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Filtering by: Creator White, William M. Has journal sim Journal of Geophysical Research

Petrology and Geochemistry of the Galápagos Islands : portrait of a pathological mantle plume

Creator:

White, William M., McBirney, Alexander R., and Duncan, Robert A.

Abstract:

We report new major element, trace element, isotope ratio, and geochronological data on the Galapagos Archipelago. Magmas erupted from the large western volcanos are generally moderately fractionated tholeiites of uniform composition; those erupted on other islands are compositionally diverse, ranging from tholeiites to picritic basanitoids. While these volcanoes do not...

Resource Type:

Article
Tahiti: Geochemical evolution of a French Polynesian volcano

Creator:

Duncan, Robert A., Fisk, Martin R., White, William M., and Nielsen, Roger L.

Abstract:

The island of Tahiti, the largest in French Polynesia, comprises two major volcanoes aligned NW-SE, parallel with the general trend of the Society Islands hotspot track. Rocks form this volcanic system are basalts transitional to tholeiites, alkali basalts, basanites, picrites, and evolved lavas. Through K-Ar radiometric dating we have established...

Resource Type:

Article