A refined chronology of catastrophic outflow events in Ares Vallis, Mars

A refined chronology of catastrophic outflow events in Ares Vallis, Mars
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火星阿瑞斯山谷灾难性外流事件的精确年表

DOI:
10.1016/j.epsl.2009.09.008
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发表时间:
2009
影响因子:
5.3
通讯作者:
Warner N
Warner N
中科院分区:
地球科学1区
文献类型:
--
作者:
Warner N

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我们调查的地貌和灾难性的洪水在一个主要的火星外流通道,战神谷年表。我们使用最近获得的立体和彩色图像和衍生的地形数据与网格间距为50米的高分辨率立体相机(HRSC)机载火星快车约束详细的洪水地貌近端战神谷。我们确定了6个不同的侵蚀面,可能形成的多个事件的灾难性洪水的形态证据。这些表面出现在不同的地形水平,表现出多套洪水槽,并包含不同的洪水后陨石坑人口。从MRO上下文相机(CTX)和热发射成像系统(THEMIS)可见光图像上的洪水侵蚀表面上的陨石坑计数统计表明,洪水是在晚诺亚纪/早期西方开始在103.6Ga。形态学数据证实,最古老的洪水事件发生在地形最高的侵蚀面,而随后的洪水放弃了上表面,并继续修改陨石坑的地形最低的,主要渠道的战神谷到晚期西方/早期亚马逊(2.5Ga)。我们的研究结果表明,水释放到战神谷可能发生在重复的时间间隔在很长一段地质时间,从而支持最近的数值模拟研究,建议补给水源。
We investigate the geomorphology and chronology of catastrophic flooding in a major martian outflow channel, Ares Vallis. We use recently acquired stereo and colour images and derived topographic data with grid-spacing of 50m from the High Resolution Stereo Camera (HRSC) onboard Mars Express to constrain the detailed flood geomorphology of proximal Ares Vallis. We identify morphologic evidence for 6 distinct erosion surfaces that were likely formed by multiple episodes of catastrophic flooding. These surfaces occur at distinct topographic levels, exhibit multiple sets of flood grooves, and contain distinct post-flood crater populations. Crater count statistics on the flood-eroded surfaces from MRO Context Camera (CTX) and Thermal Emission Imaging System (THEMIS) visible images indicate that flooding was initiated during the Late Noachian/Early Hesperian at ∼3.6Ga. The morphology data confirm that the oldest flooding events occurred on the topographically highest erosion surfaces while subsequent floods abandoned the upper surfaces and continued to modify craters in the topographically lowest, main channel of Ares Vallis into the Late Hesperian/Early Amazonian (∼2.5Ga). Our results suggest that release of water to Ares Vallis likely occurred at repeated intervals over a long period of geological time, thus supporting recent numerical modelling studies that suggest a recharging water source.
Harada M:“人类大脑图谱的最新进展”ELSEVIER。
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