气候变化领域集成服务门户(CCPortal): Compaction-Driven Fluid Localization as an Explanation for Lower Crustal Electrical Conductors in an Intracontinental Setting

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DOI	10.1029/2020GL088455
	Compaction-Driven Fluid Localization as an Explanation for Lower Crustal Electrical Conductors in an Intracontinental Setting
	Comeau M.J.; Becken M.; Connolly J.A.D.; Grayver A.V.; Kuvshinov A.V.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:19
英文摘要	We present electrical resistivity models, derived from magnetotelluric data, of the crust beneath the Bulnay region, Mongolia. They reveal that the lower crust contains a pattern of discrete zones (width of ~25 km) of low resistivity (<30 Ωm). Such features may be an effect of unaccounted-for electrical anisotropy. However, when anisotropy is considered in the modeling, the features remain. We investigate an alternative explanation, based on a conceptual model of fluid localization and stagnation by thermally activated compaction, and demonstrate it is compatible with the observed low-resistivity zones. The model explains the location, shape, and size of the zones, with plausible values of the activation energy for lower crustal creep (270–360 kJ/mol), and a viscous compaction length on the order of 10 km. The results imply tectonic deformation and compaction processes, rather than lithological-structural heterogeneity, control the regional lower crustal fluid flow. ©2020. The Authors.
英文关键词	Activation energy; Anisotropy; Compaction; Lithology; Compaction process; Crustal fluid flow; Electrical anisotropy; Electrical conductors; Magnetotelluric data; Structural heterogeneity; Tectonic deformations; Thermally activated; Flow of fluids; activation energy; anisotropy; compaction; creep; crustal structure; deformation mechanism; electrical resistivity; fluid composition; lithology; lower crust; Mongolia
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169646
作者单位	Institut für Geophysik, Universität Münster, Münster, Germany; Institute für Geochemie und Petrologie, Swiss Federal Institute of Technology (ETH), Zürich, Switzerland; Institute of Geophysics, Swiss Federal Institute of Technology (ETH), Zurich, Switzerland
推荐引用方式 GB/T 7714	Comeau M.J.,Becken M.,Connolly J.A.D.,et al. Compaction-Driven Fluid Localization as an Explanation for Lower Crustal Electrical Conductors in an Intracontinental Setting[J],2020,47(19).
APA	Comeau M.J.,Becken M.,Connolly J.A.D.,Grayver A.V.,&Kuvshinov A.V..(2020).Compaction-Driven Fluid Localization as an Explanation for Lower Crustal Electrical Conductors in an Intracontinental Setting.Geophysical Research Letters,47(19).
MLA	Comeau M.J.,et al."Compaction-Driven Fluid Localization as an Explanation for Lower Crustal Electrical Conductors in an Intracontinental Setting".Geophysical Research Letters 47.19(2020).