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Continental Magmatism and Asymmetry in the South Atlantic
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 3rd International Congress of the Brazilian Geophysical Society, Nov 1993, cp-324-00259
Abstract
Melt production rates are estimated for the ocean tracks (Rio Grande Rise, Walvis-Ridge) and the onshore Parana/Etendeka Flood Basalts for the mantle plume currently associated with Tristan da Cunha. There is a marked asymmetry in the melt production rates in both .oceanic and continental areas, and those in the Parana may have been 5-10 times greater than those on the Rio Grande Rise. Melt production rates reflect the presence of volatiles in the sub-continental mantle, and differences in the tectonic regimes on either side of the South Atlantic.