Part 1: The geomorphic evolution of Eastern Margaritifer Sinus, Mars

Details Part 1: The geomorphic evolution of Eastern Margaritifer Sinus, Mars Part 1: The geomorphic evolution of Eastern Margaritifer Sinus, Mars

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apg..nasa.....g&link_type=abstract

In its Advances in Planetary Geology 259 p (SEE N87-25255 18-91)

Mathematics

Logic

Craters, Drainage, Geomorphology, Mapping, Mars (Planet), Planetary Geology, Structural Properties (Geology), Climatology, Evolution (Development), Photointerpretation, Plates (Tectonics), Terrain

Scientific paper

Geomorphic mapping, crater counts on selected surfaces, and a detailed study of drainage basins, were used to trace the geologic evolution of Margaritifer Sinus Quandrangle. The oldest dated surface covering these basins evolved during the period of intense bombardment. Since that time four resurfacing events have occurred. The first three were all of regional extent, while the fourth, occurred locally, filling basins. Valley networks, incised in the third event unit, are always buried by the fourth event unit when present. A peak in geomorphic activity occurred from 10,000 to 5000. Events during this period included the formation of Uzboi/Ladon Valles with deposition in Ladon Basin, and the formation of Samara and Parana/Loire Valles in MC19SE. Flow out of Ladon Basin and to a lesser extent Samara and Parana/Loire Valles created etched terrain at their confluence that was synchronous with initiation of Margaritifer and Iani Chaos. The range of dates for the chaos may be due to periodic collapse. The extensive, well integrted nature of Samara and Parana/Loire Valles requires the existence of a long period of favorable climatic conditions to allow their formation. Development of these two systems was probably through sapping processes.

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