globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.06.015
Scopus记录号: 2-s2.0-85048771205
论文题名:
Photochemical controls on chlorine and bromine geochemistry at the Martian surface
作者: Zhao Y.-Y.S.; McLennan S.M.; Jackson W.A.; Karunatillake S.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 497
起始页码: 102
结束页码: 112
语种: 英语
英文关键词: bromate ; halogen ; Mars ; perchlorate ; photochemistry ; sulfate
Scopus关键词: Chlorine compounds ; Geochemistry ; Inorganic compounds ; Photochemical reactions ; Silica ; Sulfur compounds ; bromate ; halogen ; Mars ; perchlorate ; sulfate ; Chlorine
英文摘要: 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 (ClO−4), chlorate (ClO−3), and bromate (BrO−3) 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. © 2018
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109769
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Department of Geosciences, Stony Brook University, Stony Brook, NY 11794-2100, United States; Department of Civil Engineering, Texas Tech University, Lubbock, TX 79409-1022, United States; Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, United States; Center for Lunar and Planetary Sciences, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou Province 550081, China

Recommended Citation:
Zhao Y.-Y.S.,McLennan S.M.,Jackson W.A.,et al. Photochemical controls on chlorine and bromine geochemistry at the Martian surface[J]. Earth and Planetary Science Letters,2018-01-01,497
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