Hydrogen Isotopic Evolution of Earth's Seawater
| Project/Area Number |
26287125
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Geology
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
Ueno Yuichiro 東京工業大学, 理学院, 准教授 (90422542)
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| Co-Investigator(Kenkyū-buntansha) |
玄田 英典 東京工業大学, 地球生命研究所, 特任准教授 (90456260)
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| Co-Investigator(Renkei-kenkyūsha) |
SHIBUYA Takazo 国立研究開発法人海洋研究開発機構, 深海・地殻内生物圏研究分野, 研究員 (00512906)
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| Research Collaborator |
FORIEL Julien 東京工業大学, 地球生命研究所, 特任助教
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2016: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2015: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2014: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
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| Keywords | 水素同位体 / 海水の起源 / 地球史 / 惑星地質 |
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| Outline of Final Research Achievements |
Hydrogen isotopic compositions of Archean basalts were determined by TCEA-IRMS technique. The analysis of more than 200 samples from 3.2 Ga Cleaverville Formation showed that dD values of hydrous minerals are clearly correlated with metamorphic grade which reflect ocean-floor metamorphism at that time based on metamorphic mineral assemblages. Also, the dD values are correlated with water content of the basaltic rocks as observed in modern seafloor basalts. These observations all indicate that hydrous minerals in the Cleaverville basalts preserve the isotopic composition of Archean seawater. The estimated dD value of the 3.2 billion-years-old seawater is -21±5‰, indicating deuterium content of Earth's seawater increased through the history of the Earth, potentially owing to hydrogen escape into space. Furthermore, we found igneous amphibole from the most D-depleted sample, suggesting not only Archean seawater but also Archean mantle was depleted in deuterium.
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Report
(4 results)
Research Products
(36 results)
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[Journal Article] Multiple sulfur isotope geochemistry of Dharwar Supergroup, Southern India: Late Archean record of changing atmospheric chemistry2017
Author(s)
Mishima, K., Yamazaki, R., Satish-Kumar, M., Ueno, Y., Hokada, T. & Toyoshima, T.
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Journal Title
Earth and Planetary Science Letters
Volume: 464
Pages: 69-83
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] PIXE and microthermometric analyses of fluid inclusions in hydrothermal quartz from the 2.2 Ga Ongeluk Formation, South Africa: implications for ancient seawater salinity.2016
Author(s)
Saito, T., Shibuya, T., Komiya, T., Kitajima, K., Yamamoto, S., Nishizawa, M., Ueno, Y., Kurosawa, M., and Maruyama, S.
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Journal Title
Precambrian Research
Volume: 286
Pages: 337-351
DOI
Related Report
Peer Reviewed / Acknowledgement Compliant
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[Journal Article] Simultaneous determinations of fluorine, chlorine, and sulfur in rock samples by ion chromatography combined with pyrohydrolysis2015
Author(s)
Shimizu, K., Suzuki, K., Saitoh, M., Konno, U., Kawagucci, S., Ueno, Y.
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Journal Title
GEOCHEMICAL JOURNAL
Volume: 49
Issue: 1
Pages: 113-124
DOI
NAID
ISSN
0016-7002, 1880-5973
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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[Journal Article] Reply to comment on "Origin of methane in serpentinite-hosted hydrothermal systems: The CH4-H2-H2O hydrogen isotope systematics of the Hakuba Happo hot spring" by Suda et al. [Earth Planet. Sci. Lett. 386 (2014) 112-125]2014
Author(s)
Suda K, Ueno Y, Yoshiazaki M, Nakamura H, Kurokawa K, Nishiyama E, Yoshino K, Hongoh Y, Kawachi K, Omori S, Yamada K, Yoshida N, Maruyama S
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Journal Title
Earth and Planetary Science Letters
Volume: 401
Pages: 376-377
DOI
Related Report
Peer Reviewed
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