Mathematics – Logic
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aplg.nasa..165a&link_type=abstract
In NASA, Washington Advan. in Planetary Geol. p 165-264 (SEE N80-27268 17-99)
Mathematics
Logic
Earth (Planet), Geomorphology, Ice Environments, Mars (Planet), Viking Mars Program, Volcanology, Mars Surface, Photogeology, Photointerpretation, Structural Properties (Geology)
Scientific paper
Analogs to terrestrial table mountains, ridges and pseudocraters have been identified on Viking imagery of Mars, notably in Acidalia Planitia. Photointerpretation of this region has led to the formulation of a consistent geologic history. An ice rich regolith once overlay the present plains surface, and may still exist in the adjacent highlands. Volcanic eruptions beneath this layer produced the Martian analogs to table mountains and ridges. Estimates of the heights of these features indicate that the regolith averaged approximately 500 m thick. At some time, changes in in climate or subsurface heat flow led to melting of the ice and breakdown of the regolith. Subsequently the exposed lowlands were extensively resurfaced by thin lava flows. A similar history is postulated for all of the northern plains of Mars, based on the occurrence of geologic features resembling those in Acidalia Planitia. The ice rich regolith required by this model could have contained 8 times 10 to the 21st power cu cm of water. This is several times the total volume thought to have been outgassed by the planet, based on atmospheric measurements. A serious discrepancy thus exists between interpretations of geologic and atmospheric data concerning the history of water on Mars.
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