Photochemical controls on chlorine and bromine geochemistry at the Martian surface | |
Yu-Yan Sara Zhao; Scott M. McLennan; W. Andrew Jackson; Suniti Karunatillake | |
2018 | |
发表期刊 | Earth and Planetary Science Letters |
卷号 | 497页码:102–112 |
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 (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. |
关键词 | Halogen Mars Photochemistry Bromate Perchlorate Sulfate |
收录类别 | SCI |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.gyig.ac.cn/handle/42920512-1/8842 |
专题 | 矿床地球化学国家重点实验室 |
作者单位 | 1.Department of Geosciences, Stony Brook University, Stony Brook, NY 11794-2100, USA 2.Department of Civil Engineering, Texas Tech University, Lubbock, TX 79409-1022, USA 3.Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, USA |
推荐引用方式 GB/T 7714 | Yu-Yan Sara Zhao;Scott M. McLennan;W. Andrew Jackson;Suniti Karunatillake. Photochemical controls on chlorine and bromine geochemistry at the Martian surface[J]. Earth and Planetary Science Letters,2018,497:102–112. |
APA | Yu-Yan Sara Zhao;Scott M. McLennan;W. Andrew Jackson;Suniti Karunatillake.(2018).Photochemical controls on chlorine and bromine geochemistry at the Martian surface.Earth and Planetary Science Letters,497,102–112. |
MLA | Yu-Yan Sara Zhao;Scott M. McLennan;W. Andrew Jackson;Suniti Karunatillake."Photochemical controls on chlorine and bromine geochemistry at the Martian surface".Earth and Planetary Science Letters 497(2018):102–112. |
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Photochemical contro(1154KB) | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | 浏览 请求全文 |
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