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Density and lithospheric structure at Tyrrhena Patera, Mars, from gravity and topography data



Density and lithospheric structure at Tyrrhena Patera, Mars, from gravity and topography data



Icarus 221(1)



The Tyrrhena Patera highland volcano, Mars, is associated with a relatively well localized gravity anomaly and we have carried out a localized admittance analysis in the region to constrain the density of the volcanic load, the load thickness, and the elastic thickness at the time of load emplacement. The employed admittance model considers loading of an initially spherical surface, and surface as well as subsurface loading is taken into account. Our results indicate that the gravity and topography data available at Tyrrhena Patera is consistent with the absence of subsurface loading, but the presence of a small subsurface load cannot be ruled out. We obtain minimum load densities of 2960kgm?3, minimum load thicknesses of 5km, and minimum load volumes of 0.6 106 km3. Photogeological evidence suggests that pyroclastic deposits make up at most 30% of this volume, such that the bulk of Tyrrhena Patera is likely composed of competent basalt. Best fitting model parameters are a load density of 3343kgm?3, a load thickness of 10.8km, and a load volume of 1.7 106 km3. These relatively large load densities indicate that lava compositions are comparable to those at other martian volcanoes, and densities are comparable to those of the martian meteorites. The elastic thickness in the region is constrained to be smaller than 27.5km at the time of loading, indicating surface heat flows in excess of 24mWm?2. A localized admittance study at the Tyrrhena Patera highland volcano is carried out. Load density, load thickness, and elastic thickness are constrained. A minimum load density of 2960kgm?3 and load thickness of 5km are obtained. The maximum admissible elastic thickness is 27.5km. Tyrrhena Patera is likely composed of competent basalt.

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Accession: 036533594

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DOI: 10.1016/j.icarus.2012.07.008


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