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ID 34742
本文ファイル
著者
Meng, Chuanmin
Zhu, Wenjun
He, Hongliang
キーワード
Hugoniot
decomposition
density decrease
exothermic
impact behavior
serpentine
NDC
地球科学・地学・地質学
抄録(英)
Detailed wave profiles of antigorite (a serpentine mineral) under plate-impact shock loading have been measured to a pressure of 131 GPa in order to understand its dynamic behavior because serpentine is present in pristine meteorites as well as in the Earth mantle. All the profiles indicate single wave structures, and a sudden decrease in density was detected at similar to 60 GPa with increasing pressure when shock-loaded for a long duration (similar to 0.6 mu s) using a thick flyer. Such a drop in density also was observed during recompression by a high-impedance window material (LiF). Although exothermic decomposition is generally considered to be fast, the decomposition of antigorite under shock loading requires a reaction time so that the Hugoniot may represent a metastable state at which stable phase cannot appear in a timely way. Based on these observations, antigorite decomposes exothermically into an assemblage of either brucite + stishovite + periclase or brucite + perovskite above a shock pressure of 60 GPa, but does not dehydrate endothermically into assemblages with water fluid. The observed dynamic behavior of serpentine, coupled with the previous results of the shock-recovered serpentines, reinforces that serpentine plays a key role to carry water within the snowline of the solar system.
掲載誌名
Journal of Geophysical Research - Solid Earth
117巻
開始ページ
B03212
出版年月日
2012
出版者
American Geophysical Union
ISSN
0148-0227
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
(c) 2012 by the American Geophysical Union.
関連情報URL
部局名
理学研究科