| Budget Amount *help |
¥25,610,000 (Direct Cost: ¥19,700,000、Indirect Cost: ¥5,910,000)
Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2014: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
Fiscal Year 2013: ¥11,830,000 (Direct Cost: ¥9,100,000、Indirect Cost: ¥2,730,000)
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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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