Fluvial, Glacial and Volcanic Processes on Mars: Periods of Activity in the Geological Evolution of the Planet

Details Fluvial, Glacial and Volcanic Processes on Mars: Periods of Activity in the Geological Evolution of the Planet Fluvial, Glacial and Volcanic Processes on Mars: Periods of Activity in the Geological Evolution of the Planet

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p13d..02n&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #P13D-02

Mathematics

Logic

1160 Planetary And Lunar Geochronology, 5400 Planetary Sciences: Solid Surface Planets

Scientific paper

After three years in orbit about Mars, analyses of the data of the High Resolution Stereo Camera (HRSC) have led to a much more comprehensive understanding of the geological evolution of the planet and of the major events and processes through time. It has been confirmed that Mars has fallen dry on a global scale early-on, in the period 3.3-3.8 Ga ago. But there also is ample evidence that at certain times even until very recently, the surface of Mars experienced the occurrence of liquid water, probably stemming from hydrothermal activity. Also, glaciers seem to have been present, partly over extended periods of time, e.g., in Kasei Valles over more than 2 Ga until 1.3 Ga ago. The occurrence of water and ice in general appears to have been coupled to periods of volcanic activity in all areas investigated, such as Kasei Valles/Echus Chasma, Mangala Valles, parts of the Tharsis volcanic area, and the Medusae Fossae formation. We have found distinct activity periods for these processes, around 3.3-3.7 Ga ago, ~1.5 Ga ago, ~500 Ma ago, ~200 Ma ago, and ~100 Ma ago. There is remarkable coincidence in time for some of these activity periods with the ages found in martian meteorites for igneous activity and aqueous alteration.

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