气候变化领域集成服务门户(CCPortal): Phase-Field Modeling of Reaction-Driven Cracking: Determining Conditions for Extensive Olivine Serpentinization

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DOI	10.1029/2019JB018614
	Phase-Field Modeling of Reaction-Driven Cracking: Determining Conditions for Extensive Olivine Serpentinization
	Evans O.; Spiegelman M.; Kelemen P.B.
发表日期	2020
ISSN	21699313
卷号	125 期号:1
英文摘要	The motion of plates leads to cycling of chemically bound water and volatiles through the Earth's interior, having consequences for arc magmatism and seismic activity at subduction zones. Tectonically exhumed peridotite at the Earth's surface provides a substantial sink for water and carbon. The natural chemical disequilibrium that exists between exposed mantle peridotite and the surface waters/atmosphere could potentially be harnessed as a negative carbon emission technology. Understanding this process is therefore critical from both a petrological and environmental perspective. Retrograde metamorphism is physically complex, potentially involving an interplay between positive (cracking) and negative (clogging) feedbacks that may limit, or promote, fluid supply to unreacted minerals. Modeling studies are important in helping to constrain the conditions that control the extent of reaction in ultramafic rocks. This study builds on a previously reported model that describes olivine hydration/carbonation in a poroelastic medium, coupling fluid flow, elastic deformation, and mass transfer between chemically active phases. Here we extend this model to include brittle failure, which is crucial given the widely held hypothesis that reaction-driven cracking is the dominant positive feedback in these processes. Here we explore the use of phase-field methods to simulate brittle failure in a poroelastic medium, in the context of hydration (serpentinization) of peridotite. We show that reaction-driven cracking in this model can generate a positive feedback that, under certain conditions, can lead to 100% transformation of olivine to serpentine. ©2019. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/188026
作者单位	Department of Applied Physics and Applied Mathematics, Columbia University, Columbia, NY, United States; Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States; Department of Earth and Environmental Sciences, Columbia UniversityNY, United States
推荐引用方式 GB/T 7714	Evans O.,Spiegelman M.,Kelemen P.B.. Phase-Field Modeling of Reaction-Driven Cracking: Determining Conditions for Extensive Olivine Serpentinization[J],2020,125(1).
APA	Evans O.,Spiegelman M.,&Kelemen P.B..(2020).Phase-Field Modeling of Reaction-Driven Cracking: Determining Conditions for Extensive Olivine Serpentinization.Journal of Geophysical Research: Solid Earth,125(1).
MLA	Evans O.,et al."Phase-Field Modeling of Reaction-Driven Cracking: Determining Conditions for Extensive Olivine Serpentinization".Journal of Geophysical Research: Solid Earth 125.1(2020).