干旱区生态环境知识资源中心(Arid): Prolonged Fluvial Activity From Channel-Fan Systems on Mars

Arid

DOI	10.1029/2019JE006167
	Prolonged Fluvial Activity From Channel-Fan Systems on Mars
	de Quay, Gaia Stucky 1,2,3; Kite, Edwin S.1; Mayer, David P.1,4
通讯作者	de Quay, Gaia Stucky
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
ISSN	2169-9097
EISSN	2169-9100
出版年	2019
卷号	124 期号:11 页码:3119-3139
英文摘要	Alluvial fans on Mars, which are primarily sourced from erosional alcoves incised into crater rims, record a period of increased surface runoff which ended >1 Ga. However, we lack quantitative constraints on the frequency and duration of river-forming processes and the climatic conditions that accompanied these long-term habitable episodes. Here we use bedrock erosion and sediment transport models to show that the cumulative time span of wet activity (i.e., nonzero erosion and deposition) was between 100 years to 1 Myr excluding dry years. We use Context Camera (CTX) digital elevation models to compile a data set of >200 channels upstream of depositional fans and determine key fluvial geometry metrics. Results from calculating Mars stream power parameters are compared to great escarpment channels and globally distributed bedrock rivers on Earth. Although Martian channel profile morphologies fall within the range of those on Earth, they are slightly less concave-up (concavity index, theta?chi=0.35 +/- 0.16) and steeper for a given drainage area (reference steepness index, k?s,chi=0.09 +/- 0.03, for reference drainage area, A(r) = 1 x10(7) m(2)). Timescales depend strongly on poorly constrained variables such as erodability and grain size. Channel morphologies, intermittencies, spatial distributions, and orientations collectively suggest an arid climate and a source from snowmelt on steep crater rims, possibly from obliquity-paced insolation variations or orographic accumulation. Derived timescales are consistent with erosion rates and intermittencies observed in arid environments on Earth and do not support short-lived or catastrophic triggers for the warm climate conditions (such as impacts or individual volcanic eruptions).
英文关键词	Mars fluvial timescale erosion sediment transport alluvial fan
类型	Article
语种	英语
国家	USA ; England
收录类别	SCI-E
WOS记录号	WOS:000499483100001
WOS关键词	BEDROCK RIVER INCISION ; LARGE ALLUVIAL FANS ; STREAM-POWER ; GALE CRATER ; LONGITUDINAL PROFILES ; CLIMATIC CONTROL ; LANDSCAPE ; EVOLUTION ; CONCAVITY ; SEDIMENT
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
EI主题词	2019-11-30
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311020
作者单位	1.Univ Chicago, Dept Geophys Sci, 5734 S Ellis Ave, Chicago, IL 60637 USA; 2.Imperial Coll London, Dept Earth Sci & Engn, London, England; 3.Univ Texas Austin, Dept Geol Sci, Austin, TX 78712 USA; 4.USGS Flagstaff, Flagstaff, AZ USA
推荐引用方式 GB/T 7714	de Quay, Gaia Stucky,Kite, Edwin S.,Mayer, David P.. Prolonged Fluvial Activity From Channel-Fan Systems on Mars[J],2019,124(11):3119-3139.
APA	de Quay, Gaia Stucky,Kite, Edwin S.,&Mayer, David P..(2019).Prolonged Fluvial Activity From Channel-Fan Systems on Mars.JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS,124(11),3119-3139.
MLA	de Quay, Gaia Stucky,et al."Prolonged Fluvial Activity From Channel-Fan Systems on Mars".JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS 124.11(2019):3119-3139.