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    题名: Grid Mapping the Northern Plains of Mars: A New Overview of Recent Water- and Ice-Related Landforms in Acidalia Planitia
    作者: 范噶色
    Gasselt, Stephan van
    Orgel, Csilla
    Wilson, Jack T.
    Balme, Matthew R.
    Conway, Susan J.
    Costard, Francois
    Eke, Vince R.
    贡献者: 地政系
    关键词: grid mapping;Acidalia Planitia;northern lowlands;latitude dependent mantle;periglacial;subsurface sediment mobilization
    日期: 2019-03
    上传时间: 2020-06-22 10:52:17 (UTC+8)
    摘要: We used a grid‐mapping technique to analyze the distribution of 13 water‐ and ice‐related landforms in Acidalia Planitia as part of a joint effort to study the three main basins in the northern lowlands of Mars, that is, Acidalia, Utopia, and Arcadia Planitiae. The landforms were mapped at full Context Camera resolution along a 300‐km‐wide strip from 20°N to 84°N. We identified four landform assemblages: (1) Geologically recent polar cap (massive ice), which superposes the latitude‐dependent mantle (LDM) (LA1); (2) ice‐related landforms, such as LDM, textured terrain, small‐scale polygons, scalloped terrain, large‐scale viscous flow features, and gullies, which have an overlapping distribution (LA2); (3) surface features possibly related to water and subsurface sediment mobilization (LA3; kilometer‐scale polygons, large pitted mounds, small pitted mounds, thumbprint terrain); and (4) irregularly shaped pits with raised rims on equator‐facing slopes. Pits are likely the result of an energetic release of volatiles (H2O, CO2, and CH4), rather than impact‐, volcanism‐, or wind‐related processes. LDM occurs ubiquitously from 44°N to 78°N in Acidalia Planitia. Various observations suggest an origin of air fall deposition of LDM, which contains less ice in the uppermost tens of meters in Acidalia Planitia than in Arcadia and Utopia Planitiae. However, LDM may be thicker and more extended in the past in Acidalia Planitia. The transition between LDM‐free terrain and LDM is situated further north than in Utopia and Arcadia Planitiae, suggesting different past and/or present climatic conditions among the main basins in the northern lowlands.
    關聯: Journal of Geophysical Research : Planets, Vol.124, No.2, pp.454-482
    数据类型: article
    DOI 連結: https://doi.org/10.1029/2018JE005664
    DOI: 10.1029/2018JE005664
    显示于类别:[地政學系] 期刊論文

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