Thermal models for the magmatic accretion and subsequent metamorphism of continental crust

Details Thermal models for the magmatic accretion and subsequent metamorphism of continental crust Thermal models for the magmatic accretion and subsequent metamorphism of continental crust

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..46..253w&link_type=abstract

Earth and Planetary Science Letters, Volume 46, Issue 2, p. 253-265.

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27

Scientific paper

I present one-dimensional conductive relaxation models for the thermal evolution of continental crust which has undergone magmatic thickening in a predominantly recumbent tectonic regime. The sustained addition of magma, and associated heat, profoundly influences the conductive relaxation of the affected sialic crust. The mechanism of accretion, successively beneath (under-accretion), or successively above (over-accretion), previously added material, strongly affects the type of P-T-time history sustained by the rocks in the middle and deep crust. The pressure and temperature conditions which might be recorded by mineral assemblages equilibrating in such tectonothermal regimes may bear very little relation to conductive heat supplies from the upper mantle. P-T values obtained by geobarometry and geothermometry in such complexes must be used with caution to constrain steady state heat flows and geothermal gradients. In a contemporary plate tectonic context I consider the tectonothermal models developed here to apply particularly to island arcs and sites of continental collision associated with extensive plutonic igneous activity. Precambrian orthogneiss complexes, such as the Archaean of southern West Greenland, probably represent exhumed deep crustal elements involved in the intense magmatic thickening processes considered here.
Present address: Koninklijke/Shell Exploratie en Produktie Laboratorium, Volmerlaan 6, Rijswijk, The Netherlands.

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