干旱区生态环境知识资源中心(Arid): Deposition and erosion of a Light-Toned Yardang-forming unit of Mt Sharp, Gale crater, Mars

Arid

DOI	10.1016/j.epsl.2020.116681
	Deposition and erosion of a Light-Toned Yardang-forming unit of Mt Sharp, Gale crater, Mars
	Dromart, G.; Le Deit, L.; Rapin, W.; Gasnault, O.; Le Mouelic, S.; Quantin-Nataf, C.; Mangold, N.; Rubin, D.; Lasue, J.; Maurice, S.; Newsom, H. E.; Pinet, R.; Scuderi, L.; Wiens, R. C.
通讯作者	Dromart, G (corresponding author), Univ Lyon 1, LGL TPE, CNRS, ENSL,Univ Lyon, F-69364 Lyon, France.
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
ISSN	0012-821X
EISSN	1385-013X
出版年	2021
卷号	554
英文摘要	Gale crater is a large impact crater with a ca 5 km thick sequence of stratified rocks in it, expressed today as a central eroded mound (i.e., Aeolis Mons informally named Mt. Sharp). A goal of the current Mars Science Laboratory mission in Gale crater is to investigate the processes that deposited, lithified, and eroded this fill. The Light-Toned Yardang Unit (LTYu) unit, the subject of the present research, is one of the geological units of Mt Sharp. Our specific purpose here is to refine and interpret the imaging documentation of the morphologic and stratal components of the LTYu, at large outcrop scale. In combination with established orbital images, we use the Remote Micro-Imager (RMI) of ChemCam, a remote sensing instrument currently operated onboard Curiosity rover, which provides several types of context imaging. RMI capabilities now include Long Distance acquisitions of targets several kilometers away. In these new acquisitions, substantial differences are visible in LTYu yardang attitudes from lowest to uppermost elevations allowing tentative subdivision of the LTYu into subunits. Bedding geometries in the lower LTYu are consistent with eolian dune foresets which collectively prograde towards an average N134 degrees direction. Based on stratal architectures, the LTYu is viewed as an amalgamated stack of at least two, and possibly four, ancient erg systems bounded by large deflationary supersurfaces. Observations point to a multistory generation of yardangs interpreted to have been successively buried during the stratigraphic building of Mt Sharp. We conclude that the successive sequences of eolian deposition-erosion recorded by the LTYu have been generated by cyclic changes from semi-arid to arid conditions, coupled in climatic cycles, including wind regime change. The regional unconformity that tops the Lower mound formation of Mt Sharp, and the subsequent emplacement of the LTYu, collectively express a clear tendency toward sustained arid environments for this region of Mars around the Early - Late Hesperian transition. Given the large time scale involved (i.e., a few tens of million years as a minimum), we consider it likely that the local evidence for increased aridity in the Mt Sharp stratigraphy is a manifestation of climate change affecting the whole planet. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Mars climate Gale crater yardang stratigraphy Eolian ChemCam
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000604582500033
WOS关键词	EVOLUTION ; FEATURES ; DESERT ; STRATIGRAPHY ; SURFACES ; PLATEAU ; ROCKS ; MOUND ; BASIN
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/347806
作者单位	[Dromart, G.] Univ Lyon 1, LGL TPE, CNRS, ENSL,Univ Lyon, F-69364 Lyon, France; [Le Deit, L.; Le Mouelic, S.; Mangold, N.] Univ Nantes, LPG, CNRS, F-44322 Nantes, France; [Rapin, W.] CALTECH, GPS, Pasadena, CA 91125 USA; [Gasnault, O.; Lasue, J.; Maurice, S.; Pinet, R.] Univ Toulouse, IRAP, CNES, CNRS, F-31400 Toulouse, France; [Quantin-Nataf, C.] Univ Lyon, LGL TPE, CNRS, ENSL,Univ Lyon 1, F-69622 Villeurbanne, France; [Rubin, D.] Univ Calif Santa Cruz, Earth & Planetary Sci, Santa Cruz, CA 95064 USA; [Newsom, H. E.] Univ New Mexico, Inst Meteorit, Albuquerque, NM 87131 USA; [Scuderi, L.] Univ New Mexico, Dept Earth & Planetary Sci, Albuquerque, NM 87131 USA; [Wiens, R. C.] Los Alamos Natl Lab, Los Alamos, NM 87544 USA
推荐引用方式 GB/T 7714	Dromart, G.,Le Deit, L.,Rapin, W.,et al. Deposition and erosion of a Light-Toned Yardang-forming unit of Mt Sharp, Gale crater, Mars[J],2021,554.
APA	Dromart, G..,Le Deit, L..,Rapin, W..,Gasnault, O..,Le Mouelic, S..,...&Wiens, R. C..(2021).Deposition and erosion of a Light-Toned Yardang-forming unit of Mt Sharp, Gale crater, Mars.EARTH AND PLANETARY SCIENCE LETTERS,554.
MLA	Dromart, G.,et al."Deposition and erosion of a Light-Toned Yardang-forming unit of Mt Sharp, Gale crater, Mars".EARTH AND PLANETARY SCIENCE LETTERS 554(2021).