气候变化领域集成服务门户(CCPortal): Deep abiotic weathering of pyrite

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DOI	10.1126/science.abb8092
	Deep abiotic weathering of pyrite
	Gu X.; Heaney P.J.; Reis F.D.A.A.; Brantley S.L.
发表日期	2020
ISSN	0036-8075
卷号	370 期号:6515
英文摘要	Pyrite is a ubiquitous iron sulfide mineral that is oxidized by trace oxygen. The mineral has been largely absent from global sediments since the rise in oxygen concentration in Earth's early atmosphere. We analyzed weathering in shale, the most common rock exposed at Earth's surface, with chemical and microscopic analysis. By looking across scales from 10-9 to 102 meters, we determined the factors that control pyrite oxidation. Under the atmosphere today, pyrite oxidation is rate-limited by diffusion of oxygen to the grain surface and regulated by large-scale erosion and clast-scale fracturing. We determined that neither iron- nor sulfur-oxidizing microorganisms control global pyrite weathering fluxes despite their ability to catalyze the reaction. This multiscale picture emphasizes that fracturing and erosion are as important as atmospheric oxygen in limiting pyrite reactivity over Earth's history. © 2020 American Association for the Advancement of Science. All rights reserved.
英文关键词	ferric hydroxide; iron oxide; oxygen; pyrite; abiotic factor; concentration (composition); diffusion; iron sulfide; microbial activity; microstructure; oxidation; pyrite; rock microstructure; sediment analysis; trace element; weathering rate; catalysis; catalyst; grain size; trace gas; weathering; abiotic stress; Article; catchment area (hydrology); chemical reaction kinetics; concentration (parameter); controlled study; density; electron diffraction; environmental erosion; environmental exposure; high resolution transmission electron microscopy; microbial activity; microorganism; nonhuman; oxidation; porosity; priority journal; scanning transmission electron microscopy; stoichiometry; weathering; acidification; catalysis; catchment area; diffusion; land use; scanning electron microscopy; surface property; transmission electron microscopy
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/243889
作者单位	Department of Geosciences, Pennsylvania State University, University Park, PA 16802, United States; Instituto de Física, Universidade Federal Fluminense, Avenida Litorânea s/n, Niterói, RJ, 24210-340, Brazil; Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA 16802, United States
推荐引用方式 GB/T 7714	Gu X.,Heaney P.J.,Reis F.D.A.A.,et al. Deep abiotic weathering of pyrite[J],2020,370(6515).
APA	Gu X.,Heaney P.J.,Reis F.D.A.A.,&Brantley S.L..(2020).Deep abiotic weathering of pyrite.Science,370(6515).
MLA	Gu X.,et al."Deep abiotic weathering of pyrite".Science 370.6515(2020).