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Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Geochemical and mineralogical indicators for aqueous processes in the Columbia Hills of Gusev crater, Mars
Author(s): Ming, Douglas Wayne
Mittlefehldt, David W
Morris, Richard Van
Golden, D C
Gellert, Ralf
Yen, Albert S
Clark, Benton C
Squyres, Steven W
Farrand, William H
Ruff, Steven W
Arvidson, Raymond E
Klingelhoefer, Goestar
McSween, Harry Y
Rodionov, Daniel S
Schröder, Christian
de Souza Jr, Paulo A
Wang, Alian
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Keywords: aqueous processes
Gusev Crater
Issue Date: Feb-2006
Date Deposited: 24-Oct-2013
Citation: Ming DW, Mittlefehldt DW, Morris RV, Golden DC, Gellert R, Yen AS, Clark BC, Squyres SW, Farrand WH, Ruff SW, Arvidson RE, Klingelhoefer G, McSween HY, Rodionov DS, Schröder C, de Souza Jr PA & Wang A (2006) Geochemical and mineralogical indicators for aqueous processes in the Columbia Hills of Gusev crater, Mars. Journal of Geophysical Research: Planets, 111 (E2), Art. No.: E02S12.
Abstract: Water played a major role in the formation and alteration of rocks and soils in the Columbia Hills. The extent of alteration ranges from moderate to extensive. Five distinct rock compositional classes were identified; the order for degree of alteration is Watchtower = Clovis >Wishstone = Peace > Backstay. The rover’s wheels uncovered one unusual soil (Paso Robles) that is the most S-rich material encountered. Clovis class rocks have compositions similar to Gusev plains soil but with higher Mg, Cl, and Br and lower Ca and Zn; Watchtower and Wishstone classes have high Al, Ti, and P and low Cr and Ni; Peace has high Mg and S and low Al, Na, and K; Backstay basalts have high Na and K compared to plains Adirondack basalts; and Paso Robles soil has high S and P. Some rocks are corundum-normative, indicating that their primary compositions were changed by loss and/or gain of rock-forming elements. Clovis materials consist of magnetite, nanophase ferric-oxides (npOx), hematite, goethite, Ca-phosphates, Ca- and Mg-sulfates, pyroxene, and secondary aluminosilicates. Wishstone and Watchtower rocks consist of Fe-oxides/oxyhydroxides, ilmenite, Ca-phosphate, pyroxene, feldspar, Mg-sulfates, and secondary aluminosilicates. Peace consists of magnetite, npOx, Mg- and Ca-sulfates, pyroxene, olivine, feldspar, apatite, halides, and secondary aluminosilicates. Paso Robles consists of Fe3+-, Mg-, Ca-, and other sulfates, Ca-phosphates, hematite, halite, allophane, and amorphous silica. Columbia Hills outcrops and rocks may have formed by the aqueous alteration of basaltic rocks, volcaniclastic materials, and/or impact ejecta by solutions that were rich in acid-volatile elements.
DOI Link: 10.1029/2005JE002560
Rights: Copyright 2006 by the American Geophysical Union. AGU allows authors to deposit their journal articles if the version is the final published citable version of record, the AGU copyright statement is clearly visible on the posting, and the posting is made 6 months after official publication by the AGU.

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