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Density and Lithospheric Structure at Tyrrhena Patera from Gravity and Topography Data

Grott, Matthias and Wieczorek, Mark (2012) Density and Lithospheric Structure at Tyrrhena Patera from Gravity and Topography Data. Icarus: International Journal of Solar System Studies, 221 (1), pp. 43-52. Elsevier. doi: 10.1016/j.icarus.2012.07.008.

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Official URL: http://www.sciencedirect.com/science/article/pii/S0019103512002825


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 2960 kg m−3, minimum load thicknesses of 5 km, 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 3343 kg m−3, a load thickness of 10.8 km, 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 27.5 km at the time of loading, indicating surface heat flows in excess of 24 mW m−2.

Item URL in elib:https://elib.dlr.de/80115/
Document Type:Article
Title:Density and Lithospheric Structure at Tyrrhena Patera from Gravity and Topography Data
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Grott, MatthiasUNSPECIFIEDhttps://orcid.org/0000-0002-8613-7096UNSPECIFIED
Wieczorek, MarkInstitut de Physique du Globe de Paris, Université Paris Diderot, Case 7011, Bâtiment Lamarck A, 5 rue Thomas Mann, 75205 Paris Cedex 13, FranceUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Icarus: International Journal of Solar System Studies
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 43-52
EditorsEmailEditor's ORCID iDORCID Put Code
Nicholson, P.D. Cornell University, Department of AstronomyUNSPECIFIEDUNSPECIFIED
Keywords:Mars, Geophysics, Volcanism, Interiors
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Exploration of the Solar System
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Institute of Planetary Research
Deposited By: Rückriemen, Tina
Deposited On:07 Jan 2013 11:46
Last Modified:08 Nov 2023 07:54

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