Other
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jvgr..155...81g&link_type=abstract
Journal of Volcanology and Geothermal Research, Volume 155, Issue 1-2, p. 81-89.
Other
15
Scientific paper
Tyrrhena Patera (22°S, 104°E), Mars, is a low-relief (1800 m maximum relief), central-vent volcano whose flanks are dissected with broad (˜5 km wide), flat-floored channels. The easily eroded nature of the shield materials, combined with extremely low flank slopes (≤ 2.0°), suggest that Tyrrhena Patera is composed of pyroclastic materials. These shield deposits are observed to crop out ≥ 600 km from the volcano's summit with measured thicknesses of 100 150 m at these distances. Such dimensions strongly suggest emplacement via pyroclastic flows. Currently available data indicate that these deposits have a mafic composition. Application of models derived for terrestrial pyroclastic flow emplacement reveals that, aside from environmental parameters (atmospheric density, gravity), if all else is held equal, a pyroclastic flow should travel a factor of 3 to 4 times farther on Mars than on Earth. The observed Tyrrhena Patera deposits extend even farther, suggesting that some emplacement mechanism may be enhancing pyroclastic flow runout distances on Mars.
Farley Melissa A.
Gregg Tracy K. P.
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