DOI: 10.1038/s41561-017-0012-5
论文题名: Granular flows at recurring slope lineae on Mars indicate a limited role for liquid water
作者: Dundas C.M. ; McEwen A.S. ; Chojnacki M. ; Milazzo M.P. ; Byrne S. ; McElwaine J.N. ; Urso A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 12 起始页码: 903
结束页码: 907
语种: 英语
Scopus关键词: cohesionless sediment
; formation mechanism
; geomorphology
; granular medium
; gully
; liquid
; Mars
; slope dynamics
; topography
; water flow
英文摘要: Recent liquid water flow on Mars has been proposed based on geomorphological features, such as gullies. Recurring slope lineae - seasonal flows that are darker than their surroundings - are candidate locations for seeping liquid water on Mars today, but their formation mechanism remains unclear. Topographical analysis shows that the terminal slopes of recurring slope lineae match the stopping angle for granular flows of cohesionless sand in active Martian aeolian dunes. In Eos Chasma, linea lengths vary widely and are longer where there are more extensive angle-of-repose slopes, inconsistent with models for water sources. These observations suggest that recurring slope lineae are granular flows. The preference for warm seasons and the detection of hydrated salts are consistent with some role for water in their initiation. However, liquid water volumes may be small or zero, alleviating planetary protection concerns about habitable environments. © 2017 The Publisher. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105657
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, Flagstaff, AZ, United States; University of Arizona, Lunar and Planetary Laboratory, Tucson, AZ, United States; Department of Earth Sciences, Durham University, Durham, United Kingdom; Planetary Science Institute, Tucson, AZ, United States
Recommended Citation:
Dundas C.M.,McEwen A.S.,Chojnacki M.,et al. Granular flows at recurring slope lineae on Mars indicate a limited role for liquid water[J]. Nature Geoscience,2017-01-01,10(12)