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DOI | 10.1002/2017GL073821 |
Extensive Amazonian-aged fluvial channels on Mars: Evaluating the role of Lyot crater in their formation | |
Weiss, David K.; Head, James W.; Palumbo, Ashley M.; Cassanelli, James P. | |
2017-06-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:11 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Widespread Amazonian-aged fluvial channels have been mapped proximal to Lyot crater, a similar to 225km diameter impact basin in the northern lowlands of Mars. Comparable in area to some Noachian/Hesperian fluvial systems, their morphology differs, being dominated by broad, shallow braided channels. Using new developments in the study of cratering, water inventory, and climate history, we assess eight different models for their origin. Dewatering of excavated ice-rich Lyot ejecta and contact melting from hot Lyot ejecta superposed on surface ice deposits are the most plausible channel origins. The existence of this extensive Amazonian fluvial system is attributed to: (1) the large size of Lyot, and its consequent hot ejecta, and (2) the presence of surface ice at the time of impact, attributed to obliquity changes redistributing polar ice to the mid-latitudes, a relatively common occurrence in Martian geologic history. Plain Language Summary A vast network of relatively young broad and shallow fluvial channels were previously mapped near Lyot crater, a similar to 225km diameter impact basin located in one of the lowest regions of Mars. These channels are highly unusual based on their young age and dispersed scour morphology. We use new developments in the study of cratering, water inventory, and climate history to assess different models for the origin of these channels. We find that the fluvial channels likely formed through runoff of water derived from dewatering of melted pore ice from within the ejecta and/or meltwater from contact melting of hot Lyot ejecta superposed on a regional surface ice sheet. The existence of this extensive young fluvial system is attributed to: (1) the large size of Lyot, and its consequent hot ejecta, and (2) the presence of surface ice at the time of impact, attributed to obliquity changes redistributing polar ice to the mid-latitudes, a relatively common occurrence in Martian geologic history. |
英文关键词 | Lyot crater Mars climate impact ejecta Mars fluvial channels Mars groundwater ejecta heating |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000404382600011 |
WOS关键词 | ICE DEPOSITS ; IMPACT EJECTA ; GLACIAL FLOW ; WATER ICE ; EVOLUTION ; OBLIQUITY ; DIFFUSION ; PLANITIA ; HISTORY ; COLD |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/25792 |
专题 | 气候变化 |
作者单位 | Brown Univ, Dept Earth Environm & Planetary Sci, Providence, RI 02912 USA |
推荐引用方式 GB/T 7714 | Weiss, David K.,Head, James W.,Palumbo, Ashley M.,et al. Extensive Amazonian-aged fluvial channels on Mars: Evaluating the role of Lyot crater in their formation[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(11). |
APA | Weiss, David K.,Head, James W.,Palumbo, Ashley M.,&Cassanelli, James P..(2017).Extensive Amazonian-aged fluvial channels on Mars: Evaluating the role of Lyot crater in their formation.GEOPHYSICAL RESEARCH LETTERS,44(11). |
MLA | Weiss, David K.,et al."Extensive Amazonian-aged fluvial channels on Mars: Evaluating the role of Lyot crater in their formation".GEOPHYSICAL RESEARCH LETTERS 44.11(2017). |
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