DOI: 10.1038/s41561-020-0606-1
论文题名: Corona structures driven by plume–lithosphere interactions and evidence for ongoing plume activity on Venus
作者: Gülcher A.J.P. ; Gerya T.V. ; Montési L.G.J. ; Munch J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 8 起始页码: 547
结束页码: 554
语种: 英语
英文关键词: continental lithosphere
; corona
; crustal deformation
; crustal thickness
; mantle convection
; mantle plume
; plate tectonics
; topography
; Venus
; Venusia
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169604
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Gülcher A.J.P.,Gerya T.V.,Montési L.G.J.,et al. Corona structures driven by plume–lithosphere interactions and evidence for ongoing plume activity on Venus[J]. Nature Geoscience,2020-01-01,13(8)