Other
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufm.p12b1061c&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #P12B-1061
Other
5430 Interiors (8147), 5475 Tectonics (8149), 5480 Volcanism (8450), 6207 Comparative Planetology
Scientific paper
Earth appears unique among the terrestrial planets in possessing plate tectonics, an 'active-lid' mantle convection regime. Most other planets appear to be in a stagnant-lid regime, where the convective stresses due to mantle convection are unable to generate failure in the rigid surface boundary layer. Venus shows evidence for a catastrophic overturn event at ~750Ma, based on the cratering record. The tectonic regime of a planet, and the magnitude and distribution of heat production within it, are both factors in governing the internal temperatures, and subsequently melt production rates on the terrestrial planets. We use the Moresi and Solomatov (1998) failure criteria for brittle lithosphere, which is dependent on mantle temperatures, and boundary layer scalings for interior temperatures in internally heated systems to show a relationship between internal heat production and tectonic regime on the terrestrial planets. Crustal thickness variations also contribute to interior mantle temperatures in two ways: providing a heterogeneous surface boundary condition, and depleting the mantle of heat producing elements. We present two-phase convection simulations to show the conditions under which each of these two effects are dominant, and the effect they have on the melt production history of a planet.
Collier Mark
Lenardic Adrian
Moresi Louis
O'Neill Craig J.
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