A petrologic geotherm from a continental rift in Antarctica

Details A petrologic geotherm from a continental rift in Antarctica A petrologic geotherm from a continental rift in Antarctica

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989e%26psl..93...98b&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 93, no. 1, May 1989, p. 98-108.

Mathematics

Logic

21

Antarctic Regions, Earth Crust, Geological Faults, Geotemperature, Petrology, Advection, Heat Transfer, Inclusions, Petrography, Pressure Gradients

Scientific paper

A petrologically-determined crustal geotherm from a continental-rift environment in the Ross Sea and adjacent Tranantarctic Mountains has been documented on the basis of the thermobarometry of garnet, spinel, and olivine granulites included in Cenozoic alkaline volcanic rocks. Thermometry yields temperatures of the order of 900-1000 C in the middle and lower crust; these high temperatures, in conjunction with the geotherm's shape, clearly indicate that advection, rather than conduction, was the dominant heat-transfer mechanism in the lower and middle crust of this rift environment. The injection of alkaline basaltic magmas is the likely cause of the advective heat transfer.

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