Feedbacks among O₂ and CO₂ in deep soil gas, oxidation of ferrous minerals, and fractures: A hypothesis for steady-state regolith thickness

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• 作者：Hyojin Kim^a ; ^{hxk31@psu.edu} ; Gary Stinchcomb^b ; Susan L. Brantley^a
• 关键词：soil pO2 and pCO2 ; mafic vs. felsic bedrocks ; weathering-induced fracturing ; Fe redox cycling ; regolith development
• 刊名：Earth and Planetary Science Letters
• 出版年：2017
• 出版时间：15 February 2017
• 年：2017
• 卷：460
• 期：Complete
• 页码：29-40
• 全文大小：3475 K
• 卷排序：460

文摘

Aerobic condition at depth year-round in fractured or Fe(II)-poor lithologies. Seasonal cycle of redox conditions in more massive and Fe(II)-rich lithology. Fractures and lithology may be first order controls on regolith gas chemistry. Feedbacks between Fe(II)-mineral oxidation and pO2 may contribute regolith evolution. Critical role of soil biota in the negative feedback by limiting O2 in deep regolith.