The tectonic evolution of western Ishtar Terra, Venus

Details The tectonic evolution of western Ishtar Terra, Venus The tectonic evolution of western Ishtar Terra, Venus

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.2209l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Dec. 1991, p. 2209-2212.

Physics

23

Mathematical Models, Planetary Geology, Planetary Mantles, Tectonics, Venus (Planet), Finite Element Method, Free Convection, Subduction (Geology), Viscous Flow

Scientific paper

The origin and evolution of Ishtar Terra is modeled using numerical simulations of crust/mantle interaction on Venus. Based on the present modeling, a two phase evolutionary sequence for Ishtar is favored. The first phase is driven by bulk mantle flow due to thermal convection and results in the formation of a thickened crustal block over a mantle downwelling. The second phase, a result of the thermal perturbation exerted on the mantle by the region of thickened crust, is driven by the sinking of a lithospheric slab. This slab-driven tectonic pulse leads to low angle subduction and orogenesis at the peripheries of the crustal block. Throughout its evolution Ishtar remains coupled to flow within the deep mantle, due to the lack of an asthenosphere, and ultimately bulk mantle flow comes to dominate as the effects of the slab-driven pulse wane.

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