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Geochemistry of the Bagnold dune field as observed by ChemCam and comparison with other aeolian deposits at Gale crater

Cousin, Agnes and Dehouck, Erwin and Meslin, P.-Y. and Forni, O. and Williams, A. and Stein, Nathan and Gasnault, O. and Bridges, N. and Ehlmann, Bethany and Schröder, Susanne and Payré, V. and Rapin, W. and Pinet, P. and Sautter, V. and Lanza, N. and Lasue, J. and Maurice, S. and Wiens, R. C. (2017) Geochemistry of the Bagnold dune field as observed by ChemCam and comparison with other aeolian deposits at Gale crater. Journal of Geophysical Research. Wiley. DOI: 10.1002/2017JE005261 ISSN 0148-0227

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Abstract

The Curiosity rover conducted the first field investigation of an active extraterrestrial dune. This study of the Bagnold dunes focuses on the ChemCam chemical results and also presents findings on the grain size distributions based on the ChemCam RMI and MAHLI images. These active dunes are composed of grains that are mostly <250 μm. Their composition is overall similar to that of the aeolian deposits analyzed all along the traverse (“Aeolis Palus soils”). Nevertheless, the dunes contain less volatiles (Cl, H, S) than the Aeolis Palus soils, which appears to be due to a lower content of volatile-rich fine-grained particles (<100 μm), or a lower content of volatile-rich amorphous component, possibly as a result of: 1) a lower level of chemical alteration; 2) the removal of an alteration rind at the surface of the grains during transport; 3) a lower degree of interaction with volcanic gases/aerosols; or 4) physical sorting that removed the smallest and most altered grains. Analyses of the >150 μm grain-size dump piles have shown that coarser grains (150-250 μm) are enriched in the mafic elements Fe and Mn, suggesting a larger content in olivine compared to smaller grains (<150 μm) of the Bagnold dunes. Moreover, the chemistry of soils analyzed in the vicinity of the dunes indicates that they are similar to the dune material. All these observations suggest that the olivine content determined by X-ray diffraction of the <150 μm grain-size sample should be considered as a lower limit for the Bagnold dunes.

Item URL in elib:https://elib.dlr.de/113435/
Document Type:Article
Title:Geochemistry of the Bagnold dune field as observed by ChemCam and comparison with other aeolian deposits at Gale crater
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Cousin, AgnesUNSPECIFIEDUNSPECIFIED
Dehouck, ErwinUNSPECIFIEDUNSPECIFIED
Meslin, P.-Y.UNSPECIFIEDUNSPECIFIED
Forni, O.UNSPECIFIEDUNSPECIFIED
Williams, A.UNSPECIFIEDUNSPECIFIED
Stein, NathanUNSPECIFIEDUNSPECIFIED
Gasnault, O.UNSPECIFIEDUNSPECIFIED
Bridges, N.UNSPECIFIEDUNSPECIFIED
Ehlmann, BethanyUNSPECIFIEDUNSPECIFIED
Schröder, SusanneSusanne.Schroeder (at) dlr.deUNSPECIFIED
Payré, V.UNSPECIFIEDUNSPECIFIED
Rapin, W.UNSPECIFIEDUNSPECIFIED
Pinet, P.UNSPECIFIEDUNSPECIFIED
Sautter, V.UNSPECIFIEDUNSPECIFIED
Lanza, N.UNSPECIFIEDUNSPECIFIED
Lasue, J.UNSPECIFIEDUNSPECIFIED
Maurice, S.UNSPECIFIEDUNSPECIFIED
Wiens, R. C.UNSPECIFIEDUNSPECIFIED
Date:2017
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1002/2017JE005261
Publisher:Wiley
ISSN:0148-0227
Status:Published
Keywords:Mars, dunes, soils, LIBS, ChemCam
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Optische Sensorik - Theorie, Kalibration, Verifikation, R - Vorhaben Robotischer Wissenschafts-Explorer
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Schröder, Susanne
Deposited On:01 Aug 2017 09:50
Last Modified:08 Mar 2018 18:44

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