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Isotopic compositions of asteroidal liquid water trapped in fluid inclusions of chondrites

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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
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
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)

Submitter: 圦本 尚義

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