The potassic sedimentary rocks in Gale Crater, Mars, as seen by ChemCam on board Curiosity

被引：64

作者：

Le Deit, L. ^{[1
]}

Mangold, N. ^{[1
]}

Forni, O. ^{[2
]}

Cousin, A. ^{[2
]}

Lasue, J. ^{[2
]}

Schroder, S. ^{[2
,3
]}

Wiens, R. C. ^{[4
]}

Sumner, D. ^{[5
]}

Fabre, C. ^{[6
]}

Stack, K. M. ^{[7
]}

Anderson, R. B. ^{[8
]}

Blaney, D. ^{[7
]}

Clegg, S. ^{[4
]}

Dromart, G. ^{[9
]}

Fisk, M. ^{[10
]}

Gasnault, O. ^{[2
]}

Grotzinger, J. P. ^{[11
]}

Gupta, S. ^{[12
]}

Lanza, N. ^{[4
]}

Le Mouelic, S. ^{[1
]}

Maurice, S. ^{[2
]}

McLennan, S. M. ^{[13
]}

Meslin, P. -Y. ^{[2
]}

Nachon, M. ^{[1
]}

Newsom, H. ^{[14
]}

Payre, V. ^{[6
]}

Rapin, W. ^{[2
]}

Rice, M. ^{[15
]}

Sautter, V. ^{[16
]}

Treiman, A. H. ^{[17
]}

机构：

[1] Univ Nantes, UMR CNRS 6112, LPG Nantes, Lab Planetol & Geodynam, Nantes, France

[2] Inst Rech Astrophys & Planetol, Toulouse, France

[3] German Aerosp Ctr DLR, Inst Opt Sensorsyst, Berlin, Germany

[4] Los Alamos Natl Lab, Los Alamos, NM USA

[5] Univ Calif Davis, Earth & Planetary Sci, Davis, CA 95616 USA

[6] Univ Lorraine, GeoRessources, Nancy, France

[7] CALTECH, Jet Prop Lab, Pasadena, CA USA

[8] US Geol Survey, Astrogeol Sci Ctr, Flagstaff, AZ 86001 USA

[9] ENS Lyon, Lab Geol Lyon, Terre Planetes Environm, Lyon, France

[10] Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA

[11] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA

[12] Imperial Coll London, London, England

[13] SUNY Stony Brook, Dept Geosci, Stony Brook, NY 11794 USA

[14] Univ New Mexico, Inst Meteorit, Albuquerque, NM 87131 USA

[15] Western Washington Univ, Geol Dept, Bellingham, WA 98225 USA

[16] Museum Hist Nat, LMCM, Paris, France

[17] Lunar & Planetary Inst, 3303 NASA Rd 1, Houston, TX 77058 USA

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS | 2016年 / 121卷 / 05期

关键词：

IN-SITU; INSTRUMENT SUITE; K-FELDSPAR; ORIGIN; ROVER; SANDSTONE; EVOLUTION; ROCKNEST; OLIVINE; OUTCROP;

D O I：

10.1002/2015JE004987

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The Mars Science Laboratory rover Curiosity encountered potassium-rich clastic sedimentary rocks at two sites in Gale Crater, the waypoints Cooperstown and Kimberley. These rocks include several distinct meters thick sedimentary outcrops ranging from fine sandstone to conglomerate, interpreted to record an ancient fluvial or fluvio-deltaic depositional system. From ChemCam Laser-Induced Breakdown Spectroscopy (LIBS) chemical analyses, this suite of sedimentary rocks has an overall mean K2O abundance that is more than 5 times higher than that of the average Martian crust. The combined analysis of ChemCam data with stratigraphic and geographic locations reveals that the mean K2O abundance increases upward through the stratigraphic section. Chemical analyses across each unit can be represented as mixtures of several distinct chemical components, i.e., mineral phases, including K-bearing minerals, mafic silicates, Fe-oxides, and Fe-hydroxide/oxyhydroxides. Possible K-bearing minerals include alkali feldspar (including anorthoclase and sanidine) and K-bearing phyllosilicate such as illite. Mixtures of different source rocks, including a potassium-rich rock located on the rim and walls of Gale Crater, are the likely origin of observed chemical variations within each unit. Physical sorting may have also played a role in the enrichment in K in the Kimberley formation. The occurrence of these potassic sedimentary rocks provides additional evidence for the chemical diversity of the crust exposed at Gale Crater.

引用

页码：784 / 804

页数：21

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