Title	Thermal, radioactive and magnetic properties of the lavas of the Mt. Melbourne volcanic field (Victoria Land, Antarctica)
Author	Pasquale, V.; Verdoya, M.; Chiozzi, P.; Armadillo, E.
Author Affil	Pasquale, V., Universita di Genova, Dipartimento per lo Studio del Territorio e delle sue Risorse, Italy
Source	Annals of Geophysics, 52(2), p.197- 207, . Publisher: Editrice Compositori, Bologna, Italy. ISSN: 1593- 5213
Publication Date	Apr. 2009
Notes	In English. 16 refs. GeoRef Acc. No: 297251
Index Terms	Antarctica--Mount Melbourne; Southern Ocean--Ross Sea; Antarctica; chemical composition; enthalpy; geochemistry; geophysical methods; geophysical surveys; heat flow; igneous rocks; isotopes; lava; mafic composition; magnetic methods; magnetic properties; mineral composition; Mount Melbourne; Mount Melbourne volcanic field; petrography; radioactive isotopes; radioactivity; radioactivity methods; rift zones; Ross Sea; Southern Ocean; surveys; thermal conductivity; thermal properties; Victoria Land; volcanic fields; volcanic rocks
Abstract	We present the results of measurements of physical properties carried out on mafic lavas from the Mt Melbourne Volcanic Field, useful for interpretation of geophysical surveys designed to shed light on the structure of the crust. The thermal conductivity is comparable to that of glass and shows a clear negative dependence on porosity. The volume heat capacity and the thermal diffusivity are less variable. The concentration of the thermally important natural radioactive isotopes was determined by gamma-ray spectrometry. Lavas denoted a rather low heat-production rate, and the largest concentration of heat-producing elements (potassium, uranium, thorium) was found in the trachyte samples. The magnetic susceptibility is more variable than the other physical properties and, among the several iron-titanium oxides, it appears primarily controlled by the ulvospinel- magnetite solid solution series.
Publication Type	journal article
Record ID	87485