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Eiichi Takahashi

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Eiichi Takahashi
BornNovember 1951 (age 73)
Hamamatsu, Japan
NationalityJapanese
Occupation(s)Geoscientist and academic
Academic background
EducationBS., Geophysics
MS., Petrology
PhD., Petrology
Alma materUniversity of Tokyo
Academic work
InstitutionsGuangzhou Institute of Geochemistry, Chinese Academy of Sciences

Eiichi Takahashi is a Japanese geoscientist and academic. He is a research professor at the Guangzhou Institute of Geochemistry, Chinese Academy of Sciences.

Takahashi's research encompasses high-pressure experiments and the study of mantle and volcanic rocks to investigate magma genesis, deep mantle processes, and mineral phase transitions. He is a union fellow of the American Geophysical Union and was awarded the F.W. Clarke Medal from the Geochemical Society in 1987, as well as the Japan Medal of Honor with Purple Ribbon in 2018.

Education

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Takahashi earned a B.S. in Geophysics in 1974, followed by an M.S. in Petrology in 1976, and a Ph.D. in Petrology in 1979, all from the University of Tokyo.[1]

Career

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Takahashi began his academic career as a post-doctoral fellow at the Geophysical Laboratory, Carnegie Institute of Washington, in 1979, and he became an assistant professor at Okayama University in 1981. He joined the Tokyo Institute of Technology as an associate professor in 1988 and was later appointed professor in 1994, a role he held until 2017.[1] During this time, he was also a center leader of the 21st Century COE "How to build a habitable planet?" of MEXT (the Ministry of Education, Culture, Sports, Science and Technology)[2] from 2004 to 2008[1] and area representative for a research grant on geofluids from 2009 to 2013.[3] Subsequently, from 2013 to 2017, he directed the Tokyo Institute of Technology Library.[4] Since 2017, he has been a research professor at the Guangzhou Institute of Geochemistry, Chinese Academy of Sciences.[5]

Research

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Takahashi has carried out studies on volcanic rocks and the mantle. His experimental research on high-pressure partial melting of spinel lherzolite with Ikuo Kushiro has documented melt compositions at 1 GPa and recorded variations in elements like FeO and MgO.[6][7] He extended the melting study of mantle peridotite to higher pressures using a multi-anvil setup and analyzed the melting of peridotite KLB-1 up to 20 GPa, identifying phase relations, compositions of melts, and solid residues.[8] Based on this work, he discussed the origin of the Archean komatiite magma and proposed melting peridotite in the upper mantle or transition regions.[9] Together with Eiji Ito, he showed that the postspinel transition in Mg2SiO4–Fe2SiO4 occurs across a narrow range of pressure at 1600 °C, emphasizing the idea that this abrupt transformation is the cause of seismic discontinuity at 670 km depth.[10][11] He noted that peridotite xenoliths from the southwestern Japan arc have higher equilibrium temperatures compared to those from the northeastern Japan arc.[12]

Takahashi headed a team of scientists that conducted a research project to study the underwater part of the Hawaiian volcanoes by using submersibles. The outcomes of this work were published in Hawaiian Volcanoes: Deep Underwater Perspectives, which was recognized as the best book in geography and earth science by the Association of American Publishers in 2002.[13]

In a collaborative study, Takahashi found small alkalic volcanoes, petit spots, on the Pacific Plate formed by small asthenospheric melts that rise through flexure-induced fractures in 95 km-thick lithosphere.[14] His work contended that ocean island basalts are from fertile mantle and not hot mantle,[15] and suggested that Columbia River Basalts are produced by high-degree melting of recycled oceanic crust with pyroxenite lithologies within an inhomogeneous plume head, and pooling and eruption of the melts as large basaltic flows.[16]

Awards and honors

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  • 1987 – Geochemical Society F.W. Clarke Medal[17]
  • 2015 – Volcanological Society of Japan Award[18]
  • 2016 – American Geophysical Union Fellow[19]
  • 2018 – Japan Geoscience Union Fellow[20]
  • 2018 – Medal with Purple Ribbon[21]

Selected articles

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  • Takahashi, Eiichi; Kushiro, Ikuo (1983). "Melting of a dry peridotite at high pressures and basalt magma genesis". American Mineralogist. 68 (9–10): 859–879.
  • Takahashi, Eiichi (1986). "Melting of a dry peridotite KLB-1 up to 14 GPa: Implications on the origin of peridotitic upper mantle". Journal of Geophysical Research: Solid Earth. 91 (B9): 9367–9382. Bibcode:1986JGR....91.9367T. doi:10.1029/JB091iB09p09367.
  • Ito, Eiji; Takahashi, Eiichi (1989). "Postspinel transformations in the system Mg₂SiO₄–Fe₂SiO₄ and some geophysical implications". Journal of Geophysical Research: Solid Earth. 94 (B8): 10637–10646. doi:10.1029/JB094iB08p10637.
  • Takahashi, Eiichi; Nakajima, Katsuji; Wright, Thomas L. (1998). "Origin of the Columbia River basalts: melting model of a heterogeneous plume head". Earth and Planetary Science Letters. 162 (1–4): 63–80. Bibcode:1998E&PSL.162...63T. doi:10.1016/S0012-821X(98)00157-5.
  • Kogiso, Tetsu; Hirose, Kei; Takahashi, Eiichi (1998). "Melting experiments on homogeneous mixtures of peridotite and basalt: application to the genesis of ocean island basalts". Earth and Planetary Science Letters. 162 (1–4): 45–61. Bibcode:1998E&PSL.162...45K. doi:10.1016/S0012-821X(98)00156-3.
  • Hirano, Naoto; Takahashi, Eiichi; Yamamoto, Junji; Abe, Natsue; Ingle, Stephanie P.; Kaneoka, Ichiro; Hirata, Takafumi; Kimura, Jun-Ichi; Ishii, Teruaki; Ogawa, Yujiro; Machida, Shiki; Suyehiro, Kiyoshi (2006). "Volcanism in Response to Plate Flexure". Science. 313 (5792): 1426–1428. Bibcode:2006Sci...313.1426H. doi:10.1126/science.1128235. PMID 16873612.
  • Wang, Jintuan; Takahashi, Eiichi; Xiong, Xiaolin; Chen, Linli; Li, Li; Suzuki, Toshihiro; Walter, Michael (2020). "The water-saturated solidus and second critical endpoint of peridotite: Implications for magma genesis within the mantle wedge". Journal of Geophysical Research: Solid Earth. 125 (8) e2020JB019452. Bibcode:2020JGRB..12519452W. doi:10.1029/2020JB019452.

References

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  1. ^ a b c "Chinese Academy of Sciences–Eiichi Takahashi". gig.cas.cn. Retrieved July 2, 2025.
  2. ^ "《平成16年度「21世紀COEプログラム」》「採択拠点の事業概要」について [採択状況]-11". mext.go.jp. Retrieved July 2, 2025.
  3. ^ "地殻流体：その実態と沈み込み変動への役割（高橋 栄一）". mext.go.jp. Retrieved July 2, 2025.
  4. ^ "Tokyo Institut of Technology Successive Library Directors・Ookayama Library Directors". libra.titech.ac.jp. Retrieved July 2, 2025.
  5. ^ "Science Knows No Borders: A Research Journey from Japan to China". english.gig.cas.cn. Retrieved July 2, 2025.
  6. ^ Klein, Emily M.; Langmuir, Charles H. (1987). "Global correlations of ocean ridge basalt chemistry with axial depth and crustal thickness". Journal of Geophysical Research: Solid Earth. 92 (B8): 8089–8115. Bibcode:1987JGR....92.8089K. doi:10.1029/JB092iB08p08089. hdl:10161/8320.
  7. ^ Baker, Michael B.; Stolper, Edward M. (1994). "Determining the composition of high-pressure mantle melts using diamond aggregates". Geochimica et Cosmochimica Acta. 58 (13): 2811–2827. Bibcode:1994GeCoA..58.2811B. doi:10.1016/0016-7037(94)90116-3.
  8. ^ Zhang, Jianzhong; Herzberg, Claude (1994). "Melting experiments on anhydrous peridotite KLB-1 from 5.0 to 22.5 GPa". Journal of Geophysical Research: Solid Earth. 99 (B9): 17729–17742. Bibcode:1994JGR....9917729Z. doi:10.1029/94JB01406.
  9. ^ Walter, Michael J. (1998). "Melting of Garnet Peridotite and the Origin of Komatiite and Depleted Lithosphere". Journal of Petrology. 39 (1): 29–60. doi:10.1093/petroj/39.1.29.
  10. ^ Wood, Bernard J. (1990). "Postspinel transformations and the width of the 670-km Discontinuity: A comment on "Postspinel transformations in the system Mg2SiO4–Fe2SiO4 and some geophysical implications" by E. Ito and E. Takahashi". Journal of Geophysical Research: Solid Earth. 95 (B8): 12681–12685. doi:10.1029/JB095iB08p12681.
  11. ^ Ringwood, A.E. (1991). "Phase transformations and their bearing on the constitution and dynamics of the mantle". Geochimica et Cosmochimica Acta. 55 (8): 2083–2110. Bibcode:1991GeCoA..55.2083R. doi:10.1016/0016-7037(91)90090-R.
  12. ^ Arai, Shoji; Ishimaru, Satoko (2008). "Insights into Petrological Characteristics of the Lithosphere of Mantle Wedge beneath Arcs through Peridotite Xenoliths: a Review". Journal of Petrology. 49 (4): 665–695. doi:10.1093/petrology/egm069.
  13. ^ "Book on Hawaii volcanic activity ranked best". Honolulu Star-Bulletin. August 13, 2003. p. 10 – via Newspapers.com.
  14. ^ Lindley, I.D. (2016). "Plate flexure and volcanism: Late Cenozoic tectonics of the Tabar–Lihir–Tanga–Feni alkalic province, New Ireland Basin, Papua New Guinea". Tectonophysics. 677–678: 312–323. Bibcode:2016Tectp.677..312L. doi:10.1016/j.tecto.2016.04.015.
  15. ^ Anderson, Don L. (2000). "The thermal state of the upper mantle; No role for mantle plumes". Geophysical Research Letters. 27 (22): 3623–3626. Bibcode:2000GeoRL..27.3623A. doi:10.1029/2000GL011533.
  16. ^ Pertermann, Maik; Hirschmann, Marc M. (2003). "Anhydrous partial melting experiments on MORB-like eclogite: Phase relations, phase compositions and mineral–melt partitioning of major elements at 2–3 GPa". Journal of Petrology. 44 (12): 2173–2201. doi:10.1093/petrology/egg074. hdl:20.500.11850/52838.
  17. ^ "F.W. Clarke Award". geochemsoc.org. Retrieved July 7, 2025.
  18. ^ "Past recipients of the Japan Society of Volcanology awards". kazan-g.sakura.ne.jp. Retrieved July 2, 2025.
  19. ^ "AGU–Eiichi Takahashi". American Geophysical Union. Retrieved July 2, 2025.
  20. ^ "Introduction of JpGU Fellow". Japan Geoscience Union. Retrieved July 2, 2025.
  21. ^ "高橋栄一名誉教授、吉田尚弘教授が紫綬褒章を受章". titech.ac.jp. Retrieved July 2, 2025.
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