气候变化领域集成服务门户(CCPortal): Caribbean plate tilted and actively dragged eastwards by low-viscosity asthenospheric flow

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DOI	10.1038/s41467-021-21723-1
	Caribbean plate tilted and actively dragged eastwards by low-viscosity asthenospheric flow
	Chen Y.-W.; Colli L.; Bird D.E.; Wu J.; Zhu H.
发表日期	2021
ISSN	2041-1723
卷号	12 期号:1
英文摘要	The importance of a low-viscosity asthenosphere underlying mobile plates has been highlighted since the earliest days of the plate tectonics revolution. However, absolute asthenospheric viscosities are still poorly constrained, with estimates spanning up to 3 orders of magnitude. Here we follow a new approach using analytic solutions for Poiseuille-Couette channel flow to compute asthenospheric viscosities under the Caribbean. We estimate Caribbean dynamic topography and the associated pressure gradient, which, combined with flow velocities estimated from geologic markers and tomographic structure, yield our best-estimate asthenospheric viscosity of (3.0 ± 1.5)*1018 Pa s. This value is consistent with independent estimates for non-cratonic and oceanic regions, and challenges the hypothesis that higher-viscosity asthenosphere inferred from postglacial rebound is globally-representative. The active flow driven by Galapagos plume overpressure shown here contradicts the traditional view that the asthenosphere is only a passive lubricating layer for Earth’s tectonic plates. © 2021, The Author(s).
语种	英语
scopus关键词	asthenosphere; Caribbean plate; channel flow; flow velocity; plate tectonics; Postglacial; postglacial rebound; tilt; tomography; topography; viscosity; Article; asthenospheric upwelling; Caribbean Islands; dynamics; flow rate; oceanic regions; pressure gradient; topography; viscosity; oceanic regions
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250745
作者单位	Department of Earth and Atmospheric Science, University of Houston, Houston, United States; Bird Geophysical, Houston, United States; Department of Geosciences, University of Texas at Dallas, Richardson, United States
推荐引用方式 GB/T 7714	Chen Y.-W.,Colli L.,Bird D.E.,et al. Caribbean plate tilted and actively dragged eastwards by low-viscosity asthenospheric flow[J],2021,12(1).
APA	Chen Y.-W.,Colli L.,Bird D.E.,Wu J.,&Zhu H..(2021).Caribbean plate tilted and actively dragged eastwards by low-viscosity asthenospheric flow.Nature Communications,12(1).
MLA	Chen Y.-W.,et al."Caribbean plate tilted and actively dragged eastwards by low-viscosity asthenospheric flow".Nature Communications 12.1(2021).