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Compositions of coarse and fine particles in martian soils at gale: A window into the production of soils

Cousin, A. and Meslin, P.Y. and Wiens, R.C. and Rapin, W. and Mangold, N. and Fabre, C. and Gasnault, O. and Forni, O. and Tokar, R. and Ollila, A. and Schröder, S. and Lasue, J. and Maurice, S. and Sautter, V. and Newsom, H. and Vaniman, D. and Le Mouélic, S. and Dyar, D. and Berger, G. and Blaney, D. and Nachon, M. and Dromart, G. and Lanza, N. and Clark, B. and Clegg, S. and Goetz, W. and Berger, J. and Barraclough, B. and Delapp, D. and the MSL Science Team and DLR Collaborator (MSL-Science Team), Reitz G. (2015) Compositions of coarse and fine particles in martian soils at gale: A window into the production of soils. Icarus, 249, pp. 22-42. Elsevier. doi: 10.1016/j.icarus.2014.04.052. ISSN 0019-1035.

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1016/j.icarus.2014.04.052

Abstract

The ChemCam instrument onboard the Curiosity rover provides for the first time an opportunity to study martian soils at a sub-millimeter resolution. In this work, we analyzed 24 soil targets probed by ChemCam during the first 250 sols on Mars. Using the depth profile capability of the ChemCam LIBS (Laser-Induced Breakdown Spectroscopy) technique, we found that 45% of the soils contained coarse grains (>500 μm). Three distinct clusters have been detected: Cluster 1 shows a low SiO2 content; Cluster 2 corresponds to coarse grains with a felsic composition, whereas Cluster 3 presents a typical basaltic composition. Coarse grains from Cluster 2 have been mostly observed exposed in the vicinity of the landing site, whereas coarse grains from Clusters 1 and 3 have been detected mostly buried, and were found all along the rover traverse. The possible origin of these coarse grains was investigated. Felsic (Cluster 2) coarse grains have the same origin as the felsic rocks encountered near the landing site, whereas the origin of the coarse grains from Clusters 1 and 3 seems to be more global. Fine-grained soils (particle size < laser beam diameter which is between 300 and 500 μm) show a homogeneous composition all along the traverse, different from the composition of the rocks encountered at Gale. Although they contain a certain amount of hydrated amorphous component depleted in SiO₂, possibly present as a surface coating, their overall chemical homogeneity and their close-to-basaltic composition suggest limited, or isochemical alteration, and a limited interaction with liquid water. Fine particles and coarse grains from Cluster 1 have a similar composition, and the former could derive from weathering of the latter. Overall martian soils have a bulk composition between that of fine particles and coarse grains. This work shows that the ChemCam instrument provides a means to study the variability of soil composition at a scale not achievable by bulk chemical analyses.

Item URL in elib:https://elib.dlr.de/99569/
Document Type:Article
Title:Compositions of coarse and fine particles in martian soils at gale: A window into the production of soils
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Cousin, A.Los Alamos National Laboratory, Los Alamos, NM 87544, USA; acousin (at) lanl.govUNSPECIFIED
Meslin, P.Y.UNSPECIFIEDUNSPECIFIED
Wiens, R.C.UNSPECIFIEDUNSPECIFIED
Rapin, W.UNSPECIFIEDUNSPECIFIED
Mangold, N.UNSPECIFIEDUNSPECIFIED
Fabre, C.UNSPECIFIEDUNSPECIFIED
Gasnault, O.UNSPECIFIEDUNSPECIFIED
Forni, O.UNSPECIFIEDUNSPECIFIED
Tokar, R.UNSPECIFIEDUNSPECIFIED
Ollila, A.UNSPECIFIEDUNSPECIFIED
Schröder, S.UNSPECIFIEDUNSPECIFIED
Lasue, J.UNSPECIFIEDUNSPECIFIED
Maurice, S.UNSPECIFIEDUNSPECIFIED
Sautter, V.UNSPECIFIEDUNSPECIFIED
Newsom, H.UNSPECIFIEDUNSPECIFIED
Vaniman, D.UNSPECIFIEDUNSPECIFIED
Le Mouélic, S.UNSPECIFIEDUNSPECIFIED
Dyar, D.UNSPECIFIEDUNSPECIFIED
Berger, G.UNSPECIFIEDUNSPECIFIED
Blaney, D.UNSPECIFIEDUNSPECIFIED
Nachon, M.UNSPECIFIEDUNSPECIFIED
Dromart, G.UNSPECIFIEDUNSPECIFIED
Lanza, N.UNSPECIFIEDUNSPECIFIED
Clark, B.UNSPECIFIEDUNSPECIFIED
Clegg, S.UNSPECIFIEDUNSPECIFIED
Goetz, W.UNSPECIFIEDUNSPECIFIED
Berger, J.UNSPECIFIEDUNSPECIFIED
Barraclough, B.UNSPECIFIEDUNSPECIFIED
Delapp, D. and the MSL Science TeamUNSPECIFIEDUNSPECIFIED
DLR Collaborator (MSL-Science Team), Reitz G.Radiation Biology Department, Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany.UNSPECIFIED
Date:2015
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:249
DOI :10.1016/j.icarus.2014.04.052
Page Range:pp. 22-42
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:Mars; Mars, surface; Spectroscopy; Regoliths
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Vorhaben MSL-Radiation (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Radiation Biology
Deposited By: Kopp, Kerstin
Deposited On:26 Nov 2015 15:20
Last Modified:06 Sep 2019 15:26

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