globalchange  > 气候减缓与适应
DOI: 10.1002/2017JE005339
Scopus记录号: 2-s2.0-85041107346
论文题名:
Retrieval of Compositional End-Members From Mars Exploration Rover Opportunity Observations in a Soil-Filled Fracture in Marathon Valley, Endeavour Crater Rim
作者: Stein N.T.; Arvidson R.E.; O'Sullivan J.A.; Catalano J.G.; Guinness E.A.; Politte D.V.; Gellert R.; VanBommel S.J.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期:1
起始页码: 278
结束页码: 290
语种: 英语
英文关键词: aqueous alteration ; Endeavour crater ; Marathon Valley ; Mars ; Opportunity rover
Scopus关键词: crater ; exploration ; fracture zone ; host rock ; Mars ; multispectral image ; observational method ; soil ; sulfate group ; thermodynamics ; X-ray spectroscopy
英文摘要: The Opportunity rover investigated a gentle swale on the rim of Endeavour crater called Marathon Valley where a series of bright planar outcrops are cut into polygons by fractures. A wheel scuff performed on one of the soil-filled fracture zones revealed the presence of three end-members identified on the basis of Pancam multispectral imaging observations covering ~0.4 to 1 μm: red and dark pebbles, and a bright soil clod. Multiple overlapping Alpha Particle X-ray Spectrometer (APXS) measurements were collected on three targets within the scuff zone. The field of view of each APXS measurement contained various proportions of the Pancam-based end-members. Application of a log maximum likelihood method for retrieving the composition of the end-members using the 10 APXS measurements shows that the dark pebble end-member is compositionally similar to average Mars soil, with slightly elevated S and Fe. In contrast, the red pebble end-member exhibits enrichments in Al and Si and is depleted in Fe and Mg relative to average Mars soil. The soil clod end-member is enriched in Mg, S, and Ni. Thermodynamic modeling of the soil clod end-member composition indicates a dominance of sulfate minerals. We hypothesize that acidic fluids in fractures leached and oxidized the basaltic host rock, forming the red pebbles, and then evaporated to leave behind sulfate-cemented soil. ©2017. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114854
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作者单位: Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; Department of Earth and Planetary Sciences, Washington University in Saint Louis, Saint Louis, MO, United States; Department of Electrical Engineering, Washington University in Saint Louis, Saint Louis, MO, United States; Department of Physics, University of Guelph, Guelph, ON, Canada

Recommended Citation:
Stein N.T.,Arvidson R.E.,O'Sullivan J.A.,et al. Retrieval of Compositional End-Members From Mars Exploration Rover Opportunity Observations in a Soil-Filled Fracture in Marathon Valley, Endeavour Crater Rim[J]. Journal of Geophysical Research: Planets,2018-01-01,123(1)
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