu
Journal of Applied Physics 83 ( 3 ) 1711 - 1716 1998.2
Shock-induced phase transitions among SiC polytypes Reviewed
Y. Q. Zhu, T. Sekine, T. Kobayashi, E. Takazawa
Journal of Materials Science 33 ( 24 ) 5883 - 5890 1998
Hugoniot equation of state and high-pressure transformation of jadeite
Takazawa, E., Sekine, T., Kobayashi, T., Zhu, Y.
Journal of Geophysical Research: Solid Earth 103 ( 6 ) 1998
High pressure carbon behavior induced from carbide Hugoniots
T. Sekine, E. Takazawa, T. Kobayashi
Materials Research Society Symposium - Proceedings 499 99 - 104 1998
Evolution of the Horoman Peridotite (Hokkaido, Japan): Implications from pyroxene compositions Reviewed
E Takazawa, F Frey, N Shimizu, M Obata
CHEMICAL GEOLOGY 134 ( 1-3 ) 3 - 26 1996.12
Navon, O., Frey, F.A., Takazawa, E.
American Mineralogist 81 ( 5-6 ) 1996
GEOCHEMICAL EVIDENCE FOR MELT MIGRATION AND REACTION IN THE UPPER MANTLE Reviewed
E TAKAZAWA, FA FREY, N SHIMIZU, M OBATA, JL BODINIER
NATURE 359 ( 6390 ) 55 - 58 1992.9
Compositional Variations within the Lower Layered Zone of the Horoman Peridotite, Hokkaido, Japan: Constraints on Models for Melt-Solid Segregation Reviewed
Fred A. Frey, N. Shimizu, A. Leinbach, M. Obata, E. Takazawa
JOURNAL OF PETROLOGY 211 - 227 1991
Manganese nodules from the Upper Cretaceous Yubetsu Group, eastern Hokkaido, Japan Reviewed
Masayuki SAKAKIBARA, Kiyoaki NIIDA, Kenji TOGARI, Masahide AKASAKA, Eiichi TAKASAWA, Yoshihiko GOTO, Masako YOSHIKAWA, Gaku KIMURA, Norio KITO, Jun TAJIKA, Takayuki KATO, Hideaki TODA
Jour. Geol. Soc. Japan. 95 ( 3 ) 241 - 244 1989
マフィック岩を包有する不均質なマントルの部分融解に関する地質学的検証
高澤, 栄一
[高澤栄一] 2006
Oman Drilling Project Phase1のリストヴェナイト中のドロマイト脈に薄い塩水からなる流体包有物があるぜよ
川本竜彦, 佐藤宏樹, 高橋藤馬, GUOTANA Juan Miguel, 森下知晃, KELEMEN Peter B, COGGON Jude Ann, HARRIS Michelle, MATTER Juerg Michael, 道林克禎, 高澤栄一, TEAGLE Damon A H
日本地球惑星科学連合大会予稿集(Web) 2019 2019
オマーンオフィオライトWadi Tayin岩体における地殻-マントル境界の岩石学および地球化学的特徴
高澤栄一, 高澤栄一, 木暮優芽斗, CHATTERJEE Sayantani, 小柳夏希, 道林克禎, 田村芳彦
日本地質学会学術大会講演要旨 126th 2019
Mantle-melt interaction at the crust-mantle boundary in the Wadi Tayin massif, the Oman mantle peridotite
高澤栄一, 高澤栄一, 木暮優芽斗, 石井慶佑, CHATTERJEE Sayantani, 小柳夏希, 道林克禎, 田村芳彦
日本鉱物科学会年会講演要旨(Web) 2019 2019
モホのつくり方
田村芳彦, 高澤栄一, 高澤栄一, CEULENEER Georges, 道林克禎, 佐藤智紀, 小平秀一, 三浦誠一
日本地球惑星科学連合大会予稿集(Web) 2018 2018
オマーン陸上掘削第1期ChikyuOman2017におけるオフィオライト地殻セクションの岩石物性研究速報
阿部なつ江, 岡崎啓史, 畠山航平, ILDEFONSE Benoit, LEONG James Andrew, 立石大和, 道林克禎, 高澤栄一, KELEMEN Peter, TEAGLE Damon A H, HARRIS Michelle, COGGON Jude Ann, DE OBESO Juan Calros, MATTER Juerg
日本地球惑星科学連合大会予稿集(Web) 2018 2018
オマーン陸上掘削第1期ChikyuOman2017における岩石物性研究速報
阿部なつ江, 岡崎啓史, 畠山航平, ILDEFONSE Benoit, 立石大和, LEONG James Andrew, 道林克禎, 高澤栄一, KELEMEN Peter, TEAGLE Damon, HARRIS Michelle
ブルーアースサイエンス・テク要旨集 2018 2018
モホ反射面のつくりかた
田村芳彦, 藤江剛, 大平茜, 高澤栄一, CEULENEER Georges, 道林克禎, 佐藤智紀, 小平秀一, 三浦誠一
日本地質学会学術大会講演要旨 125th 2018
Physical property measurement of ICDP Oman Drilling Project (ChikyuOman2017) Phase I-From Oceanic Plate to obduction stage
阿部なつ江, 岡崎啓史, 畠山航平, ILDEFONSE Benoit, 立石大和, LEONG James Andrew, 道林克禎, 高澤栄一, KELEMEN Peter, DE OBESO Juan Calros, TEAGLE Damon, COGGON Jude, HARRIS Michelle
日本鉱物科学会年会講演要旨(Web) 2018 2018
オマーンオフィオライト南部でのハンレイ岩-カンラン岩関係
森下知晃, 荒井章司, KELEMEN Peter, TEAGLE Damon, 石井慶佑, 高澤栄一, NGUYEN Khac Du, COGGON Jude, MATTER Juerg, 道林克禎, 田村芳彦, MOE KhawThu, 山田泰広
日本地質学会学術大会講演要旨 125th 2018
オマーン掘削プロジェクト速報:海洋プレート層序のXCTプロファイル
道林克禎, 高澤栄一, KELEMEN Peter, TEAGLE Damon, HARRIS Michelle, GODARD Marguerite
日本地質学会学術大会講演要旨 125th 2018
ICDPオマーン陸上掘削コア試料に記録されているモホ遷移帯の岩石物性について
阿部なつ江, MOE Kyaw, 山田泰広, 岡崎啓史, 畠山航平, 赤松祐哉, 片山郁夫, 高澤栄一, 道林克禎, KELEMEN Peter, TEAGLE Damon
日本地質学会学術大会講演要旨 125th 2018
ICDP Oman Drilling Project:オマーンオフィオライトWadi Tayin岩体における地殻-マントル境界の掘削
高澤栄一, COGGON Jude, KELEMEN Peter, MATTER Juerg, 道林克禎, 森下知晃, 田村芳彦, TEAGLE Damon, KHAW Thu Moe, 山田泰広
日本地質学会学術大会講演要旨 125th 2018
国際陸上掘削計画による沈み込むプレート境界相当岩石コア(オマーンオフィオライト基底部Listvenite/変成岩境界)の海洋掘削船CHIKYUを用いた記載とその成果
森下知晃, KELEMEN B. Peter, COGGON Judith, MATTER Juerg, HARRIS Michelle, 道林克禎, 高澤栄一, TEAGLE A.H. Damon, GODARD Marguerite
日本鉱物科学会年会講演要旨(Web) 2018 2018
オマーンオフィオライト・ワディタイン岩体CMサイトにおける地殻-マントル遷移帯の陸上掘削
高澤栄一, COGGON Jude Ann, KELEMEN Peter B, MATTER Juerg Michael, 道林克禎, 田村芳彦, TEAGLE Damon A H, KHAWTHU Moe, 山田泰広
日本地球惑星科学連合大会予稿集(Web) 2018 2018
マントルウエッジプレート境界掘削:オマーン陸上掘削-サマイル・オフィオライトの炭酸塩岩化したカンラン岩から下位の変成岩までの掘削成果概要
森下知晃, KELEMEN Peter B, COGGON Judith, MATTER Juerg, HARRIS Michelle, 道林克禎, 高澤栄一, TEAGLE Damon A H, GODARD Marguerti
日本地球惑星科学連合大会予稿集(Web) 2018 2018
海洋底下部地殻ハンレイ岩相の白金族元素存在度とOs同位体組成:ICDP Oman Drilling Project phase1速報
仙田量子, 鈴木勝彦, 森下知晃, KELEMEN Peter, TEAGLE Damon, 高澤栄一, COGGON Jude, MATTER M. Juerg, HARRIS Michelle, 道林克禎
日本地球化学会年会要旨集(Web) 65th 2018
マントル掘削計画~海と陸とちきゅうと~
道林克禎, 高澤栄一, 田村芳彦, 小原泰彦, 岡本敦, 森下知晃, 石塚治, 針金由美子, 藤江剛, 片山郁夫, 渡邊了
ブルーアース要旨集 2017 2017
Science reports of Niigata University. (Geology) 30 89 - 96 2015.3
Takazawa Eiichi, Mori Namiko, Nohara Rikako, Takahashi Toshiro, Adachi Yoshiko, Miyashita Sumio
Science reports of Niigata University. (Geology) 29 48 - 49 2014.10
モホ点描―超深部掘削で何がわかるのか?オマーンオフィオライト・サラヒ岩体マントルセクションの鉱物組成分布からみた海嶺‐島弧変遷プロセス
高澤栄一, 春日良一, 山野井陽一
月刊地球 34 ( 4 ) 252 - 257 2012.4
モホ点描―超深部掘削で何がわかるのか?オマーンオフィオライト・フィズ岩体のマントルセクションに分布するダナイトの空間的な組成変動と成因について
末武杏奈, 高澤栄一
月刊地球 34 ( 4 ) 247 - 251 2012.4
The MoHole: A Crustal Journey and Mantle Quest Workshop Report
ILDEFONSE Benoît, ABE Natsue, BLACKMAN Donna K, CANALES J. Pablo, ISOZAKI Yoshio, KODAIRA Shuichi, MYERS Greg, NAKAMURA Kentaro, NEDIMOVIC Mladen, SKINNER Alesander, SEAMA Nobukazu, TAKAZAWA Eiichi, TEAGLE Damon A.H, TOMINAGA Masako, UMINO Susumu, WILSON Douglas S, YAMAO Masaoki
Workshop Report 1-67 2010.6
Chikyu monthly 30 ( 2 ) 86 - 93 2008.4
Hybridization of dunite and gabbroic materials in Hole 1271B from Mid-Atlantic Ridge 15°N : Implications for melt flow and reaction in the upper mantle
TAKAZAWA E.
Proceedings of the Ocean Drilling Program. Scientific Reports, College Station, TX (Ocean Drilling Program), 2007 209 1 - 23 2007
Spatial variation of trace element abundances in clinopyroxenes from the layered orogenic lherzolite (Horoman peridotite, Japan): Implications for melt flow and reaction in the upper mantle
E Takazawa, FA Frey, N Shimizu, M Obata, JL Bodinier
GEOCHIMICA ET COSMOCHIMICA ACTA 67 ( 18 ) A471 - A471 2003.9
マントル内の延性せん断帯の空間分布から読みとる海洋プレートの断片化過程 北部オマーンオフィオライトの例
道林克禎, 高沢栄一, 岡安冬恵
日本地質学会学術大会講演要旨 108th 2001
Whole-rock compositional variations in an upper mantle peridotite (Horoman, Hokkaido, Japan) : implications for melt segregation, migration and reaction.
TAKAZAWA E.
Geochim. Cosmosim. Act. 64 717 - 732 2000
Sr and Nd isotopes in metacarbonate rocks as proxies for paleo-tectonic reconstruction prior to supercontinent assembly
SATISH-KUMAR Madhusoodhan, OTSUJI Naho, KAMEI Atsushi, TAKAZAWA Eiichi, TSUCHIYA Noriyoshi, GRANTHAM Geoffrey, ISHIKAWA Masahiro, KAWAKAMI Tetsuo, OSANAI Yasuhito
日本地球惑星科学連合大会予稿集(Web) 2015
Spatial evolution of oceanic lithosphere to forearc mantle inferred from mantle section in the northern Oman ophilite
TAKAZAWA E.
Abstract for Int. Conf. Geol. Arabian Plate and the Oman Mount., Muscat, Oman., 2012 2012
P-136 Spatial variability of Mantle-melt reaction in the mantle section of northern Oman ophiolite
Murakami Ryutaro, Takazawa Eiichi, Kanke Nami
2008.9 The Geological Society of Japan
P-156 Distribution of highly refractory peridotites and diversity of mafic dikes in the mantle section of the Oman Ophiolite
Takazawa Eiichi, Murakami Ryutaro, Kimura Jun-ichi
2007.9 The Geological Society of Japan
O-210 Chemical variation in the mantle section of the Fizh block, the Oman Ophilite
Kanke Nami, Takazawa Eiichi
Annual Meeting of the Geological Society of Japan 2004 The Geological Society of Japan
Geochemistry and origin of mafic layers in the Horoman peridotite complex, Japan.
TAKAZAWA E.
Abst. Japan. Earth. Planet. Sci. Joint Meet. 1997
Geodynamic evolution of the Horoman peridotite, Hokkaido, Japan based on geochemical studies of a 140m stratigraphic section
TAKAZAWA E.
Work. on Orogenic lherzolites and mantle processes. Abstr. Granada, Spain 1995
Geochemical characteristics of the Horoman layered ultramafic complex, Hokkaido, Japan : evidence for fluid migration and reaction in the Upper mantle.
TAKAZAWA E.
29th Int. Geol. Congr. Abstr. Kyoto, Japan 1992
Drilling of crust-mantle transition in the Wadi Tayin massif of the Oman ophiolite
Takazawa, E, Michibayashi, K, OmanDP Science Team
InterRidge－Japan Research Meeting 2019.11
オマーンオフィオライトWadi Tayin岩体における地殻ーマント ル境界の岩石学および地球化学的特徴
高澤栄一, 木暮優芽斗, Chatterjee Sayantani, 小柳夏希, 道林克禎, 田村芳彦, The Oman Drilling, Project Science Party
日本地質学会第126年学術大会 2019.9
Mantle-melt interaction at the crust-mantle boundary in the Wadi Tayin massif, the Oman mantle peridotite
Takazawa, E, Kogue, Y, Ishii, K, Chatterjee, S, Oyanagi, N, Michibayashi, K, Tamura, Y
Annual Meeting of Japan Association of Mineralogical Sciences 2019.9
Lower crustal accretion processes revealed from the study of gabbroic cores in Holes GT1A and GT2A, the ICDP Oman Drilling Project
Sayantani Chatterjee, Eiichi Takazawa, Katsuyoshi Michibayashi, Peter B Kelemen, Damon A.H. Teagle, Oman Drilling, Project, Phase I Science Party
Japan Geoscience Union Meeting 2019 2019.5
Overview of drilling of crust-mantle boundary at CM1&2 sites of Wadi Tayin massif of Oman ophiolite: the ICDP Oman Drilling Project
Takazawa, E, Teagle, D.H.A, Michibayashi, K, Tamura, Y, Coggon, J, Matter, J, Kelemen, P.B, Oman Drilling, Project Phase, Science Party
Japan Geoscience Union Meeting 2019 2019.5
Overview of drilling of crust-mantle boundary of Oman ophiolite: the ICDP Oman Drilling Project
Takazawa, E, Teagle, D.A.H, Michibayashi, K, Coggon, J.A, Kelemen, P.B, Oman Drilling, Project Phase, Science Party
Japan Geoscience Union Meeting 2019 2019.5
Oman Drilling Project Phase1のリストヴェナイト中のドロマイト脈に薄い塩水からなる流体包有物があるぜよ
川本竜彦, 佐藤宏樹, 高橋藤馬, GUOTANA Juan Miguel, 森下知晃, KELEMEN Peter B, COGGON Jude Ann, HARRIS Michelle, MATTER Juerg Michael, 道林克禎, 高澤栄一, TEAGLE Damon A H
日本地球惑星科学連合大会予稿集(Web) 2019
A Strength Profile Across the Ocean Crust-Mantle Transition: Oman Drilling Project Sites CM1 and 2 International conference
Yamada, Y, Moe, K, Wspanialy, A, Abe, N, Michibayashi, K, Takazawa, E, Matter, J. M, Teagle, D. A. H, Kelemen, P.B, The Oman Drilling, Project Science Party
AGU Fall Meeting 2018 2018.12
Drilling of the crust - mantle boundary in the Wadi Tayin massif in the Samail ophiolite at Oman Drilling Project Sites CM1 and 2 International conference
Takazawa, E, Teagle, D. A. H, Coggon, J. A, Matter, J. M, Kelemen, P. B, Michibayashi, K, Tamura,Y, Morishita, T, The Oman Drilling, Project Phase, Science Party
AGU Fall Meeting 2018 2018.12 American Geophysical Union
Implication of lower crustal accretion process in the Oman ophiolite: Insight from Oman Drilling Project Hole GT2A International conference
Chatterjee, S, Takazawa, E, Michibayashi, K, Oman Drilling, Project Science Party
AGU Fall Meeting 2018 2018.12 American Geophysical Union
Pure, but not Simple (Shear): Structural Characterization of the gabbroic crust and crust-mantle transition in the Wadi Tayin Massif of the Samail Ophiolite, Oman (Oman Drilling Project Holes CM1A, CM2B, GT1A & GT2A) International conference
Cheadle, M. J, Basch, V, Evans, A, Hirth, G, Jansen, M, Kaczmarek, M. A, Crispini, L, Dearns, J. R, Coggon, J. A, Kelemen, P.B, Matter, J. M, Takazawa, E, Teagle, D. A. H, Oman Drilling, Project Science Party
AGU Fall Meeting 2018 2018.12
Quantification of the downhole degree of serpentinization estimated by X-ray CT core imaging (Oman Drilling Project Phase 2, D/V CHIKYU) International conference
Michibayashi, K, Katayama, I, Kelemen, P.B, Okazaki, K, Godard, M, Takazawa, E, Teagle, D.A.H
AGU Fall Meeting 2018 2018.12
Hydrothermal Alteration of the Crust-Mantle Transition and Upper Mantle in the Samail Ophiolite: Insights from Holes CM1A and CM2B of the Oman Drilling Project International conference
Fruh-Green, G. L, Grabowska, M, Oyanagi, R, Kimura, K, Morishita, T, Okamoto, A, Klein, F, Tamura, A, Teagle, D. A. H, Takazawa, E, Coggon, J. A, Kelemen, P. B, Matter, J. M, OmanDP Phase, Science Party
AGU Fall Meeting 2018 2018.12
Physical property of the fossilized crust-mantle transition zone from ICDP Oman Drilling Project Hole CM1A and CM2B International conference
Okazaki, K, Abe, N, Hatakeyama, K, Akamatsu, Y, Takazawa, E, Teagle, D.A.H, Kelemen, P.B, Coggon, J.A
AGU Fall meeting 2018 2018.12
Initial report of physical property measurements, ChikyuOman 2018: Crust-Mantle boundary and the mantle section from ICDP Oman Drilling Project Phase II International conference
Abe, N, Okazaki, K, Katayama, I, Hatakeyama, K, Ulven, O.I, Hong, G, Zhu, W, Cordonnier, B, Akamatsu, Y, Michibayashi, K, Takazawa, E, Godard, M, Teagle, D. A. H, Kelemen, P.B, matter, J.M, Coggon, J. A, The Oman Drilling, Project, Phase II Science Party
AGU Fall Meeting 2018 2018.12
A Reconnaissance Petrographic Study of Opaque Mineral Assemblages in Peridotites and Mafic Dykes from the Oman Drilling Project Holes BA1B, BA3A and BA4A International conference
Tutolo, B.M, Eslami, A, Evans, K.A, Kahl, W.-A, Godard, M, Kelemen, P.B, Michibayashi, K, Takazawa, E, Teagle, D.A.H
AGU Fall Meeting 2018 2018.12
森下知晃, 荒井章司, KELEMEN Peter, TEAGLE Damon, 石井慶佑, 高澤栄一, NGUYEN Khac Du, COGGON Jude, MATTER Juerg, 道林克禎, 田村芳彦, MOE KhawThu, 山田泰広
日本地質学会学術大会講演要旨 2018.9
田村芳彦, 藤江剛, 大平茜, 高澤栄一, CEULENEER Georges, 道林克禎, 佐藤智紀, 小平秀一, 三浦誠一
日本地質学会学術大会講演要旨 2018.9
ICDPオマーン陸上掘削コア試料に記録されているモホ遷移帯の岩石物性について
阿部なつ江, MOE Kyaw, 山田泰広, 岡崎啓史, 畠山航平, 赤松祐哉, 片山郁夫, 高澤栄一, 道林克禎, KELEMEN Peter, TEAGLE Damon
日本地質学会学術大会講演要旨 2018.9
オマーン掘削プロジェクト速報:海洋プレート層序のXCTプロファイル
道林克禎, 高澤栄一, KELEMEN Peter, TEAGLE Damon, HARRIS Michelle, GODARD Marguerite
日本地質学会学術大会講演要旨 2018.9
ICDP Oman Drilling Project:オマーンオフィオライトWadi Tayin岩体における地殻‐マントル境界の掘削
高澤栄一, COGGON Jude, KELEMEN Peter, MATTER Juerg, 道林克禎, 森下知晃, 田村芳彦, TEAGLE Damon, KHAW Thu Moe, 山田泰広
日本地質学会学術大会講演要旨 2018.9
オマーンオフィオライトWadi Tayin岩体における地殻‐マントル境界の陸上掘削:ICDP Oman Drilling Project
高澤栄一, 高澤栄一, KELEMEN P.B, TEAGLE D.A, MATTER J, COGGON J
日本鉱物科学会年会講演要旨(Web) 2018
海洋底下部地殻ハンレイ岩相の白金族元素存在度とOs同位体組成:ICDP Oman Drilling Project phase1速報
仙田量子, 鈴木勝彦, 森下知晃, KELEMEN Peter, TEAGLE Damon, 高澤栄一, COGGON Jude, MATTER M. Juerg, HARRIS Michelle, 道林克禎
日本地球化学会年会要旨集(Web) 2018
オマーン陸上掘削第1期ChikyuOman2017におけるオフィオライト地殻セクションの岩石物性研究速報
阿部なつ江, 岡崎啓史, 畠山航平, ILDEFONSE Benoit, LEONG James Andrew, 立石大和, 道林克禎, 高澤栄一, KELEMEN Peter, TEAGLE Damon A H, HARRIS Michelle, COGGON Jude Ann, DE OBESO Juan Calros, MATTER Juerg
日本地球惑星科学連合大会予稿集(Web) 2018
阿部なつ江, 岡崎啓史, 畠山航平, ILDEFONSE Benoit, 立石大和, LEONG James Andrew, 道林克禎, 高澤栄一, KELEMEN Peter, DE OBESO Juan Calros, TEAGLE Damon, COGGON Jude, HARRIS Michelle
日本鉱物科学会年会講演要旨(Web) 2018
オマーンオフィオライト・ワディタイン岩体CMサイトにおける地殻‐マントル遷移帯の陸上掘削
高澤栄一, COGGON Jude Ann, KELEMEN Peter B, MATTER Juerg Michael, 道林克禎, 田村芳彦, TEAGLE Damon A H, KHAWTHU Moe, 山田泰広
日本地球惑星科学連合大会予稿集(Web) 2018
マントルウエッジプレート境界掘削:オマーン陸上掘削‐サマイル・オフィオライトの炭酸塩岩化したカンラン岩から下位の変成岩までの掘削成果概要
森下知晃, KELEMEN Peter B, COGGON Judith, MATTER Juerg, HARRIS Michelle, 道林克禎, 高澤栄一, TEAGLE Damon A H, GODARD Marguerti
日本地球惑星科学連合大会予稿集(Web) 2018
ChikyuOman2017~第1期オマーン掘削プロジェクトちきゅう船上記載~
道林克禎, 高澤栄一, KELEMEN Peter, TEAGLE Damon, HARRIS Michelle
ブルーアース要旨集 2018
田村芳彦, 高澤栄一, 高澤栄一, CEULENEER Georges, 道林克禎, 佐藤智紀, 小平秀一, 三浦誠一
日本地球惑星科学連合大会予稿集(Web) 2018
オマーン陸上掘削第1期ChikyuOman2017における岩石物性研究速報
阿部なつ江, 岡崎啓史, 畠山航平, ILDEFONSE Benoit, 立石大和, LEONG James Andrew, 道林克禎, 高澤栄一, KELEMEN Peter, TEAGLE Damon, HARRIS Michelle
ブルーアース要旨集 2018
国際陸上掘削計画による沈み込むプレート境界相当岩石コア(オマーンオフィオライト基底部Listvenite/変成岩境界)の海洋掘削船CHIKYUを用いた記載とその成果
森下知晃, KELEMEN B. Peter, COGGON Judith, MATTER Juerg, HARRIS Michelle, 道林克禎, 高澤栄一, TEAGLE A.H. Damon, GODARD Marguerite
日本鉱物科学会年会講演要旨(Web) 2018
ボニナイトと前弧玄武岩のマグマ混合:IODP第352次航海にて小笠原沖前弧域から採取された岩石試料の分析結果
柵山徹也, 木村純一, 高橋俊郎, 田村芳彦, 高澤栄一, 吉田健太
日本火山学会講演予稿集 2017.9
オマーンマントルかんらん岩からみた初期島弧マントルの酸化還元状態とフラックス溶融との関係
高澤栄一, 高澤栄一, 谷雅史, 田村芳彦
日本鉱物科学会年会講演要旨(Web) 2017
オマーンオフィオライト南部Wadi Tayin岩体マントルセクションの岩石学的研究―特に島弧火成活動の影響について―
石井慶佑, 高澤栄一, 高澤栄一, 田村芳彦
日本鉱物科学会年会講演要旨(Web) 2017
道林克禎, 高澤栄一, 田村芳彦, 小原泰彦, 岡本敦, 森下知晃, 石塚治, 針金由美子, 藤江剛, 片山郁夫, 渡邊了
ブルーアース要旨集 2017
オマーンオフィオライトのマントルかんらん岩から推測されるマントルウェッジの酸化還元状態
高澤栄一, 高澤栄一, 谷雅史, SATISH‐KUMAR Madhusoodhan, 赤坂正秀, 田村芳彦
日本鉱物科学会年会講演要旨集 2016.9
オマーンオフィオライトのメタモルフィックソールの原岩としてのHaybi火山岩類の地球化学的検証
坂下雅, 森菜美子, 高澤栄一, 野原里華子, 高橋俊郎, 田村芳彦
日本地球惑星科学連合大会予稿集(Web) 2016
高澤栄一, 高澤栄一, 田村芳彦, 道林克禎, 森下知晃, 阿部なつ江, 宮崎隆, 仙田量子, KYAWTHU Moe
日本地球惑星科学連合大会予稿集(Web) 2016
オマーンオフィオライト・フィズ岩体マントルセクションの酸化還元状態:マントルウェッジのアナログ研究
谷雅史, 高澤栄一, 高澤栄一, SATISH‐KUMAR Madhusoodhan, 赤坂正秀, 田村芳彦
日本地球惑星科学連合大会予稿集(Web) 2016
オマーンオフィオライトFizh岩体北部における蛇紋岩化プロセスの推定
吉田有希, 高澤栄一, 植田勇人, 田村芳彦
日本地球惑星科学連合大会予稿集(Web) 2016
北海道幌満かんらん岩体の上部マントルから下部地殻への上昇過程における部分溶融の可能性
篠原彩奈, 高澤栄一, 高澤栄一
日本鉱物科学会年会講演要旨集 2015.9
オマーンオフィオライト基底部にみる沈み込みスラブからマントルウェッジへの流体の浸透とフラックス溶融
高澤栄一, 高澤栄一, 山下千晶, 吉田有希, 田村芳彦
日本鉱物科学会年会講演要旨集 2015.9
井澤一輝, 高澤栄一
日本地質学会学術大会講演要旨 2015.9
オマーンオフィオライト北部・サラヒ岩体最南部地域のマントルセクションにおけるかんらん岩類の空間的組成変化と産状の対応関係
藤井悟, 高澤栄一
日本地質学会学術大会講演要旨 2014.9
北部オマーンオフィオライトのメタモルフィックソールにおける接触変成作用の特徴と含水溶融の可能性
森菜美子, 高澤栄一, 野原里華子, 足立佳子, 高橋俊郎, 宮下純夫
日本地質学会学術大会講演要旨 2014.9
北部オマーンオフィオライト・基底かんらん岩の溶融プロセスとメルト/流体反応
野本有希, 高澤栄一
日本鉱物科学会年会講演要旨集 2014.9
オマーンオフィオライト北部・サラヒ岩体最南部地域のマントルセクションにおける鉱物組成の広域的分布から推定されるメルト流動の多様性
藤井悟, 高澤栄一
日本地質学会学術大会講演要旨 2013.9
北部オマーンオフィオライトマントルセクションからみたマントル再溶融とボニナイト質メルト形成場の多様性
高澤栄一, 菅家奈未, 野本有希, 藤井悟
日本地質学会学術大会講演要旨 2013.9
海洋リソスフェア衝上に伴うマントル‐流体反応プロセス:オマーンオフィオライト・サラヒマントルセクション基底かんらん岩の例
野本有希, 高澤栄一
日本地質学会学術大会講演要旨 2013.9
オマーンオフィオライト・フィズ岩体のマントルセクションに分布する二種類のダナイトについて
末武杏奈, 高澤栄一
日本地質学会学術大会講演要旨 2011.9
オマーンオフィオライト北部・ヒルチ岩体の鉱物組成分布からみた海洋リソスフェアマントルの変遷
高澤栄一, 春日良一, 山野井陽一
日本地質学会学術大会講演要旨 2011.9
オマーンオフィオライト北部フィズ岩体のメタモルフィックソールにおける接触変成作用
森菜美子, 高澤栄一
日本地質学会学術大会講演要旨 2011.9
オマーンオフィオライトフィズ岩体マントルセクションに分布するダナイトの広域的組成変化と成因に関する岩石学的研究
末武杏奈, 高澤栄一
日本地質学会学術大会講演要旨 2010.9
メルト‐マントル反応による未分化マントル再生過程の検討:日高変成帯幌満かんらん岩体の例
高澤栄一, 吉田和弘
日本地質学会学術大会講演要旨 2010.9
オマーンオフィオライトマントルセクションにおける苦鉄質‐超苦鉄質ダイクの多様性と起源
金澤晋太郎, 高澤栄一
日本地質学会学術大会講演要旨 2009.9
海洋リソスフェアマントルの形成と進化:オマーンオフィオライト・フィズ岩体の例
高澤栄一, 村上龍太朗, 金澤晋太郎, 佐藤力樹
日本地質学会学術大会講演要旨 2009.9
オマーンオフィオライトFizh岩体北端部におけるマントルセクションのカンラン岩と苦鉄質・超苦鉄質ダイクの組成関係
佐藤力樹, 高澤栄一
日本地質学会学術大会講演要旨 2009.9
オマーンオフィオライト・南部フィズ岩体マントルセクションにおけるマントル‐メルト反応の空間変化
村上龍太朗, 高澤栄一, 菅家奈未
日本地質学会学術大会講演要旨 2008.9
マントルの構造敏感性,地震波特性,そして物質移動 オマーンオフィオライト・フィズ岩体の海嶺セグメント構造とマントルセクションの組成変化
村上龍太朗, 菅家奈未, 高澤栄一
月刊地球 2008.4
オマーンオフィオライトマントルセクションにおける高枯渇帯の分布と苦鉄質ダイクの多様性
高澤栄一, 村上龍太朗, 木村純一
日本地質学会学術大会講演要旨 2007.9
荒井章司, 新井田清信, 阿部なつ江, 高澤栄一
日本地質学会学術大会講演要旨 2007.9
Arai S, Niida K, Abe N, Takazawa E
日本地質学会学術大会講演要旨 2007.9
オマーンオフィオライトマントルセクションの高枯渇かんらん岩と不適合元素の分布―海洋リソスフェリックマントルにおける流体移動と反応の証拠―
高澤栄一, 菅家奈未
日本地質学会学術大会講演要旨 2006.9
Melt channel and melt-mantle reaction near the 15°20" Fracture Zone, the Mid-Atlantic Ridge
Takazawa Eiichi, Abe Natsue
Annual Meeting of the Geological Society of Japan 2005
Petrological insights of abyssal peridotite from ODP Leg209 "MAR Peridotite"
ABE Natsue, TAKAZAWA Eiichi, KIKAWA Eiichi, MORISHITA Tomoaki
日本鉱物学会・学術講演会,日本岩石鉱物鉱床学会学術講演会講演要旨集 2004.9
P-211 Hybridization of dunite and gabbroic materials observed in Hole 1271B, ODP Leg 209
Takazawa Eiichi, Abe Natsue, Kikawa Eiichi
Annual Meeting of the Geological Society of Japan 2004
Takazawa Eiichi, Takagi Takashi
Annual Meeting of the Geological Society of Japan 2003
Michibayashi K, Takazawa E, Okayasu F
Annual Meeting of the Geological Society of Japan 2001
Takazawa Eiichi, Okayasu Toshie
Annual Meeting of the Geological Society of Japan 2001
Furuta Kozue, Takazawa Eiichi, Miyashita Sumio
Annual Meeting of the Geological Society of Japan 2000
Anatexis of the Upper Zone of the Horoman ultramafic massif from the Hidaka Metamoriphic Belt
Takazawa Eiichi
Annual Meeting of the Geological Society of Japan 1989
Obata M, Takazawa E, Takahashi N
SECOND SERIES BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 1988
248 Petrochemistry of ultramafic rocks in the Hidaka Metamorphic Belt
NIIDA Kiyoaki, TAKAZAWA Eiichi, YOSHIKAWA Masako
Annual Meeting of the Geological Society of Japan 1988
Takazawa Eiichi
Annual Meeting of the Geological Society of Japan 1988
Core-Log Integration across Crust-Mantle Transition in Oman International conference
Moe, K, Yamada, Y, Matter, J.M, Abe, N, Takazawa, E
AGU Fall Meeting 2018
Paper Award
2021.9 Japan Association of Mineralogical Sciences Yao, Y., Takazawa, E., Chatterjee, S., Richard, A., Morlot, C., Créon, L., Al–Busaidi, S., Michibayashi, K., Oman Drilling Project Science Team (2020) High resolution X–ray computed tomography and scanning electron microscopy studies of multiphase solid inclusions in Oman podiform chromitite: implications for post–entrapment modification. Journal of Mineralogical and Petrological Sciences, 115, 247–260.
Eiichi Takazawa, Katsuyoshi Michibayashi
Clarification of alteration of the upper mantle in the mid-ocean ridge and subduction zone
Grant number：20H02005
2020.4 - 2025.3
System name：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
Research category：Grant-in-Aid for Scientific Research (B)
Awarding organization：Japan Society for the Promotion of Science
Authorship：Principal investigator
Grant amount：\17550000 （ Direct Cost: \13500000 、 Indirect Cost：\4050000 ）
Physical properties of uppermost mantle structure and the Mohorovicic seismic discontinuity
Grant number：16H06347
2016.5 - 2021.3
System name：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)
Research category：Grant-in-Aid for Scientific Research (S)
Awarding organization：Japan Society for the Promotion of Science
Michibayashi Katsuyoshi
Grant amount：\184210000 （ Direct Cost: \141700000 、 Indirect Cost：\42510000 ）
In order to clarify the structure of the uppermost mantle and the formation process of the Mohorovicic discontinuity (Moho), which is the crust-mantle boundary, this study was carried out using a multifaceted approach, including microstructural analysis, measurements of physical properties, and rock-water reaction experiments, mainly on marine and terrestrial peridotites. We confirmed that the microstructure of peridotite at depths of 6,000 m or more in the Ogasawara Trench has been affected by water, and elucidated the new dynamics of deep fluids involved in rock-water reactions. We drilled the Oman ophiolite body in the Arabian Peninsula and successfully recovered continuous samples of crustal to mantle materials, and their analyses provided numerous insights for quantitative understanding of rock-fluid reaction processes in oceanic plates. Based on these results, we have developed a new model for the formation of the Moho surface and a model for the uppermost mantle structure.
Elucidations of the physical properties and actual condition of the crust-mantle boundary (Moho) by onshore drilling of the Oman Ophiolite
Grant number：16H02742
2016.4 - 2020.3
System name：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
Research category：Grant-in-Aid for Scientific Research (A)
Awarding organization：Japan Society for the Promotion of Science
TAKAZAWA Eiichi
Authorship：Principal investigator Grant type：Competitive
Grant amount：\45110000 （ Direct Cost: \34700000 、 Indirect Cost：\10410000 ）
We participated in the International Continental Scientific Drilling Program (ICDP) Oman drilling project and carried out onshore drilling of the crust-mantle boundary in the Oman ophiolite. In the Holes CM1A and CM2B of Wadi Tayin massif, we succeeded in completely collecting the drilling core with a recovery rate of 100%. As a result of drilling, it was revealed that there is a 150m thick lithology mainly composed of dunite at the boundary between the crust and the mantle. From the depth variation of whole rock and mineral science composition, it was found that the process of formation of dunite by the reaction of harzburgite and basaltic melt is recorded. Moreover, from the physical analysis of the core, the seismic velocity of the mantle that has undergone serpentinization is much lower than that of the lower crust.
Redox state of mantle wedge inferred from the mantle section of the Oman ophiolite
Grant number：26610173
2014.4 - 2017.3
System name：Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research
Research category：Grant-in-Aid for Challenging Exploratory Research
Awarding organization：Japan Society for the Promotion of Science
Takazawa Eiichi, SATISH-KUMAR M, AKASAKA Masahide
Authorship：Principal investigator Grant type：Competitive
Grant amount：\3770000 （ Direct Cost: \2900000 、 Indirect Cost：\870000 ）
We studied the spatial distribution of oxygen fugacity in the Fizh mantle section of the northern Oman ophiolite as an analog for the redox state of mantle wedge. The delta log fO2 relative to FMQ buffer of harzburgites and dunites were calculated following the method of Ballhaus et al. (1991). The values range from FMQ-3.3 to +1.8 and tend to decrease from the crust-mantle boundary (Moho) to the basal part of the mantle section. Dunites are more oxidized than harzburgites. The Fe3+/∑Fe ratio of spinel were evaluated by Mossbauer spectroscopy. The difference is negligible compared to the whole range. The V/Sc and Zn/Fe ratios of whole rock peridotites show a strong negative and positive correlations with delta log fO2 (FMQ), respectively, indicating the observed variation and tendency of delta log fO2 (FMQ) are consistent with residues formed by flux melting of mantle section with a reduced melt/fluid derived from subducted sediment.
初期島弧における海洋リソスフェアの再融解とボニナイトの生成に関する地質学的検証
2007.4 - 2010.3
System name：科学研究費 基盤研究 (C)
Awarding organization：日本学術振興会
高澤 栄一
Authorship：Principal investigator Grant type：Competitive
Grant amount：\4550000 （ Direct Cost: \3500000 、 Indirect Cost：\1050000 ）
オマーンオフィオライト北部に位置するフィズ岩体マントルセクションに分布するかんらん岩類と貫入岩類の構造と化学組成を分析し、中央海嶺における海洋リソスフェアの形成から海洋デタッチメントによる初期島弧での改変のプロセスを明らかにした。とくに融け残りかんらん岩の組成分布から海嶺セグメント構造が見いだされた。海嶺セグメント境界には高枯渇のハルツバージャイトとダナイトが分布し,海洋リソスフェアのデタッチメントに伴い,多量の流体が流動したことが明らかになった。
Comparative study of oceanic plate and ophiolite based on accurate analyses of crustal and mantle material
Grant number：17340162
2005 - 2007
System name：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
Research category：Grant-in-Aid for Scientific Research (B)
Awarding organization：Japan Society for the Promotion of Science
MIYASHITA Sumio, TAKAZAWA Eiichi, MAEDA Jin-ichiro
Grant amount：\15700000 （ Direct Cost: \14800000 、 Indirect Cost：\900000 ）
The results obtained from this research project are summarized as follows.
Systematic mineral and bulk rock analyses for mantle harzburgites sampled from extensive area of the northern Oman ophiolite indicate that a highly depleted zone is present within the mantle section. The depleted zone is defined by the appearance of Cr-spinels with high Cr# (Cr/(Cr+Al), and traced along the shear zone trending NW-SE described by French group. Remelting of mantle sections caused by invasion of fluids expelled from the underling basement during oceanic thrusting movement would bring a such depleted zone.
We have examined a regional variation of the mantle-crust transition zone. Lithologic column obtained from7 routes, located at different locations in a segment architecture, indicate a systematic variation of the mantle-crust transition zone depending on the segment structure, as follows. The thickness of the transition zone thickens toward the segment center, and become to thin at the segment margin. However, abnormally thick transition zone was found from the northern tribute branch of Wadi Fizh, locating at the most margin of the segment. Systematic variations in structural features in the transition zone are also obvious, that is, intensive lineation and foliation are well observed at the segment center, while they are only poorly developed at the segment margin. These results suggest that mantle upwelling and magmatic flowage were more vigorous at the segment center. Also lithologic column for extrusive successions are studied at different localities in terms of segment structure. Systematic variations in respect to mode of occurrence of the extrusives were found, as follows: Massive flows are predominant at the segment center with numerous numbers of unit. Whereas, pillow lavas are predominant at the segment margin and are characterized by much thicker unit than the segment center. Thus, both extrusives in the uppermost level, and deeper section of the crust, were controlled by segmentation structure.
Geological Study of Partial Melting of Mafic Rock-Bearing Heterogeneous Upper Mantle
Grant number：16540413
2004.4 - 2006.3
System name：Grant-in-Aid for Scientific Research (C)
Research category：Grant-in-Aid for Scientific Research (C)
Awarding organization：Japan Society for the Promotion of Science
TAKAZAWA Eiichi
Authorship：Principal investigator Grant type：Competitive
Grant amount：\3400000 （ Direct Cost: \3400000 ）
This research investigated the partial melting and mantle-melt reaction occurred in the Horoman peridotite on the basis of field occurrence and major and trace element abudances in mafic rocks. As a result of study, Type I mafic granulite of the Horoman peridotite were experienced remelting event about 80 million years ago. The center of the mafic layer may have been garnet clinopyroxenite while the margin was a primitive melt in equilibrium with the center in terms of trace elements. Both are now metamorphosed into mafic granulite during uplifting of the Horoman peridotite.
Following this study, I investigated the mantle section of the Oman ophiolite in 2004-2005 to understand formation of chemical heterogeneity by partial melting of oceanic upper mantle. Detailed analysis of mineral compositions of peridotite samples revealed the presence of highly refractory peridotite zone that obliquely crosscuts the mantle section parallel to the low temperature shear zone. It is advocated that the refractory zone formed by remelting of harzburgite due to reduction of solidus temperature as a result of fluid flow along shear zone.
Third, heterogeneity of oceanic upper mantle was directly examined using peridotite samples drilled at Mid-Atlantic Ridge in 14°N〜16°N during ODP Leg 209. Optical investigation under microscope and analysis of mineral compositions for drilled cores from Hole B, Site 1271showed that melt flow and mantle-melt reaction in shallowest upper mantle produced a series of lithologies such as impregnated dunite, olivine gabbro, gabbronorite and troctolite as hybrid rocks between dunite and mafic melt.
Geological Study of Partial Melting of Mafic Rock-Bearing Heterogeneous Upper Mantle
Grant number：16540413
2004 - 2005
System name：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
Research category：Grant-in-Aid for Scientific Research (C)
Awarding organization：Japan Society for the Promotion of Science
TAKAZAWA Eiichi
Grant amount：\3400000 （ Direct Cost: \3400000 ）
This research investigated the partial melting and mantle-melt reaction occurred in the Horoman peridotite on the basis of field occurrence and major and trace element abudances in mafic rocks. As a result of study, Type I mafic granulite of the Horoman peridotite were experienced remelting event about 80 million years ago. The center of the mafic layer may have been garnet clinopyroxenite while the margin was a primitive melt in equilibrium with the center in terms of trace elements. Both are now metamorphosed into mafic granulite during uplifting of the Horoman peridotite.
Following this study, I investigated the mantle section of the Oman ophiolite in 2004-2005 to understand formation of chemical heterogeneity by partial melting of oceanic upper mantle. Detailed analysis of mineral compositions of peridotite samples revealed the presence of highly refractory peridotite zone that obliquely crosscuts the mantle section parallel to the low temperature shear zone. It is advocated that the refractory zone formed by remelting of harzburgite due to reduction of solidus temperature as a result of fluid flow along shear zone.
Third, heterogeneity of oceanic upper mantle was directly examined using peridotite samples drilled at Mid-Atlantic Ridge in 14°N〜16°N during ODP Leg 209. Optical investigation under microscope and analysis of mineral compositions for drilled cores from Hole B, Site 1271showed that melt flow and mantle-melt reaction in shallowest upper mantle produced a series of lithologies such as impregnated dunite, olivine gabbro, gabbronorite and troctolite as hybrid rocks between dunite and mafic melt.
Geological study of interaction between lithospheric mantle and asthenosphere
Grant number：14540421
2003.4 - 2005.3
System name：Grant-in-Aid for Scientific Research (C)
Research category：Grant-in-Aid for Scientific Research (C)
Awarding organization：Japan Society for the Promotion of Science
TAKAZAWA Eiichi
Authorship：Principal investigator Grant type：Competitive
Grant amount：\4100000 （ Direct Cost: \4100000 ）
This research investigated the mantle-melt reaction that occurs at Earth's extensional environments such as continental rift and mid-ocean ridge. The studied fields includes the Horoman peridotite complex in the Hidaka Metamorphic Belt, Hokkaido, Japan and the mantle section of the Oman ophiolite. On the basis of spatial variation of trace elements such as rare earth elements in the mantle peridotites and in their constituent minerals the reaction between lithospheric mantle and ascending asthenospheric melt was quantitatively modeled. The study showed that the Horoman peridotite are highly heterogeneous in a meter scale so that even in the 140 meters section fertile Iherzolite with primitive mantle composition and depleted harzburgite are observed. The variation of incompatible elements are further complicated thereby showing the metasomatism by asthenospheric melt flow. On the other hand, the mantle section of the Oman ophiolite are more homogeneous in the scale of ten kilo meters. Abundances of major and trace element in the area of 25 x 15km^2 in the Oman mantle section are less variable than those in the 140m section of the Horoman peridotite. Compositional variations in the mantle section of the Oman ophiolite are mainly explained by partial melting and melt extraction beneath mid-ocean ridge. However, this research found greater variations in the Oman ophiolite than it has been known before. These heterogeneities may have formed by remelting and refertilization of oceanic lithospheric mantle in a scale of km.
Geological study of interaction between lithospheric mantle and asthenosphere
Grant number：14540421
2002 - 2003
System name：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)
Research category：Grant-in-Aid for Scientific Research (C)
Awarding organization：Japan Society for the Promotion of Science
TAKAZAWA Eiichi
Grant amount：\4100000 （ Direct Cost: \4100000 ）
This research investigated the mantle-melt reaction that occurs at Earth's extensional environments such as continental rift and mid-ocean ridge. The studied fields includes the Horoman peridotite complex in the Hidaka Metamorphic Belt, Hokkaido, Japan and the mantle section of the Oman ophiolite. On the basis of spatial variation of trace elements such as rare earth elements in the mantle peridotites and in their constituent minerals the reaction between lithospheric mantle and ascending asthenospheric melt was quantitatively modeled. The study showed that the Horoman peridotite are highly heterogeneous in a meter scale so that even in the 140 meters section fertile Iherzolite with primitive mantle composition and depleted harzburgite are observed. The variation of incompatible elements are further complicated thereby showing the metasomatism by asthenospheric melt flow. On the other hand, the mantle section of the Oman ophiolite are more homogeneous in the scale of ten kilo meters. Abundances of major and trace element in the area of 25 x 15km^2 in the Oman mantle section are less variable than those in the 140m section of the Horoman peridotite. Compositional variations in the mantle section of the Oman ophiolite are mainly explained by partial melting and melt extraction beneath mid-ocean ridge. However, this research found greater variations in the Oman ophiolite than it has been known before. These heterogeneities may have formed by remelting and refertilization of oceanic lithospheric mantle in a scale of km.
かんらん岩からマントルプロセスを読む-新たな展開と第4回国際レルゾライト会議をめざして
Grant number：13894015
2001
System name：科学研究費助成事業 基盤研究(C)
Research category：基盤研究(C)
Awarding organization：日本学術振興会
小畑 正明, 小澤 一仁, 新井田 清信, 荒井 章司, 高橋 奈津子, 高澤 栄一
Grant amount：\3400000 （ Direct Cost: \3400000 ）
2001年7月21日から25日にわたって,北海道様似町の様似町公民館及びアポイ山荘会議室にてシンポジウム「かんらん岩とマントルプロセス」を開催した.本集会は2002年8-9月北海道様似町で開催予定の第4回国際ワークショップ「造山帯レルゾライトとマントルプロセス」に向けて国内の準備体制を強化し,国内の研究をより一層推進するためのものであった.21日,22日及び23日の夜間は室内講演会,討論会を行った.また23日,24日は幌満かんらん岩の野外地質巡検を実施した.全国の大学から教官21名,学生,院生11名の計32名が参加し,室内討論会では19編の口頭発表と7編のポスターの発表がなされた.カバーしたテーマは岩石学,構造地質学・実験岩石学・微量元素・同位体地球化学,地球物理学,など多方面にわたり,短期間であったが集中的な討議ができた.野外地質巡検では,2002年の本会議の時の巡検予定コースを実地に検討することで幌満かんらん岩の研究の最前線を野外で検証し知識を参加者間で共有する事ができた.25日は関係者で準備委員会を行い,様似町側と詳細な準備打ち合わせを行った.なお本シンポジウムで発表された講演の要旨は別に冊子にまとめ参加者,関係者に配布するべく3月現在準備中である.
9月下旬には金沢において準備委員会を開催し,本会議のセカンドサーキュラーの骨子を作成,その後関係者間で協議を続けることにより,11月にセコンドサーキュラーを完成させweb上で公開するとともに,世界に配布した・またこの間海外の組織科学プログラムメンバーとも意見を交わし,会議のプロシーディングをJ.Petrolgyに出すこと,またそのゲストエディターのメンバーを決定し2002年の国際会議に向けて準備を大きく進めることができた.
Generation and reorganization of Oman oceanic crust-mantle
Grant number：11691121
1999 - 2000
System name：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A).
Research category：Grant-in-Aid for Scientific Research (A).
Awarding organization：Japan Society for the Promotion of Science
ARAI Shoji, UMINO Susumu, TAKAZAWA Eiichi, MIYASHITA Sumio, MIZUTA Toshio, MASUDA Toshiaki
Grant amount：\20000000 （ Direct Cost: \20000000 ）
1. We recognized a wide petrographical variation of peridotite, its deformational history, cystallographical change of minerals and origin of mylonites within the upper mantle section of the northern Oman ophiolite. High-PGE chromitite was also discovered.
2. We classified the late-intrusive rocks into three types in terms of petrography. Komatititic extrusives were found associated with picrite basalt, a quench phase of the late intrusives.
3. The segmetation structure of a mid-ocean ridge was estimated by the strutural change of gabbroic layers. Noritic gabbro intruding around the derivative magma chmabers around the segment center impose contact metamorphism of up to granulite facies on surrounding sheeted dike complex. The structure and evolutional history of the roof zone of magma chambers were clarified.
4. The upper lavas can be classified into three groups by high-accuracy chemical analysis of their Cpx phenocrysts, and the genesis was estimated for individual groups. Boninite was newly found. Preliminary data on the Salahi volcanics that erupted at the obuduction stage were presented.
5. Hysrothermal metal mineralization was geologically and geochemically examined to understand its genesis. Reaction between aqueous fluid and chlorite in meta-basalts is of vital importance for their characteristics of Zn and Ni contents. The water/rock ratio in the hydrothermal fluid formation is around 20, that is far higher than the calculated values, 2 to 4.
6. The thermal structure of the ocean-floor metamorphism was examined in basalt to dolerite to confirm a temprature increase downward.
7. The shear sense on the metamorphic sole is NE-SW and the hanging side was confirmed to have moved toward SW.The basic amphibolite of the sole demonstrates variable flow textures within several tens of meters from the contact with overlying ultramafic rocks.
PRIMARY FORMATION AGES AND CIRCUMUSTANCES OF PRECRETACEOUS ROCKS MAKING UP THE RYOKE BELT IN HONSHU ARC
Grant number：10440139
1998 - 2000
System name：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B).
Research category：Grant-in-Aid for Scientific Research (B).
Awarding organization：Japan Society for the Promotion of Science
KAGAMI Hiroo, SHIMURA Toshiaki, TAKASAWA Eiichi, KOBAYASHI Kenta, TAINOSHO Yoshiaki, TOYOSHIMA Tsuyoshi
Grant amount：\13000000 （ Direct Cost: \13000000 ）
Crustal evolution of the Ryoke Belt is as follows ; (1) 2000-1800Ma.Granitic upper crust was formed from depleted mantle-origin lower crust, which is a primitive basement of the Ryoke Belt. These age data were obtained from Nd model ages of sedimentary-origin metamorphic rocks and granites, which were calculated using depleted mantle parameters, and U-Pb zircons contained in Cretaceous Ryoke granites and Jurassic mafic rocks. (2) 1750-1600Ma. Ceologic events of this age range are not clear. These age data were obtained from Nd model calculations of sedimentary-origin metamorphic rocks and granites. (3)220-190Ma. Mafic volcanism and plutonism took place under continental circumustances. These magmas were derived from continental lithospheric mantle. Age data of this range were measured using Sm-Nd whole rock isochron and whole rock-mineral isochron of gabbros and metadiabases. (4) 170-160Ma. Some mafic to intermediate rocks were formed during this age range. Age data of this range were obtained from Sm-Nd and Rb-Sr whole rock isochrons and Sm-Nd whole rock-mineral isochron. (5) 125-70Ma. Voluminous felsic igneous activity took place during this age ranges under island arc and continental margin circumustances. These age data were obtained from Rb-Sr whole rock isochron. Sm-Nd and Rb-Sr whole rock-mineral isochronos. As initial Sr and Nd isotopic compositions of these rocks are the same as the 220-190Ma mafic rocks, the felsic magmas are considered to have derived from the continental lithosphere lower crust and upper mantle.
The Cretaceous to Paleogene igneous rocks showing the same isotopic features with Ryoke felsic igneous rocks are widely distributed in the Honshu Arc, which means that the Ryoke-type continental lithosphere basically made up the Honshu Arc.
Geodynamics of generation of oceanic crust-an example of the Oman ophiolite
Grant number：09041101
1997 - 1998
System name：Grants-in-Aid for Scientific Research Grant-in-Aid for international Scientific Research
Research category：Grant-in-Aid for international Scientific Research
Awarding organization：Japan Society for the Promotion of Science
MIYASHITA Sumio, TAKAZAWA Eiichi, ISHIKAWA Tsuyoshi, UMINO Susumu
Grant amount：\17700000 （ Direct Cost: \17700000 ）
The results obtained from this research project are summarized for each group.
Mantle group clarified an interaction between melt and mantle in the mantle-crust transition zone. Also they round the interaction was quite hetrogenous palce to place. Analyses of spinel using river sand show that the mantle peridotites of the Oman ophiolite are highly depleted compared to oceanic mantle, suggesting that signiricant modification or the mantle peridotite occured during later island arc stage.
Gabbro group round two series of gabbros previously regarded as successive complex, which were formed at advancing and dying magma chambers beneath ocean ridges, respectively. This is explained by overlapping ocean ridges where propagation and retreating or ridges appeared. The central part of ridge segment where thick Moho transition zone occurs was determined through regional detailed geological mapping in the northern Oman ophiolite. From the central part to the tip or ridge segmenl, mineral compositions or layered gabbro varies systematically from less evolved to more evolved compositions.
Upper crust group measured direction and thickness of dikes from extensive area in the northern Oman ophiolite. They found that the direction of dikes varies for each several km length, indicating the smallest order of segmentation of ocean ridges. The thickness of dikes increases from the central part to tip of the ridge segment in more large scale which is presumed from the petrological features of gabbro and mantle peridotite.
Structural group found two different mineral lineations on foliation plane in the metamorphic sole beneath the Oman ophiolite. Also they clarified that the degree of preferred orientation is quite various even in one outcrop.
Earth Science todayI
佐渡学概論:佐渡島の自然と人々の営み
海外フィールド科学実習A
海外フィールド体験実習
海外フィールド科学実習B
地球環境フィールド科学演習
フィールド産業インターンシップ
地球環境科学特論
理学基礎演習
基礎英語コミュニケーション
理学スタディ・スキルズ
実践英語コミュニケーション
地球深部物質論
台湾スプリングセミナー I
台湾スプリングセミナー II
地球科学特別講義I
野外実習I
課題研究(地質科学)
論文講読演習
専門力アクティブ・ラーニング
先端科学技術総論
自然科学総論Ⅴ
地質調査法実習III
岩石学C
野外実習A
野外実習B
鉱物・岩石学入門
理学スタディ・スキルズ
地質学入門a
地学基礎実習a
フィールド体験実習
総合力アクティブ・ラーニング
Earth Science todayⅡ
地学基礎実習b
岩石学実験II
論文作成演習D
地球科学特別講義III
地球科学特定研究Db
岩石学実験I
台湾スプリングセミナー I
台湾スプリングセミナー II
地球科学特定研究Dc
学術発表演習D
中間発表D
グローバルミーティング
プロジェクト研究特別概説
リサーチインターンシップ
課題研究(地質科学科)
学術発表演習M
地球科学特定研究Ma
地球科学演習D
地球科学演習Ma
地球科学特定研究Mb
地球科学演習Mb
中間発表M
地球科学特定研究Da
海洋地質学
リサーチキャンプ
海洋地殻生成論
自然構造科学演習MⅠ
論文作成演習M
自然構造科学特定研究MⅠ
岩石学A
セミナー
岩石学B
課題研究
地球物理学
野外実習III
海底地質学
地質調査法II
地質調査法I
地質調査法実習II
地質調査法実習I
マントル・地殻ダイナミクス
地球化学分析法
地学概論A
野外実習I
地史学原理
地球深部物質論
野外実習II
地学実験C
スタディ・スキルズ(地質科学学習法)
固体地球化学
鉱物学A
鉱物学B
生きている地球
