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Compositions of coarse and fine particles in martian soils at gale: A window into the production of soils
Los Alamos National Laboratory.
Institut de Recherche en Astrophysique et Planetologie, Toulouse.
Los Alamos National Laboratory.
Institut de Recherche en Astrophysique et Planetologie, Toulouse.
Vise andre og tillknytning
Rekke forfattare: 312015 (engelsk)Inngår i: Icarus (New York, N.Y. 1962), ISSN 0019-1035, E-ISSN 1090-2643, Vol. 249, s. 22-42Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
2015. Vol. 249, s. 22-42
HSV kategori
Forskningsprogram
Atmosfärsvetenskap
Identifikatorer
URN: urn:nbn:se:ltu:diva-12271DOI: 10.1016/j.icarus.2014.04.052ISI: 000348967300003Scopus ID: 2-s2.0-85028129318Lokal ID: b6137c57-222b-4bc3-a1e7-878eeec68e62OAI: oai:DiVA.org:ltu-12271DiVA, id: diva2:985221
Merknad

Godkänd; 2015; Bibliografisk uppgift: Javier Martín-Torres ingår i the MSL Science Team. Special Issue: First Year of MSL; 20150331 (ninhul)

Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2019-05-14bibliografisk kontrollert

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