Mathematics – Logic
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1167d&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1167
Mathematics
Logic
Scientific paper
On the base of remote sensing and terrestrial geological data we have elaborated a hypothesis about the origin of calderas on Venus through a global and a local scale comparison with similar structures on Earth. For the global scale comparison, we categorized the Venusian and the terrestrial volcanic depressions. We extracted for comparison geometric data such as areal dimensions and eccentricity. For the local scale comparison we have selected two cases of study which are comparable in terms of size: Mezrina Patera, on Venus, and Vulsini Complex (Lazio, Italy) on Earth. A geological mapping of the main structural features and deposits has been conducted and a number of specific features, which are interpreted to be related to extrusion of lava and intrusion of magma have been identified in Mezrina Patera. These are: volcano-tectonic depressions, resurgences, lobate deposits, channelized flows (plausible lava flows) and concentric lava domes. The genetic processes behind the formation of the Venusian patera seem to have been influenced from both global and local scale stress fields. Vulsini Complex doesn't show the same evidence, so that the terrestrial volcanic complex appears to have been predominantly influenced by local scale stress fields. While Vulsini Complex is clearly related to explosive volcanism, Mezrina Patera could be connected with a hot spot or mantle plume activity. A deeper analysis of the most recent 1 micron thermal emissivity and surface temperature data, which will be reported in a further pubblication, will allow us to better constrain if Mezrina Patera might be related to recent volcanism.
D'Amore Mario
D'Incecco P.
Helbert Jérôme
Maturilli Alessandro
Törmänen T.
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