NDLI: Oxidation of manganese at kimberley, gale crater: more free oxygen in mars' past?

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Oxidation of manganese at kimberley, gale crater: more free oxygen in mars' past?

Content Provider	NASA Technical Reports Server (NTRS)
Author	McLennan, S. M. Fischer, W. W. Rice, M. S. Morris, R. V. Bridges, N. T. Fabre, C. Ming, D. W. Fisk, M. R. Wiens, R. C. Bell II, J. F. Cousin, A. Hurowitz, J. A. Clegg, S. M. Gellert, R. Arvidson, R. E. Edgett, K. S. Calef II, F. Forni, O. Blaney, D. L. Berger, J. A. Grotzinger, J. P. Clark, B. C. Frydenvang, J. Campbell, J. L. Lanza, N. L.
Copyright Year	2015
Description	High Mn concentrations provide unique indicators of water-rich environments and their redox state. Very high-potential oxidants are required to oxidize Mn to insoluble, high-valence oxides that can precipitate and concentrate Mn in rocks and sediments; these redox potentials are much higher than those needed to oxidize Fe or S. Consequently, Mn-rich rocks on Earth closely track the rise of atmospheric oxygen. Given the association between Mn-rich rocks and the redox state of surface environments, observations of anomalous Mn enrichments on Mars raise similar questions about redox history, solubility and aqueous transport, and availability as a metabolic substrate. Our observations suggest that at least some of the high Mn present in Gale crater occurs in the form of Mn-oxides filling veins that crosscut sand-stones, requiring post-depositional precipitation as highly oxidizing fluids moved through the fractured strata after their deposition and lithification.
File Size	413900
Page Count	2
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20150002842
Archival Resource Key	ark:/13960/t3gx99s2p
Language	English
Publisher Date	2015-03-16
Access Restriction	Open
Subject Keyword	Lunar And Planetary Science And Exploration In Situ Measurement Oxygen Mars Planet Geochemistry Igneous Rocks Mars Surface Samples Substrates Oxidizers Soil Sampling Manganese Oxides Precipitation Chemistry Planetary Geology Mars Craters Rocks Oxidation Oxidation-reduction Reactions Deposition Manganese Half Life Mars Roving Vehicles Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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