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DOI | 10.1016/j.epsl.2015.02.017 |
Alteration of immature sedimentary rocks on Earth and Mars: Recording aqueous and surface-atmosphere processes | |
Cannon, Kevin M.1; Mustard, John F.1; Salvatore, Mark R.2 | |
通讯作者 | Cannon, Kevin M. |
来源期刊 | EARTH AND PLANETARY SCIENCE LETTERS
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ISSN | 0012-821X |
EISSN | 1385-013X |
出版年 | 2015 |
卷号 | 417页码:78-86 |
英文摘要 | Rock alteration and rind formation in analog environments like Antarctica may provide clues to rock alteration and therefore paleoclimates on Mars. Clastic sedimentary rocks derived from basaltic sources have been studied in situ by martian rovers and are likely abundant on the surface of Mars. However, how such rock types undergo alteration when exposed to different environmental conditions is poorly understood compared with alteration of intact basaltic flows. Here we characterize alteration in the chemically immature Carapace Sandstone from Antarctica, a terrestrial analog for martian sedimentary rocks. We employ a variety of measurements similar to those used on previous and current Mars missions. Laboratory techniques included bulk chemistry, powder X-ray diffraction (XRD), hyperspectral imaging and X-ray absorption spectroscopy. Through these methods we find that primary basaltic material in the Carapace Sandstone is pervasively altered to hydrated clay minerals and palagonite as a result of water-rock interaction. A thick orange rind is forming in current Antarctic conditions, superimposing this previous aqueous alteration signature. The rind exhibits a higher reflectance at visible-near infrared wavelengths than the rock interior, with an enhanced ferric absorption edge likely due to an increase in Fe3+ of existing phases or the formation of minor iron (oxy)hydroxides. This alteration sequence in the Carapace Sandstone results from decreased water-rock interaction over time, and weathering in a cold, dry environment, mimicking a similar transition early in martian history. This transition may be recorded in sedimentary rocks on Mars through a similar superimposition mechanism, capturing past climate changes at the hand sample scale. Our results also suggest that basalt-derived sediments could have sourced significant volumes of hydrated minerals on early Mars due to their greater permeability compared with intact igneous rocks. (C) 2015 Elsevier B.V. All rights reserved. |
英文关键词 | Mars sedimentary weathering alteration spectroscopy |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000351799400009 |
WOS关键词 | REFLECTANCE SPECTROSCOPY ; MERIDIANI-PLANUM ; CARAPACE-NUNATAK ; ARID CONDITIONS ; CLAY-MINERALS ; VICTORIA-LAND ; ALLAN-HILLS ; ANTARCTICA ; CHEMISTRY ; OXIDATION |
WOS类目 | Geochemistry & Geophysics |
WOS研究方向 | Geochemistry & Geophysics |
来源机构 | Arizona State University |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/186687 |
作者单位 | 1.Brown Univ, Dept Earth Environm & Planetary Sci, Providence, RI 02912 USA; 2.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA |
推荐引用方式 GB/T 7714 | Cannon, Kevin M.,Mustard, John F.,Salvatore, Mark R.. Alteration of immature sedimentary rocks on Earth and Mars: Recording aqueous and surface-atmosphere processes[J]. Arizona State University,2015,417:78-86. |
APA | Cannon, Kevin M.,Mustard, John F.,&Salvatore, Mark R..(2015).Alteration of immature sedimentary rocks on Earth and Mars: Recording aqueous and surface-atmosphere processes.EARTH AND PLANETARY SCIENCE LETTERS,417,78-86. |
MLA | Cannon, Kevin M.,et al."Alteration of immature sedimentary rocks on Earth and Mars: Recording aqueous and surface-atmosphere processes".EARTH AND PLANETARY SCIENCE LETTERS 417(2015):78-86. |
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