Now showing items 1-10 of 454
Calcretes of the Bauru Group ( Cretaceous), Brazil; petrology and geological significance.
Reinterprets petrologic studies and their geologic significance in the light of recent literature on the calcretes in the world, and the recent revision of Bauru Group stratigraphy.-from English summary
Geochemical characteristics of central Chile (33 °-34 °S) granitoids
Seventeen granitoid samples from batholiths in central Chile (33 °-34 ° S) have been analyzed for trace element content. The samples range in age from Paleozoic to Tertiary, and in rock type from quartz diorite to granite. ...
Amphibole-bearing Basalts from the submarine volcano Kick'em-Jenny in the Lesser Antilles island arc
This paper describes the occurrence of amphibole megacrysts in olivine basalt pyroclast deposits. It also discusses the geology and petrology of the active Kick'em-Jenny submarine volcano in the Southern Grenadines of the ...
The Cobres Plutonic Complex, eastern Puna (NW Argentina): Petrological and structural constraints for Lower Paleozoic magmatism
(Pergamon-Elsevier Science Ltd, 2006-12)
The southern portion of the Cobres Range is studied with an interdisciplinary, petrological–geochemical and structural-cartographic approach. The Cobres Plutonic Complex (CPC) consists of two main plutons, a granodiorite ...
Andesites and high-alumina basalts from the central-south Chile high Andes: Geochemical evidence bearing on their petrogenesis
High-alumina basalts from seven High-Andean stratovolcanoes (37 °30′S to 41 °S) have major and trace element (including rare earth elements, REE) that are consistent with derivation by partial melting (typically 10-15%) ...