Glacial deposits on the rim of a Hesperian-Amazonian outflow channel source trough: Mangala Valles, Mars

Details Glacial deposits on the rim of a Hesperian-Amazonian outflow channel source trough: Mangala Valles, Mars Glacial deposits on the rim of a Hesperian-Amazonian outflow channel source trough: Mangala Valles, Mars

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3110701h&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 10, CiteID L10701

Astronomy and Astrophysics

Astrophysics

16

Planetology: Solid Surface Planets, Planetology: Solid Surface Planets: Atmospheres-Evolution, Planetology: Solid Surface Planets: Glaciation, Planetology: Solar System Objects: Mars

Scientific paper

Mangala Valles, located in tropical regions of Mars, is interpreted to have formed by dike-induced cracking of the cryosphere to produce a linear graben and catastrophic release of groundwater sequestered under hydrostatic pressure. Outpouring of water and downcutting led to erosion and widening of the graben to produce a trough. Patterns of ridges and lobes along the outer rims of the trough are interpreted to have formed primarily by local accumulations of snow and ice on the graben rim (derived from exposed ponded groundwater in the graben), and glacial-like outward flow of ice lobes resulting in development of moraines and tills along the north and south rims of the trough. These observations and interpretations support the concept that the climate of Mars was a hyper-arid cold polar-like desert similar to today in the Late Hesperian-Early Amazonian period.

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