DOI: 10.1038/ngeo2928
论文题名: Experimental and observational evidence for plume-induced subduction on Venus
作者: Davaille A. ; Smrekar S.E. ; Tomlinson S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 5 起始页码: 349
结束页码: 355
语种: 英语
Scopus关键词: deformation mechanism
; early Earth
; flooding
; lithosphere
; mantle plume
; plate tectonics
; subduction
; subduction zone
; upwelling
; Venus
英文摘要: Why Venus lacks plate tectonics remains an unanswered question in terrestrial planet evolution. There is observational evidence for subduction - a requirement for plate tectonics - on Venus, but it is unclear why the features have characteristics of both mantle plumes and subduction zones. One explanation is that mantle plumes trigger subduction. Here we compare laboratory experiments of plume-induced subduction in a colloidal solution of nanoparticles to observations of proposed subduction sites on Venus. The experimental fluids are heated from below to produce upwelling plumes, which in turn produce tensile fractures in the lithosphere-like skin that forms on the upper surface. Plume material upwells through the fractures and spreads above the skin, analogous to volcanic flooding, and leads to bending and eventual subduction of the skin along arcuate segments. The segments are analogous to the semi-circular trenches seen at two proposed sites of plume-triggered subduction at Quetzalpetlatl and Artemis coronae. Other experimental deformation structures and subsurface density variations are also consistent with topography, radar and gravity data for Venus. Scaling analysis suggests that this regime with limited, plume-induced subduction is favoured by a hot lithosphere, such as that found on early Earth or present-day Venus. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105786
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Laboratoire FAST, CNRS/Univ., Paris-Sud/Université Paris-Saclay, Orsay, France; Jet Propulsion Laboratory/Caltech, 4800 Oak Grove Drive, Pasadena, CA, United States; Earth, Planetary, and Space Sciences, University of California Los Angeles, Los Angeles, CA, United States
Recommended Citation:
Davaille A.,Smrekar S.E.,Tomlinson S.. Experimental and observational evidence for plume-induced subduction on Venus[J]. Nature Geoscience,2017-01-01,10(5)