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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Terraces and Gilbert-type deltas in crater lakes in Ismenius Lacus and Memnonia (Mars)
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Terraces and Gilbert-type deltas in crater lakes in Ismenius Lacus and Memnonia (Mars)

机译：Ismenius Lacus和Memnonia（火星）的火山口湖中的阶地和吉尔伯特型三角洲

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Paleolacustrine environments have been widely recognized from landform associations on the surface of Mars. In contrast to paleolakes in more open areas, putative crater lakes commonly display well-developed sedimentary landforms, especially wave-formed terraces and Gilbert-type deltas. This study focuses on terraces and deltas of Western Memnonia and Ismenius Lacus. As on Earth, these landforms provide important indications of water dynamics and sedimentary processes. The putative Martian paleolakes must have been active for thousands of years to have permitted the water movement and wave formation necessary to form one or more terraces. Fan-shaped landforms at the mouths of channels entering crater-lake areas may indicate various channel water interaction. Of these, Gilbert-type deltas are particularly informative. Their presence indicates multiple flooding events whereby the inlet channels conveyed coarse-grained sediment to the crater lake. Both terraces and deltaic progradation indicate that the crater lakes of Memnonia and Ismenius Lacus were active for long time periods, at least for thousands of years, during the post heavy bombardment period of the later Martian history. The unequivocal presence of standing bodies of water of relatively long durations indicates that climatic settings very different from those prevailing today must have occurred, at least locally and temporarily, during parts of the Martian planetary history. [References: 74]
机译：古湖泊环境已被火星表面的地貌协会广泛认可。与更开放地区的古湖相比，假定的火山口湖通常显示出发育良好的沉积地貌，特别是波浪形阶地和吉尔伯特型三角洲。这项研究的重点是西氨和伊斯梅纽斯·拉库斯的阶地和三角洲。如同在地球上一样，这些地貌为水动力学和沉积过程提供了重要指示。假定的火星古薄片必须活跃了数千年，才能允许形成一个或多个阶地的水流和波浪形成。进入火山口-湖区的河道口处的扇形地貌可能表明各种河道水相互作用。其中，吉尔伯特型三角洲特别有用。它们的存在表明发生了多次洪水事件，由此进口通道将粗粒沉积物输送到了火山口湖。阶地和三角洲的扩张都表明，在火星历史后期的重磅轰炸之后，Memnonia和Ismenius Lacus的火山口湖活跃了很长一段时间，至少数千年。持续时间较长的水体的明确存在表明，在火星行星历史的某些时期，至少在局部和暂时，已经发生了与今天普遍不同的气候环境。 [参考：74]

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