Nd-Sr-Pb isotopic variations along the Gulf of Aden - Evidence for Afar mantle plume-continental lithosphere interaction

Details Nd-Sr-Pb isotopic variations along the Gulf of Aden - Evidence for Afar mantle plume-continental lithosphere interaction Nd-Sr-Pb isotopic variations along the Gulf of Aden - Evidence for Afar mantle plume-continental lithosphere interaction

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9710927s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. B7, July 10, 1992, p. 10,927-10,966. Research supported by NSF.

Mathematics

Logic

64

Earth Mantle, Lead Isotopes, Lithosphere, Neodymium Isotopes, Strontium Isotopes, Geochemistry, Planetary Composition, Red Sea

Scientific paper

The rare-earth-element concentrations and Nd, Sr, and Pb isotopic compositions of the basalts in the Gulf of Aden are described and related to asthenospheric and lithospheric interactions with a thermal toruslike plume. Specific attention is given to the spatial and temporal traits of the mantle sources, and isotopic and geochemical data are used to determine the extent to which basaltic volcanism is derived from a mantle plume, the mantle lithosphere, and upwelling of the depleted atmosphere. The impingement and dispersion of a plume head is confirmed beneath the Afar region, and the geological record shows continental stretching and rifting prior to the impingement in the outskirts of the Horn of Africa. The data suggest that the isotopic variations along the Gulf of Aden/Red Sea/Ethiopia Rift system can be explained by the interaction of a thermal toruslike plume with the depleted asthenosphere and the overlying continental mantle lithosphere.

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