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Minaralogy of the Nili Fossae region with OMEGA/Mars Express data: Aqueous alteration of the crust

Mangold, N. and Poulet, F. and Mustard, J. F. and Bibring, J.-P. and Gondet, B. and Langevin, Y. and Ansan, P. and Masson, P. and Fasset, C. and Head, J. W. and Hoffmann, Harald and Neukum, G. (2007) Minaralogy of the Nili Fossae region with OMEGA/Mars Express data: Aqueous alteration of the crust. Journal of Geophysical Research, 112 (E08S04). AGU. DOI: 10.1029/2006JE002835 ISSN 0148-0227

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Abstract

Nili Fossaeis a region with fresh exposures of old material. OMEGA spectral data have revealed a strong diversity of minerals in the Nili Fossae region, including mafic minerals and phyllosilicates. Phyllosilicates are found to be primarily Fe-rich smectites. These phylloslilicates are observed only on the Noachian crust, in four types of locations: Three are without any signatures other than phyllosilicates, on (1) smooth layered deposits, (2) massive exhumed material, and (3) crater ejecta, and one type of location is asociated with olivine (4) over an altered mafic unit. This diversity suggests a widespread liquid water activty and a variety of alteration processes. The formation of phyllosilicates underwent considerable reduction, if not cessation, by the time of formation of Syrtis Major lava flows in the Hesperian period. Phyllosilicates are spatially and chronologically disconnected from the fluvial and depositional landforms observed in the Nili Fossae region. Observations suggest that these landforms formed after the extensive formation of phyllosilicates during short periods of time and/or temperatures close to freezing.

Item URL in elib:https://elib.dlr.de/52945/
Document Type:Article
Title:Minaralogy of the Nili Fossae region with OMEGA/Mars Express data: Aqueous alteration of the crust
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mangold, N.Université Paris-Sud, Orsay, FrankreichUNSPECIFIED
Poulet, F.Institut d'Astrophysique Spatiale, CNRS, Orsay, FrankreichUNSPECIFIED
Mustard, J. F.Brown University, Providence, R.I., USAUNSPECIFIED
Bibring, J.-P.Institut d'Astrophysique Spatiale, CNRS, Orsay, FrankreichUNSPECIFIED
Gondet, B.Institut d'Astrophysique Spatiale, CNRS, Orsay, FrankreichUNSPECIFIED
Langevin, Y.Institut d'Astrophysique Spatiale, CNRS, Orsay, FrankreichUNSPECIFIED
Ansan, P.Université Paris-Sud, Orsay, FrankreichUNSPECIFIED
Masson, P.Université Paris-Sud, Orsay, FrankreichUNSPECIFIED
Fasset, C.Brown University, Providence, R.I., USAUNSPECIFIED
Head, J. W.Brown University, Providence, R.I., USAUNSPECIFIED
Hoffmann, HaraldUNSPECIFIEDUNSPECIFIED
Neukum, G.Freie Universität Berlin, DeutschlandUNSPECIFIED
Date:4 August 2007
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:112
DOI :10.1029/2006JE002835
Publisher:AGU
ISSN:0148-0227
Status:Published
Keywords:Mars, mineralogy, OMEGA, Mars Express
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Projekt MARS-EXPRESS / HRSC (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Hoffmann, Harald
Deposited On:17 Jan 2008
Last Modified:27 Apr 2009 14:40

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