气候变化领域集成服务门户(CCPortal): Synergy of Experimental Rock Mechanics, Seismology, and Geodynamics Reveals Still Elusive Upper Mantle Rheology

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DOI	10.1029/2020JB019896
	Synergy of Experimental Rock Mechanics, Seismology, and Geodynamics Reveals Still Elusive Upper Mantle Rheology
	Jain C.; Korenaga J.
发表日期	2020
ISSN	21699313
卷号	125 期号:11
英文摘要	We present a novel geodynamic approach that can potentially tighten existing constraints on mantle rheology. This new approach, which we call probabilistic geodynamic modeling, is applied here to the rheology of the upper mantle. We combine the numerical modeling of plate-driven corner flow and the seismic observation of radial anisotropy, aiming to reduce substantial uncertainties associated with experimentally derived flow laws, but our results also highlight the complex competition among different deformation mechanisms under mantle conditions. Despite the remaining rheological uncertainty, our study suggests that significant background shear flow is required near the lithosphere-asthenosphere boundary to explain the strong radial anisotropy observed at 100–200 km depth underneath the Pacific plate, and the plausible nature of this background flow is characterized using our new probabilistic approach. Our analysis also provides a new insight into the asthenospheric water content and the grain size distribution in the upper mantle, but these results are also subject to nontrivial nonuniqueness. The merit of our probabilistic approach lies in its ability to assess the extent of such nonuniqueness, and we demonstrate this by quantifying the robustness of some of our results. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	composite flow law; olivine rheology; probabilistic geodynamic modeling; radial anisotropy; shear flow under the Pacific plate
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/187514
作者单位	Department of Earth and Planetary Sciences, Yale University, New Haven, CT, United States; Department of Earth and Planetary Sciences, Washington University in St. Louis, St. Louis, MO, United States
推荐引用方式 GB/T 7714	Jain C.,Korenaga J.. Synergy of Experimental Rock Mechanics, Seismology, and Geodynamics Reveals Still Elusive Upper Mantle Rheology[J],2020,125(11).
APA	Jain C.,&Korenaga J..(2020).Synergy of Experimental Rock Mechanics, Seismology, and Geodynamics Reveals Still Elusive Upper Mantle Rheology.Journal of Geophysical Research: Solid Earth,125(11).
MLA	Jain C.,et al."Synergy of Experimental Rock Mechanics, Seismology, and Geodynamics Reveals Still Elusive Upper Mantle Rheology".Journal of Geophysical Research: Solid Earth 125.11(2020).