气候变化领域集成服务门户(CCPortal): Corona structures driven by plume–lithosphere interactions and evidence for ongoing plume activity on Venus

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DOI	10.1038/s41561-020-0606-1
	Corona structures driven by plume–lithosphere interactions and evidence for ongoing plume activity on Venus
	Gülcher A.J.P.; Gerya T.V.; Montési L.G.J.; Munch J.
发表日期	2020
ISSN	17520894
起始页码	547
结束页码	554
卷号	13 期号:8
英文摘要	In the absence of global plate tectonics, mantle convection and plume–lithosphere interaction are the main drivers of surface deformation on Venus. Among documented tectonic structures, circular volcano-tectonic features known as coronae may be the clearest surface manifestations of mantle plumes and hold clues to the global Venusian tectonic regime. Yet, the exact processes underlying coronae formation and the reasons for their diverse morphologies remain controversial. Here we use three-dimensional thermomechanical numerical simulations of impingement of a thermal mantle plume on the Venusian lithosphere to assess the origin and diversity of large Venusian coronae. The ability of the mantle plume to penetrate into the Venusian lithosphere results in four main outcomes: lithospheric dripping, short-lived subduction, embedded plume and plume underplating. During the first three scenarios, plume penetration and spreading induce crustal thickness variations that eventually lead to a final topographic isostasy-driven topographic inversion from circular trenches surrounding elevated interiors to raised rims surrounding inner depressions, as observed on many Venusian coronae. Different corona structures may represent not only different styles of plume–lithosphere interactions but also different stages in evolution. A morphological analysis of large existing coronae leads to the conclusion that at least 37 large coronae (including the largest Artemis corona) are active, providing evidence for widespread ongoing plume activity on Venus. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	continental lithosphere; corona; crustal deformation; crustal thickness; mantle convection; mantle plume; plate tectonics; topography; Venus; Venusia
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206780
作者单位	Institute of Geophysics, Department of Earth Sciences, ETH Zürich, Zürich, Switzerland; Department of Geology, University of Maryland, College Park, MD, United States
推荐引用方式 GB/T 7714	Gülcher A.J.P.,Gerya T.V.,Montési L.G.J.,等. Corona structures driven by plume–lithosphere interactions and evidence for ongoing plume activity on Venus[J],2020,13(8).
APA	Gülcher A.J.P.,Gerya T.V.,Montési L.G.J.,&Munch J..(2020).Corona structures driven by plume–lithosphere interactions and evidence for ongoing plume activity on Venus.Nature Geoscience,13(8).
MLA	Gülcher A.J.P.,et al."Corona structures driven by plume–lithosphere interactions and evidence for ongoing plume activity on Venus".Nature Geoscience 13.8(2020).