DOI: 10.1002/2017JE005396
Scopus记录号: 2-s2.0-85040237267
论文题名: The Generation of Barriers to Melt Ascent in the Martian Lithosphere
作者: Schools J.W. ; Montési L.G.J.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 1 起始页码: 47
结束页码: 66
语种: 英语
英文关键词: Mars
; melt transport
; MELTS
; permeability barrier
Scopus关键词: mantle structure
; Mars
; melt
; permeability
; planetary landform
; porosity
; strain rate
; transport process
; viscosity
; volcanism
英文摘要: Planetary mantles can be regarded as an aggregate of two phases: a solid, porous matrix and a liquid melt. Melt travels rapidly upward through the matrix due to its buoyancy. When this melt enters the colder lithosphere, it begins to crystallize. If crystallization happens at a high rate, the newly formed crystals can clog the pore space, reducing its permeability to essentially zero. This zone of zero permeability is the permeability barrier. We use the MELTS family of thermodynamic calculators to determine melt compositions and the crystallization sequence of ascending melt throughout Martian history and simulate the formation of permeability barriers. At lower strain rates (10−17–10−15 s−1) permeability barriers form deep in the lithosphere, possibly contributing to the formation of localized volcanic edifices on the Martian surface once fracturing or thermal erosion enables melt to traverse the lithosphere. Higher strain rates (10−13 s−1) yield shallower permeability barriers, perhaps producing extensive lava flows. Permeability barrier formation is investigated using an anhydrous mantle source or mantle sources that include up to 1,000 ppm H2O. Introducing even small amounts of water (25 ppm H2O) reduces mantle viscosity in a manner similar to increasing the strain rate and results in a shallower barrier than in the anhydrous case. Large amounts of water (1,000 ppm H2O) yield very shallow weak barriers or no barriers at all. The depth of the permeability barrier has evolved through time, likely resulting in a progression in the style of surface volcanism from widespread flows to massive, singular volcanoes. ©2017. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114850
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geology, University of Maryland, College Park, MD, United States
Recommended Citation:
Schools J.W.,Montési L.G.J.. The Generation of Barriers to Melt Ascent in the Martian Lithosphere[J]. Journal of Geophysical Research: Planets,2018-01-01,123(1)