2016 Fiscal Year Final Research Report
Deciphering water contents in planetesimals
| Project/Area Number |
25707042
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Partial Multi-year Fund |
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| Research Field |
Geochemistry/Cosmochemistry
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Iizuka Tsuyoshi 東京大学, 理学(系)研究科(研究院), 准教授 (70614569)
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| Research Collaborator |
OZAWA Kazuhito
SANO Yuji
MIKOUCHI Takashi
NAKAI Shun'ichi
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Keywords | 水 / 年代測定 / 微惑星 |
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| Outline of Final Research Achievements |
To decipher the behaviors of water and other volatile components during planetary formation, we have conducted geochronology, geochemistry, and hydrogen isotopic study on various meteorite samples. We found that (1) some meteorites are depleted in volatile elements in similar degrees to the Earth but they possess water, (2) their formation ages are within ~10 million years after the solar system formation, and (3) a part of the meteorites and the Earth's water exhibit identical hydrogen isotopic compositions within analytical uncertainty. These findings imply that the Earth could have water since its accretion, thereby eliminating the requirement that the Earth's water was delivered by water-rich planetary materials such as chondrites after the Earth's core formation.
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| Free Research Field |
惑星地球化学
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