Magmatism at rift zones - The generation of volcanic continental margins and flood basalts

Details Magmatism at rift zones - The generation of volcanic continental margins and flood basalts Magmatism at rift zones - The generation of volcanic continental margins and flood basalts

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.7685w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, June 10, 1989, p. 7685-7729. Research supported by the Green Foundati

Mathematics

Logic

811

Basalt, Continental Shelves, Geological Faults, Igneous Rocks, Magma, Earth Crust, Earth Mantle, Volcanoes

Scientific paper

A simple model is developed which explains the occurrence of volcanic continental margins and flood basalts as a consequence of their association with nearby plumes that were active at the time of rifting. In the model, asthenosphere temperatures are increased by 100-150 C over large regions of the earth by heat advected upward in mantle plumes. The amount of partial melt generated by the asthenosphere as it wells up beneath rifts in these hot areas is calculated. Observational constraints from all known examples of volcanic continental margins are reviewed and the model is used to explain these observations.

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