DOI: 10.1038/ngeo2711
论文题名: Mountain building on Io driven by deep faulting
作者: Bland M.T. ; Mckinnon W.B.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期: 6 起始页码: 429
结束页码: 432
语种: 英语
Scopus关键词: fault propagation
; finite element method
; mountain
; orogeny
; planetary landform
; relief
; solar system
; subsidence
; tectonic setting
; thermoelasticity
; thrust fault
; viscoplasticity
; volcanism
英文摘要: Jupiter's volcanic moon Io possesses some of the highest relief in the Solar System: massive, isolated mountain blocks that tower up to 17 km above the surrounding plains. These mountains are likely to result from pervasive compressive stresses induced by subsidence of the surface beneath the near-continual emplacement of volcanic material. The stress state that results from subsidence and warming of Io's lithosphere has been investigated in detail; however, the mechanism of orogenesis itself and its effect on regional tectonism and volcanism has not been firmly established. Here we present viscoelastic-plastic finite element simulations demonstrating that Io's mountains form along deep-seated thrust faults that initiate at the base of the lithosphere and propagate upward. We show that faulting fundamentally alters the stress state of Io's lithosphere by relieving the large volcanism-induced subsidence stresses. Notably, in the upper portion of the lithosphere, stresses become tensile (near-zero differential stress). A number of processes are therefore altered post-faulting, including magma transport through the lithosphere, interactions with tidal stresses and potentially the localization of mountain formation by thermoelastic stresses. We conclude that Io's mountains form by a unique orogenic mechanism, compared with tectonic processes operating elsewhere in the Solar System. © 2016 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105992
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: US Geological Survey, Astrogeology Science Center, 2255 N. Gemini Drive, Flagsta, AZ, United States; Department of Earth and Planetary Sciences, McDonnell Center for the Space Sciences, Washington University in St Louis, Saint Louis, MO, United States
Recommended Citation:
Bland M.T.,Mckinnon W.B.. Mountain building on Io driven by deep faulting[J]. Nature Geoscience,2016-01-01,9(6)