Highlights from 1:500K Geologic Mapping of Central and Southern Argyre Planitia

Details Highlights from 1:500K Geologic Mapping of Central and Southern Argyre Planitia Highlights from 1:500K Geologic Mapping of Central and Southern Argyre Planitia

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27.1003p&link_type=abstract

Lunar and Planetary Science, volume 27, page 1003

Mathematics

Logic

2

Argyre Planitia, Mars: Mapping, Sinuous Ridges

Scientific paper

The floors of the Argyre and Hellas basins contain etched layered material that is probably thick sedimentary deposits from channels that once flowed into them. Argyre is unique, however, because Uzboi Vallis flowed out of the basin, implying overflow of a lake within the basin. This makes it the largest impact basin on Mars with channels both draining into it and flowing out from it. Geologic mapping of the central and southern Argyre Basin has revealed a long and complex history of water and wind-related processes acting to shape the region over martian geologic time. The following paragraphs summarize my inferences about the geologic history of Argyre. The more important conclusions are: (I) There is no evidence to suggest that Argyre Planitia is younger than any other large impact basin on Mars; (II) the channels radial to the basin are subsequent streams that developed after the elevated rim (or multiple rings) of Argyre had been breached by valley networks draining both inward and outward from an ancient drainage divide at the basin's rim; (III) Uzboi Vallis is late Noachian in age, and probably drained a lake within Argyre northward through Ladon Valles, Margaritifer Valles, through a predecessor to Ares Valles, and into Chryse Planitia; (IV) The layered material in the basin interior is lacustrine and ranges in age from late Noachian through early Amazonian; (V) the sinuous ridges developed with the accumulating interior sediments and emanate from Surius Vallis, and are likely aqueous sedimentary structures, either lacustrine barriers or glacial eskers; (VI) the debris aprons in Charitum Montes are very young (late Amazonian), but not modern, as they are lightly cratered.

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