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首页> 外文期刊>Planetary and space science >Complex geomorphologic assemblage of terrains in association with the banded terrain in Hellas basin, Mars
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Complex geomorphologic assemblage of terrains in association with the banded terrain in Hellas basin, Mars

机译：复杂的地貌组合与火星海拉斯盆地的带状地形相关

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摘要

Hellas basin acts as a major sink for the southern highlands of Mars and is likely to have recorded several episodes of sedimentation and erosion. The north-western part of the basin displays a potentially unique Amazonian landscape domain in the deepest part of Hellas, called "banded terrain", which is a deposit characterized by an alternation of narrow band shapes and inter-bands displaying a sinuous and relatively smooth surface texture suggesting a viscous flow origin. Here we use high-resolution (HiRISE and CTX) images to assess the geomorphological interaction of the banded terrain with the surrounding geomorphologic domains in the NW interior of Hellas to gain a better understanding of the geological evolution of the region as a whole. Our analysis reveals that the banded terrain is associated with six geomorphologic domains: a central plateau named Alpheus Colles, plain deposits (P1 and P2), reticulate (RT1 and RT2) and honeycomb terrains. Based on the analysis of the geomorphology of these domains and their cross-cutting relationships, we show that no widespread deposition post-dates the formation of the banded terrain, which implies that this domain is the youngest and latest deposit of the interior of Hellas. Therefore, the level of geologic activity in the NW Hellas during the Amazonian appears to have been relatively low. and restricted to modification of the landscape through mechanical weathering, aeolian and periglacial processes. Thermophysical data and cross-cutting relationships support hypotheses of modification of the honeycomb terrain via vertical rise of diapirs such as ice diapirism, and the formation of the plain deposits through deposition and remobilization of an ice-rich mantle deposit. Finally, the observed gradual transition between honeycomb and banded terrain suggests that the banded terrain may have covered a larger area of the NW interior of Hellas in the past than previously thought. This has implications on the understanding of the evolution of the deepest part of Hellas. (C) 2015 Elsevier Ltd. All rights reserved.
机译：海拉斯盆地是火星南部高地的主要汇聚地，可能记录了几次沉积和侵蚀事件。盆地西北部在海拉斯的最深处显示出一个潜在的独特的亚马逊景观域，称为“带状地形”，这是一种沉积物，其特征是窄带形状和带间交替出现，呈曲折且相对光滑表面纹理表明粘性流起源。在这里，我们使用高分辨率（HiRISE和CTX）图像评估带状地形与海拉斯西北西北部周围地貌域之间的地貌相互作用，从而更好地了解整个地区的地质演化。我们的分析表明，带状地形与六个地貌域相关联：一个名为Alpheus Colles的中央高原，平原矿床（P1和P2），网状（RT1和RT2）和蜂窝地形。基于对这些区域的地貌学及其横切关系的分析，我们发现没有广泛的沉积作用是在带状地形形成之后进行的，这表明该区域是海拉斯内部最年轻和最新的沉积物。因此，亚马孙时期西北海拉地区的地质活动水平似乎相对较低。并且仅限于通过机械风化，风沙作用和冰川作用过程对景观进行改造。热物理数据和横切关系支持假说，即通过冰的透水现象垂直扩散上升蜂窝状地形，以及通过沉积和移动富含冰的地幔沉积物形成平原沉积物。最后，观察到的蜂窝状和带状地形之间的逐渐过渡表明，带状地形过去可能比以前认为的覆盖了海拉斯西北地区更大的区域。这对理解海拉斯最深处的演变有影响。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Planetary and space science》 |2016年第2期|36-52|共17页
  • 作者

    Diot X.; El-Maarry M. R.; Schlunegger F.; Norton K. P.; Thomas N.; Grindrod P. M.; Chojnacki M.;

  • 作者单位

    Univ Bern, Inst Geol, Baltzerstr 1-3, CH-3012 Bern, Switzerland|Univ Bern, Ctr Space & Habitabil, Sidlerstr 5, CH-3012 Bern, Switzerland;

    Univ Bern, Inst Phys, Sidlerstr 5, CH-3012 Bern, Switzerland;

    Univ Bern, Inst Geol, Baltzerstr 1-3, CH-3012 Bern, Switzerland;

    Victoria Univ Wellington, Sch Geog Environm & Earth Sci, Wellington, New Zealand;

    Univ Bern, Ctr Space & Habitabil, Sidlerstr 5, CH-3012 Bern, Switzerland|Univ Bern, Inst Phys, Sidlerstr 5, CH-3012 Bern, Switzerland;

    Univ London, Birkbeck, Dept Earth & Planetary Sci, London, England|UCL Birkbeck, Ctr Planetary Sci, London, England;

    Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Mars; Surface; Geomorphological processes; Hellas basin;

    机译：火星;表面;地貌过程;Hellas盆地;

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