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首页> 外文期刊>Planetary and space science >Evidence for an Hesperian-aged South Circum-Polar Lake Margin Environment on Mars
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Evidence for an Hesperian-aged South Circum-Polar Lake Margin Environment on Mars

机译：火星上一个西伯利亚时代的南周-北极湖边缘环境的证据

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A broad pitted plain and an elongated low rise occur near the south pole of Mars between a region of major cavi (Cavi Angusti) and a regionally smooth and broad valley (Argentea Planum). Viking, Mars Global Surveyor (MGS), and Odyssey data reveal a densely pitted plain covering ～6750 km~2, and containing > 300 irregularly shaped, steep-walled and flat-floored depressions with a mean diameter of ～3.5 km. At the southernmost (poleward) extent of this plain are 12 north/south trending linear valleys that are characterized by theater-shaped heads abutting a major cavi within Cavi Angusti. The pitted plain, which abuts Cavi Angusti to the southwest, is separated from the floor of Argentea Planum by a smooth, elongated low rise that extends parallel to the plain for ～200 km. These unusual features are all found within the Hesperian-aged circumpolar Dorsa Argentea Formation, which has been interpreted by some workers to be an ice-rich glacier-related deposit. We interpret the pitted plain to represent the maximum northern extent of the Angusti lobe ice deposit. The pits are analogous in morphology and distribution to terrestrial kettle holes, which form from the melting of isolated ice-blocks surrounded and partly buried by sediment, to leave hollows. The linear valleys are consistent with sapping valleys formed from the release of an elevated groundwater table, fed by meltwater lakes. On the basis of these characteristics, relationships and analogs, we interpret the marginal facies to represent an ice-sheet/lake contact environment that existed during Hesperian time.
机译：在火星南极附近，在主要鱼子区域（Cavi Angusti）和区域平滑而宽广的山谷（Argentea Planum）之间出现了一个宽阔的凹坑平原和一个细长的低层。维京人，火星全球测量师（MGS）和奥德赛的数据显示，密集的点状平原覆盖了约6750 km〜2，其中包含300多个不规则形状，陡壁和平坦地面的洼地，平均直径约为3.5 km。在该平原的最南端（极地），是12个向北/向南趋势的线性谷地，其特征是剧场状的头部紧靠Cavi Angusti内的一个主要鱼卵。与西南部的卡维·安古斯（Cavi Angusti）相邻的凹坑平原，与Argentea Planum的地面之间被平滑且细长的低层隔开，该低层平行于平原延伸了约200公里。这些不寻常的特征都在西伯利亚时代的圆极多萨Argentea组中发现，一些工人将其解释为与冰川相关的富含冰的矿床。我们解释点蚀的平原，以代表安格斯底角冰沉积物的最大北部范围。这些坑在形态和分布上与地面水壶孔类似，这些水壶孔是由孤立的冰块融化而成的，这些冰块被沉积物包围并部分掩埋，留下了中空。线性谷与由融化水湖提供的升高的地下水位释放所形成的流露谷一致。基于这些特征，关系和类似物，我们解释边缘相来代表在海斯佩瑞时期存在的冰盖/湖泊接触环境。

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