Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 497, Issue -, Pages 102-112Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.epsl.2018.06.015
Keywords
halogen; Mars; photochemistry; bromate; perchlorate; sulfate
Categories
Funding
- NASA Mars Fundamental Research Program [NNX11AM30G]
- Mars Data Analysis Program [NNX11AI94G]
- Mars Data Analysis Program grant [NNX12AG89G/NNX13AI98G]
- LaSpace Research Enhancement Award
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Widely distributed perchlorate on the Martian surface and over three orders of magnitude variation in bromine abundances in surface samples are difficult to explain solely by chloride and bromide aqueous geochemistry. New experiments show that photochemical oxidation (ultraviolet wavelength 254 nm) of chloride- and bromide-bearing evaporative brines in the presence of silica beads produces substantial perchlorate (ClO4-), chlorate (ClO3-), and bromate (BrO3-) under conditions relevant to Mars. Neutral to alkaline aqueous environments result in the dominance of chlorate over perchlorate. Preferential atmospheric recycling of Br over Cl causes variable Br/Cl ratios, consistent with numerous in-situ measurements of Cl and Br abundances on Mars. Bromate reacts with organics more readily than chlorate or perchlorate, and its presence in subsurface brines could challenge habitability in the Martian subsurface. (C) 2018 Elsevier B.V. All rights reserved.
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