Rapid megaflood-triggered base-level rise on Mars

Rapid megaflood-triggered base-level rise on Mars
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特大洪水引发火星基准面快速上升

DOI:
10.1130/g50277.1
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发表时间:
2022
期刊:
影响因子:
5.8
通讯作者:
Ahmed J
Ahmed J
中科院分区:
地球科学1区
文献类型:
--
作者:
Ahmed J

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火星上存在古老的河流系统已被广泛接受,但人们对它们形成的速度以及控制它们演化的环境条件知之甚少。我们分析了一系列保存完好的内银行酒吧存款的曲折弯曲的多叠蜿蜒河流脊在Aeolis Dorsa和比较地球上的类似功能,以建立其形成所需的条件。我们的研究结果表明,这些火星渠道是高度加积,上升一个数量级高于陆地河流。这种演变发生在非常快的时间尺度上,我们的估计表明,一些完整的内坝集存款,因此加积通道,可能已经形成在不到一个火星年,上限几十年。我们认为,这种独特的河道地形是由一系列外部来源的特大洪水(例如,火山口湖决口)。
The existence of ancient fluvial systems on Mars is widely accepted, but little is known about how quickly they formed, or what environmental conditions controlled their evolution. We analyzed a sequence of well-preserved inner-bank bar deposits within the meander bends of a multistacked sinuous fluvial ridge in Aeolis Dorsa and compared them to similar features on Earth to establish the conditions required for their formation. Our results reveal that these Martian channels were highly aggradational, rising an order of magnitude higher than terrestrial rivers. This evolution occurred over very rapid time scales, with our estimates suggesting that some entire inner-bar set deposits, and therefore the aggradational channel, may have formed in less than a single Martian year, with upper bounds of a few decades. We suggest that this unique channel topography was created by a rapidly rising downstream water body, triggered by a sequence of externally sourced megafloods (e.g., crater lake breaches).
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