The stratigraphic sequence of volcanic and sedimentary units in the north polar region of Mars

Details The stratigraphic sequence of volcanic and sedimentary units in the north polar region of Mars The stratigraphic sequence of volcanic and sedimentary units in the north polar region of Mars

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apg..book..267b&link_type=abstract

In NASA, Washington Advan. in Planetary Geol. p 267-326 (SEE N80-27268 17-99)

Mathematics

Logic

Geomorphology, Ice Environments, Mars (Planet), Stratigraphy, Viking Mars Program, Mars Surface, Photogeology, Photointerpretation, Structural Properties (Geology), Volcanology

Scientific paper

Based on photogeologic mapping of Viking Orbiter images of Mars, four distinct informal stratigraphic units can be defined for the region north of 70 N latitude. They are: (1) bulbous plains, (2) mantled plains, (3) dune deposits, and (4) layered deposits/perennial ice. The bulbous plains unit underlies all other north polar units and represents a sub-unit of the mottled cratered plains. The low albedo of bulbous plains and the appearance of what appears to be a dike suggest that bulbous plains has a volcanic origin. Cumulative crater size frequency distribution functions for bulbous and mantled plains support the interpretation that mantled plains were formed by dust blanketing of bulbous plains. Dune deposits occur in the form of longitudinal, transverse, and barchan dunes, and possibly as sheet sand deposits. A gradation from densely spaced transverse dunes to more dispersed barchan and transverse dunes implies a general thinning of circumpolar dune deposits downwind of extensive areas mapped as bulbous plains. It is concluded that dune material is being stripped from bulbous plains and is accumulating as dunes downwind on mantled plains.

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