期刊
GEOPHYSICAL RESEARCH LETTERS
卷 49, 期 14, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL097974
关键词
glacial geomorphology; glacial erosion; early Mars; subglacial hydrology; ice; valley networks
资金
- European Union [MGFR 101027900]
- School of Earth and Space Exploration (ASU) through the Exploration Fellowship
Comparing the theoretical behavior of ice sheets on Mars and Earth, we find that the lower gravity on Mars favors the formation of efficient subglacial drainage, explaining the apparent lack of large-scale glacial fingerprints on the Martian surface such as drumlins or lineations.
The lack of evidence for large-scale glacial landscapes on Mars has led to the belief that ancient glaciations had to be frozen to the ground. Here we propose that the fingerprints of Martian wet-based glaciation should be the remnants of the ice sheet drainage system instead of landforms generally associated with terrestrial ice sheets. We use the terrestrial glacial hydrology framework to interrogate how the Martian surface gravity affects glacial hydrology, ice sliding, and glacial erosion. Taking as reference the ancient southern circumpolar ice sheet that deposited the Dorsa Argentea formation, we compare the theoretical behavior of identical ice sheets on Mars and Earth and show that, whereas on Earth glacial drainage is predominantly inefficient, enhancing ice sliding and erosion, on Mars the lower gravity favors the formation of efficient subglacial drainage. The apparent lack of large-scale glacial fingerprints on Mars, such as drumlins or lineations, is to be expected.
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