期刊
ASTROBIOLOGY
卷 20, 期 8, 页码 994-1013出版社
MARY ANN LIEBERT, INC
DOI: 10.1089/ast.2019.2132
关键词
Mars; Perseverance rover; Landing site; HiRISE; HRSC; Fluvial landforms
资金
- CNES (Centre National d'Etudes Spatiales)
- Marie Curie Individual Postdoctoral Fellowship (WET_MARS) [795192]
- Marie Curie Actions (MSCA) [795192] Funding Source: Marie Curie Actions (MSCA)
Jezero crater has been selected as the landing site for the Mars 2020 Perseverance rover, because it contains a paleolake with two fan-deltas, inlet and outlet valleys. Using the data from the High Resolution Stereo Camera (HRSC) and the High Resolution Imaging Science Experiment (HiRISE), we conducted a quantitative geomorphological study of the inlet valleys of the Jezero paleolake. Results show that the strongest erosion is related to a network of deep valleys that cut into the highland bedrock well upstream of the Jezero crater and likely formed before the formation of the regional olivine-rich unit. In contrast, the lower sections of valleys display poor bedrock erosion and a lack of tributaries but are characterized by the presence of pristine landforms interpreted as fluvial bars from preserved channels, the discharge rates of which have been estimated at 10(3)-10(4) m(3)s(-1). The valleys' lower sections postdate the olivine-rich unit, are linked directly to the fan-deltas, and are thus formed in an energetic, late stage of activity. Although a Late Noachian age for the fan-deltas' formation is not excluded based on crosscutting relationships and crater counts, this indicates evidence of a Hesperian age with significant implications for exobiology.
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