Paleolake Inlet Valley Formation: Factors Controlling Which Craters Breached on Early Mars

被引：5
作者：
Bamber, Emily R. [1 ,2 ]
Goudge, T. A. [1 ,2 ,3 ]
Fassett, C., I [4 ,5 ]
Osinski, G. R. [6 ]
de Quay, G. Stucky [7 ]
机构：
[1] Univ Texas Austin, Dept Geol Sci, Jackson Sch Geosci, Austin, TX 78712 USA
[2] Univ Texas Austin, Ctr Planetary Syst Habitabil, Austin, TX 78712 USA
[3] CIFAR, CIFAR Azrieli Global Scholars Program, Toronto, ON, Canada
[4] NASA, Marshall Space Flight Ctr, Huntsville, AL USA
[5] Johns Hopkins Appl Phys Lab, Laurel, MD USA
[6] Univ Western Ontario, Dept Earth Sci, London, ON, Canada
[7] Harvard Univ, Dept Earth & Planetary Sci, 20 Oxford St, Cambridge, MA 02138 USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2022年 / 49卷 / 24期
关键词：
DRAINAGE DENSITY; BASIN LAKES; SURFACE; INCISION; CLIMATE; CLASSIFICATION; DEGRADATION; CONSTRAINTS; MODELS; EARTH;
D O I：
10.1029/2022GL101097
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
The ancient surface of Mars is dominated by degraded impact craters with reduced or eliminated rim relief. Some degraded craters have an inlet valley, while many remain fluvially isolated. Despite controlling Martian fluvial connectivity, few constraints exist on why some-but not all-degraded craters possess inlets. We compared a suite of properties around degraded Martian craters with and without inlets to ascertain what topographic and hydrologic factors influenced inlet formation. Slope and surface roughness are similar, but topographic inset within the catchment, drainage density, and potential contributing areas diverge for breached and non-breached craters. We suggest that the importance of basin hydrology-related factors over topographic factors is the result of the former less frequently surpassing inlet incision thresholds than the latter. We conclude that greater topographic inset (i.e., craters deeper within regional depressions) promoted higher discharge, and that inlet valley formation was ultimately controlled by Mars' crater-dominated topography.
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页数：11
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