Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.v21d..01l&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #V21D-01
Other
8120 Dynamics Of Lithosphere And Mantle: General (1213), 8121 Dynamics: Convection Currents, And Mantle Plumes, 8159 Rheology: Crust And Lithosphere (8031), 8164 Stresses: Crust And Lithosphere
Scientific paper
Compilations of continental crustal age distribution show large peaks at 1.1, 1.9-2.1, 2.7 and 3.5Ga. These peaks have been interpreted as evidence of episodicity in the Earth's mantle-lithosphere system. Paleomagnetic evidence suggests periods of rapid plate motions coinciding with the peaks in crustal age distribution. We review a recent model for episodic tectonics in the Precambrian, where higher mantle temperatures result in lower lithospheric stresses, causing rapid pulses of subduction interspersed with periods of relative quiescence. Plate-driven episodicity arises for hotter mantle temperatures of the early Earth and can explain rapid pulses of plate motion and crustal production. Increased internal temperatures within the mantle of a terrestrial planet can also be driven from above by a runaway greenhouse atmosphere and this serves as another trigger for episodic mantle convection. We review a scaling theory and numerical simulations that explore this mechanism and discuss the implications for Earth-Venus differences.
Jellinek A.
Lenardic Adrian
Moresi Louis
O'Neill Craig
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