Physics – Geophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..125j&link_type=abstract
In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 125-126 (SEE N92-10728 01-91)
Physics
Geophysics
Chronology, Glaciers, Landforms, Mars Craters, Mars Surface, Planetary Geology, Structural Basins, Volcanoes, Calderas, Cratering, Erosion, Planetary Evolution, Stratigraphy, Terrain, Topography, Troughs
Scientific paper
The Hellas Impact Basin is one of the oldest features on Mars, as indicated by the high density of large impact craters in parts of the basin. The highly degraded condition of Hellas seems consistent with great antiquity. However, many of the most strikingly modified landscapes in the basin, believed to be glaciogenic, also appear to be geologically youthful. Stratigraphic relations suggest two episodes of glaciation. Chronologic constraints are imposed on glaciation based on the impact cratering record, the focus of which is the southwestern portion of Hellas. Major terrain units are mapped. The lineated terrain and ridged plains form the summit and flanks of a large shield volcano, Amphitrites Patera, which was superimposed over the southwestern rim of Hellas toward the end of heavy bombardment. The ridged plains and lineated terrain are crossed by numerous wrinkle ridges. The lineated terrain is distinguished by a pervasive system of deep erosional troughs and sharp ridges thought to have been glacially sculpted by the Hellas Lobe. It is concluded that glaciation in Hellas occurred during the Middle Amazonian, roughly coeval with glaciation in Argyre.
Johnson Nan
Kargel Jeffrey S.
Knight Christine
Strom Roger G.
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