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Mineralogical analyses of surface sediments in the Antarctic Dry Valleys: Coordinated analyses of Raman spectra, reflectance spectra and elemental abundances

Bishop, J.L. and Englert, P. and Patel, S. and Tirsch, D. and Roy, A. J. and Koerberl, C. and Böttger, Ute and Hanke, F. and Jaumann, R. (2014) Mineralogical analyses of surface sediments in the Antarctic Dry Valleys: Coordinated analyses of Raman spectra, reflectance spectra and elemental abundances. Philosophical Transactions of the Royal Society A, 372 (201401). Royal Society Publishing. DOI: 10.1098/rsta.2014.0198 ISSN 1364-503X

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Abstract

Surface sediments at Lakes Fryxell, Vanda and Brownworth in the Antarctic Dry Valleys (ADV) were investigated as analogs for the cold, dry environment on Mars. Sediments were sampled from regions surrounding the lakes and from the ice cover on top of the lakes. The ADV sediments were studied using Raman spectra of individual grains and reflectance spectra of bulk particulate samples and compared with previous analyses of subsurface and lakebottom sediments. Elemental abundances were coordinated with the spectral data in order to assess trends in sediment alteration. The surface sediments in this study were compared with lakebottom sediments [1] and samples from soil pits [2, 3]. Feldspar, quartz and pyroxene are common minerals found in all the sediments. Minor abundances of carbonate, chlorite, actinolite and allophane are also found in the surface sediments, and are similar to minerals found in greater abundance in the lakebottom sediments. Surface sediment formation is dominated by physical processes; a few cm below the surface chemical alteration sets in, while lakebottom sediments experience bio-mineralization. Characterizing the mineralogic variations in these samples provides insights into the alteration processes occurring in the ADV and supports understanding alteration in the cold and dry environment on Mars.

Item URL in elib:https://elib.dlr.de/86364/
Document Type:Article
Title:Mineralogical analyses of surface sediments in the Antarctic Dry Valleys: Coordinated analyses of Raman spectra, reflectance spectra and elemental abundances
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bishop, J.L.Carl Sagan Center, SETI Institute and NASA-Ames Research Center, Mountain View, CAUNSPECIFIED
Englert, P.University of Hawaii at Mānoa, HIUNSPECIFIED
Patel, S.San Jose State University, CAUNSPECIFIED
Tirsch, D.daniela.tirsch (at) dlr.deUNSPECIFIED
Roy, A. J.Department of Land and Natural Resources, Honolulu, HI, USAUNSPECIFIED
Koerberl, C.Department of Lithospheric Research, University of Vienna, ViennaUNSPECIFIED
Böttger, UteUte.Boettger (at) dlr.deUNSPECIFIED
Hanke, F.Fanziska.Hanke (at) dlr.deUNSPECIFIED
Jaumann, R.ralf.jaumann (at) dlr.deUNSPECIFIED
Date:November 2014
Journal or Publication Title:Philosophical Transactions of the Royal Society A
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:372
DOI :10.1098/rsta.2014.0198
Publisher:Royal Society Publishing
ISSN:1364-503X
Status:Published
Keywords:Antarctic Dry Valleys, sediments, Raman spectra, reflectance spectra, chemistry
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt MARS-EXPRESS / HRSC
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Institute of Planetary Research > Experimentelle Planetenphysik
Deposited By: Tirsch, Daniela
Deposited On:07 Jan 2015 09:55
Last Modified:10 Jan 2019 15:54

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