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Stratigraphy and mineralogy of Candor Mensa, West Candor Chasma, Mars: Insights into the geologic history of Valles Marineris

Fueten, Frank and Flahaut, Jessica and Stesky, Robert and Hauber, Ernst and Rossi, A.P. (2014) Stratigraphy and mineralogy of Candor Mensa, West Candor Chasma, Mars: Insights into the geologic history of Valles Marineris. Journal of Geophysical Research, 119, pp. 1-24. Wiley. DOI: 10.1002/2013JE004557 ISSN 0148-0227

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/2013JE004557/abstract

Abstract

Candor Mensa, an interior layered deposit (ILD) in Valles Marineris, Mars, consists of two stratigraphically distinct units, the lower of which comprises the bulk of the mensa. This lower unit is approximately 5 km thick and composed of parallel layers, 4 to 14 m in thickness and associated with monohydrated sulfates. The lower unit is disconformably overlain by an upper unit composed of thinner (< 3 m) layers with diagnostic polyhydrated sulfate signatures. The original extent of proto-Candor Mensa and its lower unit included neighboring Baetis Mensa. We suggest that the source material for both units is airborne dust or ash but that the depositional environment for the units differs. First, the lower unit was deposited during the subsidence of an enclosed water-filled basin. This basin/lake could have been frozen periodically, with freeze-thaw episodes possibly linked to Martian obliquity cycles. Erosion, including the potential action of glaciers, was able to remove large volumes of material out of the basin during the tectonism that produced the current geometry of Valles Marineris. Deposition of the upper unit postdates this event and took place in the absence of standing water at high elevation. Groundwater or snowmelt may have provided the water required for sulfate formation and deposit induration. We conclude that the major break in sedimentation recorded by this ILD deposit coincides with linking of ancestral basins into the current geometry of Valles Marineris chasmata and that it was possible to form hydrated minerals after this event.

Item URL in elib:https://elib.dlr.de/88285/
Document Type:Article
Title:Stratigraphy and mineralogy of Candor Mensa, West Candor Chasma, Mars: Insights into the geologic history of Valles Marineris
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fueten, FrankBrock UniversityUNSPECIFIED
Flahaut, JessicaVrije Universiteit AmsterdamUNSPECIFIED
Stesky, RobertPangaea ScientificUNSPECIFIED
Hauber, Ernsternst.hauber (at) dlr.deUNSPECIFIED
Rossi, A.P.Jacobs University BremenUNSPECIFIED
Date:2014
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
Open Access:No
In DOAJ:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:119
DOI :10.1002/2013JE004557
Page Range:pp. 1-24
Publisher:Wiley
ISSN:0148-0227
Status:Published
Keywords:Mars, sediment, layering, HRSC, water, climate, mineralogy
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
Deposited By: Hauber, Ernst
Deposited On:26 May 2014 09:12
Last Modified:26 May 2014 09:12

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