Mathematics – Logic
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.0207o&link_type=abstract
American Astronomical Society, DPS meeting #28, #02.07; Bulletin of the American Astronomical Society, Vol. 28, p.1059
Mathematics
Logic
Scientific paper
The Martian hydrological system from a sedimentological point of view can be regarded as composed by three variable: the production of water, the transport of water and sediment, the storing of water and sedimentation of detritus.. The evidence of the presence of water on Mars suggest that it has been ubiquitous on the Planet. Lacustrine basins, oceans, channel of various patterns and origins require a rather efficient hydrological system that, in turn, require large reservoirs. If these reservoirs consist of permafrost, a mechanism of liquefaction and fluidization is required in order to mobilize the water in its liquid form. There are several sedimentological features that suggest that this kind of processes occurred at the border of the main Martian basins (like the Chryse Basin) and, of course in the Chaos. Apart the formation of the mesas linked to the collapse of lower layers, mud volcanoes and some types of wrinkle ridges are probably due to the water expulsion, that on Mars is facilitated by the low gravity value. The transport of water occurred several times during the geological history of Mars by means of large catastrophic floods. However, in spite of the episodic of nature of the floods they formed complex systems with lakes and delta. Several embayments of the outflow channels show terraces formed by bodies of standing waters. Terraces occurs also in the channels and lacustrine basin shorelines are affected by several levels of terraces. The history of the channels is not simple as well. The present day outflow channels are actually the results of the addition of several reaches active at different stages. Although catastrophic the floods repeated several times forming well defined depositional environments.
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