DOI: 10.1038/s41561-020-0618-x
论文题名: Valley formation on early Mars by subglacial and fluvial erosion
作者: Grau Galofre A. ; Jellinek A.M. ; Osinski G.R.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 10 起始页码: 663
结束页码: 668
语种: 英语
英文关键词: geological record
; geomorphology
; groundwater
; ice sheet
; Mars
; paleoclimate
; runoff
; subglacial environment
; surface water
; valley
英文摘要: The southern highlands of Mars are dissected by hundreds of valley networks, which are evidence that water once sculpted the surface. Characterizing the mechanisms of valley incision may constrain early Mars climate and the search for ancient life. Previous interpretations of the geological record require precipitation and surface water runoff to form the valley networks, in contradiction with climate simulations that predict a cold, icy ancient Mars. Here we present a global comparative study of valley network morphometry, using a principal-component-based analysis with physical models of fluvial, groundwater sapping and glacial and subglacial erosion. We found that valley formation involved all these processes, but that subglacial and fluvial erosion are the predominant mechanisms. This is supported by predictions from models of steady-state erosion and geomorphological comparisons to terrestrial analogues. The inference of subglacial channels among the valley networks supports the presence of ice sheets that covered the southern highlands during the time of valley network emplacement. © 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/169602
Appears in Collections: 气候变化与战略
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作者单位: Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada; School of Earth and Space Exploration, Arizona State University, Tempe, AZ, United States; Department of Earth Sciences, University of Western Ontario, London, ON, Canada; Institute for Earth and Space Exploration, University of Western Ontario, London, ON, Canada
Recommended Citation:
Grau Galofre A.,Jellinek A.M.,Osinski G.R.. Valley formation on early Mars by subglacial and fluvial erosion[J]. Nature Geoscience,2020-01-01,13(10)