DOI: 10.1002/2017JE005460
Scopus记录号: 2-s2.0-85044000945
论文题名: Wind-Driven Erosion and Exposure Potential at Mars 2020 Rover Candidate-Landing Sites
作者: Chojnacki M. ; Banks M. ; Urso A.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 2 起始页码: 468
结束页码: 488
语种: 英语
英文关键词: eolian erosion
; exposure ages
; future landing sites
; Mars
; sand fluxes
Scopus关键词: Phymata
英文摘要: Aeolian processes have likely been the predominant geomorphic agent for most of Mars' history and have the potential to produce relatively young exposure ages for geologic units. Thus, identifying local evidence for aeolian erosion is highly relevant to the selection of landing sites for future missions, such as the Mars 2020 Rover mission that aims to explore astrobiologically relevant ancient environments. Here we investigate wind-driven activity at eight Mars 2020 candidate-landing sites to constrain erosion potential at these locations. To demonstrate our methods, we found that contemporary dune-derived abrasion rates were in agreement with rover-derived exhumation rates at Gale crater and could be employed elsewhere. The Holden crater candidate site was interpreted to have low contemporary erosion rates, based on the presence of a thick sand coverage of static ripples. Active ripples at the Eberswalde and southwest Melas sites may account for local erosion and the dearth of small craters. Moderate-flux regional dunes near Mawrth Vallis were deemed unrepresentative of the candidate site, which is interpreted to currently be experiencing low levels of erosion. The Nili Fossae site displayed the most unambiguous evidence for local sand transport and erosion, likely yielding relatively young exposure ages. The downselected Jezero crater and northeast Syrtis sites had high-flux neighboring dunes and exhibited substantial evidence for sediment pathways across their ellipses. Both sites had relatively high estimated abrasion rates, which would yield young exposure ages. The downselected Columbia Hills site lacked evidence for sand movement, and contemporary local erosion rates are estimated to be relatively low. ©2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114579
Appears in Collections: 气候减缓与适应
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作者单位: Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States
Recommended Citation:
Chojnacki M.,Banks M.,Urso A.. Wind-Driven Erosion and Exposure Potential at Mars 2020 Rover Candidate-Landing Sites[J]. Journal of Geophysical Research: Planets,2018-01-01,123(2)