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Hokkaido University Collection of Scholarly and Academic Papers >
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Isotopic compositions of asteroidal liquid water trapped in fluid inclusions of chondrites
| Title: | Isotopic compositions of asteroidal liquid water trapped in fluid inclusions of chondrites |
| Authors: | Yurimoto, Hisayoshi Browse this author →KAKEN DB | | Itoh, Shoichi Browse this author →KAKEN DB | | Zolensky, Michael Browse this author | | Kusakabe, Minoru Browse this author | | Karen, Akiya Browse this author | | Bodnar, Robert Browse this author |
| Keywords: | fluid inclusion | | hydrogen isotope | | oxygen isotope | | asteroid | | water |
| Issue Date: | 2014 |
| Publisher: | The Geochemical Society of Japan |
| Journal Title: | Geochemical Journal |
| Volume: | 48 |
| Issue: | 6 |
| Start Page: | 549 |
| End Page: | 560 |
| Publisher DOI: | 10.2343/geochemj.2.0335 |
| Abstract: | Determination of isotopic composition of extraterrestrial liquid water provides important information regarding the origin of water on Earth and the terrestrial planets. Fluid inclusions in halite of ordinary chondrites are the only direct samples of extraterrestrial liquid water available for laboratory measurements. We determined H and O isotopic compositions of this water by secondary ion mass spectrometry equipped with a cryogenic apparatus for sample cooling. Isotopic compositions of the fluid inclusion fluids (brines) were highly variable among individual inclusions, -400 < δD < +1300‰; -20 < Δ17O < +30‰, indicating that these aqueous fluids were in isotopic disequilibrium before trapping in halite on asteroids. The isotopic variation of fluids shows that various degrees of water-rock interaction had been underway on the asteroids before trapping between D-rich-16O-poor aqueous fluid, D-poor-16O-rich aqueous fluid, and asteroidal rock by delivery of cometary water onto hydrous asteroids. This may be a fundamental mechanism in the evolution of modern planetary water. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/57641 |
| 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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