globalchange  > 气候减缓与适应
DOI: 10.1029/2017JE005483
Scopus记录号: 2-s2.0-85052479193
论文题名:
In Situ Analysis of Opal in Gale Crater, Mars
作者: Rapin W.; Chauviré B.; Gabriel T.S.J.; McAdam A.C.; Ehlmann B.L.; Hardgrove C.; Meslin P.-Y.; Rondeau B.; Dehouck E.; Franz H.B.; Mangold N.; Chipera S.J.; Wiens R.C.; Frydenvang J.; Schröder S.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期:8
起始页码: 1955
结束页码: 1972
语种: 英语
英文关键词: Gale crater ; hydrogen ; Mars ; MSL ; opal ; water
英文摘要: Silica enrichments resulting in up to ~90 wt% SiO2 have been observed by the Curiosity rover's instruments in Gale crater, Mars, within the Murray and Stimson formations. Samples acquired by the rover drill revealed a significant abundance of an X-ray amorphous silica phase. Laser-induced breakdown spectroscopy (LIBS) highlights an overall correlation of the hydrogen signal with silica content for these Si-enriched targets. The increased hydration of the high-silica rocks compared to the surrounding bedrock is also confirmed by active neutron spectroscopy. Laboratory LIBS experiments have been performed to calibrate the hydrogen signal and show that the correlation observed on Mars is consistent with a silica phase containing on average 6.3 ± 1.4 wt% water. X-ray diffraction and LIBS measurements indicate that opal-A, amorphous hydrated silica, is the most likely phase containing this water in the rocks. Pyrolysis experiments were also performed on drilled samples by the Sample Analysis at Mars (SAM) instrument to measure volatile content, but the data suggests that most of the water was released during handling prior to pyrolysis. The inferred low-temperature release of water helps constrain the nature of the opal. Given the geological context and the spatial association with other phases such as calcium sulfates, the opal was likely formed from multiple diagenetic fluid events and possibly represents the latest significant water-rock interaction in these sedimentary rocks. ©2018. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113343
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作者单位: Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; School of Mathematical and Physical Sciences, University of Technology, Sydney, NSW, Australia; Dr. Eduard Gübelin Association for Research and Identification of Precious Stones, Lucerne, Switzerland; School of Earth and Space Exploration, Arizona State University, Tempe, AZ, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, CNRS, UPS, CNES, Toulouse, France; Laboratoire de Planétologie et Géodynamique, Université de Nantes, Nantes, France; Université de Lyon, UCBL, ENSL, CNRS, LGL-TPE, Villeurbanne, France; Chesapeake Energy, Oklahoma City, OK, United States; Los Alamos National Laboratory, Los Alamos, NM, United States; Natural History Museum of Denmark, University of Copenhagen, Copenhagen, Denmark; German Aerospace Center (DLR), Institut für Optische Sensorsysteme, Berlin-Adlershof, Germany

Recommended Citation:
Rapin W.,Chauviré B.,Gabriel T.S.J.,et al. In Situ Analysis of Opal in Gale Crater, Mars[J]. Journal of Geophysical Research: Planets,2018-01-01,123(8)
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