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    题名: Grid Mapping the Northern Plains of Mars: Geomorphological, Radar, and Water-Equivalent Hydrogen Results From Arcadia Plantia
    作者: 范噶色
    Gasselt, Stephan van
    Ramsdale, Jason D.
    Eke, Vince R.
    Johnsson, Andreas
    Kereszturi, Akos
    Losiak, Anna
    Massey, Richard J.
    Platz, Thomas
    Reiss, Dennis
    Skinner, James A.
    ;Swirad, Zuzanna M.
    Balme, Matthew R.
    Teodoro, Luis F. A.
    Wilson, Jack T.
    Gallagher, Colman
    Susan
    贡献者: 地政系
    日期: 2019-02
    上传时间: 2020-04-27 15:57:23 (UTC+8)
    摘要: A project of mapping ice-related landforms was undertaken to understand the role of subsurface ice in the northern plains. This work is the first continuous regional mapping from CTX (ConTeXt Camera, 6 m/pixel; Malin et al.,) imagery in Arcadia Planitia along a strip 300 km across stretching from 30°N to 80°N centered on the 170°W line of longitude. The distribution and morphotypes of these landforms were used to understand the permafrost cryolithology. The mantled and textured signatures occur almost ubiquitously between 35°N and 78°N and have a positive spatial correlation with inferred ice stability based on thermal modeling, neutron spectroscopy, and radar data. The degradational features into the LDM (latitude-dependent mantle) include pits, scallops, and 100-m polygons and provide supporting evidence for subsurface ice and volatile loss between 35 and 70°N in Arcadia with the mantle between 70 and 78°N appearing much more intact. Pitted terrain appears to be much more pervasive in Arcadia than in Acidalia and Utopia suggesting that the Arcadia study area had more widespread near-surface subsurface ice and thus was more susceptible to pitting or that the ice was less well buried by sediments. Correlations with ice stability models suggest that lack of pits north of 65–70°N could indicate a relatively young age (~1 Ma); however, this could also be explained through regional variations in degradation rates. The deposition of the LDM is consistent with an air fall hypothesis; however, there appears to be substantial evidence for fluvial processes in southern Arcadia with older, underlying processes being equally dominant with the LDM and degradation thereof in shaping the landscape.
    關聯: Journal of Geophysical Research, Vol.124, No.2, pp.504-527
    数据类型: article
    DOI 連結: https://doi.org/10.1029/2018JE005663
    DOI: 10.1029/2018JE005663
    显示于类别:[地政學系] 期刊論文

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