Thermal response of the mantle following the formation of a “super-plate”

Details Thermal response of the mantle following the formation of a “super-plate” Thermal response of the mantle following the formation of a “super-plate”

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3722302h&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 22, CiteID L22302

Physics

3

Tectonophysics: Dynamics: Convection Currents, And Mantle Plumes, Tectonophysics: Dynamics Of Lithosphere And Mantle: General (1213), Tectonophysics: Earth'S Interior: Composition And State (1212, 7207, 7208, 8105), Tectonophysics: Evolution Of The Earth (0325), Tectonophysics: Heat Generation And Transport

Scientific paper

Evidence indicating that the mantle below Pangea was characterized by elevated temperatures supports the widely held view that a supercontinent insulates the underlying mantle. Implementing a 3D model of mantle convection featuring distinct oceanic and continental plates, we explore different effects of supercontinent formation on mantle evolution. We find that a halt in subduction along the margins of the site of the continental collision is sufficient to enable the formation of mantle plumes below a composite “super-plate” and that the addition of continental properties that contribute to insulation have little effect on sub-continental temperature. Our findings show that the mean temperature below a supercontinent surpasses that below the oceanic plates when the former is a perfect insulator but that continental thermal insulation plays only a minor role in the growth of sub-supercontinent mantle plumes. We suggest that the growth of a super-oceanic plate can equally encourage the appearance of underlying upwellings.

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