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A dual origin for water in carbonaceous asteroids revealed by CM chondrites
| Title: | A dual origin for water in carbonaceous asteroids revealed by CM chondrites |
| Authors: | Piani, Laurette Browse this author | | Yurimoto, Hisayoshi Browse this author →KAKEN DB | | Remusat, Laurent Browse this author |
| Issue Date: | Apr-2018 |
| Publisher: | Nature Publishing Group |
| Journal Title: | Nature astronomy |
| Volume: | 2 |
| Issue: | 4 |
| Start Page: | 317 |
| End Page: | 323 |
| Publisher DOI: | 10.1038/s41550-018-0413-4 |
| Abstract: | Carbonaceous asteroids represent the principal source of water in the inner Solar System and might correspond to the main contributors for the delivery of water to Earth. Hydrogen isotopes in water-bearing primitive meteorites, for example carbonaceous chondrites, constitute a unique tool for deciphering the sources of water reservoirs at the time of asteroid formation. However, fine-scale isotopic measurements are required to unravel the effects of parent-body processes on the pre-accretion isotopic distributions. Here, we report in situ micrometre-scale analyses of hydrogen isotopes in six CM-type carbonaceous chondrites, revealing a dominant deuterium-poor water component (delta D = -350 +/- 40%) mixed with deuterium-rich organic matter. We suggest that this deuterium-poor water corresponds to a ubiquitous water reservoir in the inner protoplanetary disk. A deuterium-rich water signature has been preserved in the least altered part of the Paris chondrite (delta D-Paris >= -69 +/- 163 parts per thousand) in hydrated phases possibly present in the CM rock before alteration. The presence of the deuterium-enriched water signature in Paris might indicate that transfers of ice from the outer to the inner Solar System were significant within the first million years of the history of the Solar System. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/71449 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 圦本 尚義
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