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Hydration state of calcium sulfates in Gale crater: Identification of bassanite veins.

Rapin, W. and Meslin, P.-Y. and Maurice, S. and Vaniman, D. and Nachon, M. and Mangold, N. and Schröder, Susanne and Gasnault, O. and Forni, O. and Wiens, R. C. (2016) Hydration state of calcium sulfates in Gale crater: Identification of bassanite veins. Earth and Planetary Science Letters. Elsevier. DOI: doi/10.1016/j.epsl.2016.07.045 ISSN 0012-821X

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Abstract

In-situ analyses reveal the presence of hydrogen within calcium sulfate veins crosscutting the sediments found in Gale crater. Laboratory experiments were performed to calibrate the hydrogen signal measured by laser induced breakdown spectroscopy (LIBS) in a range applicable to martian data. The analyses indicate that all veins targeted so far at Gale consist predominantly of bassanite which most likely formed by dehydration of gypsum. This scenario suggests that the percolating water produced gypsum, possibly by hydration of anhydrite in aqueous solution, and remained at temperatures below ~60 °C at that time. Desiccating conditions followed, consistent with a hyperarid climate and favored by burial or impacts. Additionally, anhydrite with lesser bassanite has been found by XRD in samples of sediments hosting the veins. Our result suggests bassanite is likely found in the veins and anhydrite may be more common as a fine-grained component within the sediments.

Item URL in elib:https://elib.dlr.de/110027/
Document Type:Article
Title:Hydration state of calcium sulfates in Gale crater: Identification of bassanite veins.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rapin, W.UNSPECIFIEDUNSPECIFIED
Meslin, P.-Y.UNSPECIFIEDUNSPECIFIED
Maurice, S.UNSPECIFIEDUNSPECIFIED
Vaniman, D.UNSPECIFIEDUNSPECIFIED
Nachon, M.UNSPECIFIEDUNSPECIFIED
Mangold, N.UNSPECIFIEDUNSPECIFIED
Schröder, SusanneSusanne.Schroeder (at) dlr.deUNSPECIFIED
Gasnault, O.UNSPECIFIEDUNSPECIFIED
Forni, O.UNSPECIFIEDUNSPECIFIED
Wiens, R. C.UNSPECIFIEDUNSPECIFIED
Date:October 2016
Journal or Publication Title:Earth and Planetary Science Letters
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :doi/10.1016/j.epsl.2016.07.045
Publisher:Elsevier
ISSN:0012-821X
Status:Published
Keywords:Mars, calcium sulfate, bassanite, LIBS, hydrogen, 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 Optische Technologien und Anwendungen, R - Robotische Exploration (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems
Deposited By: Schröder, Susanne
Deposited On:22 Dec 2016 15:40
Last Modified:22 Dec 2016 15:40

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