Iron and oxygen isotope fractionation during iron UV photo-oxidation: Implications for early Earth and Mars

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• 作者：Nicole X. Nie^a ; ^{xike@uchicago.edu} ; Nicolas Dauphas^a ; Richard C. Greenwood^b
• 关键词：photo-oxidation ; iron isotopes ; oxygen isotopes ; mass fractionation law ; banded iron formations ; martian jarosite&ndash ; hematite deposits
• 刊名：Earth and Planetary Science Letters
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：458
• 期：Complete
• 页码：179-191
• 全文大小：1196 K
• 卷排序：458

文摘

We performed UV photo-oxidation experiments and measured Fe and O isotopes. Fe isotopes follow a Rayleigh distillation (ΔFe(III)precipitate–Fe(II)56/54=+1.2‰). The slope in a 3-isotope diagram for Fe follows the high-T equilibrium limit. Photo-oxidation can explain the precipitation of BIFs. Photo-oxidation is a viable process to form Fe(III)-minerals on Mars.