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Mostrando ítems 91-100 de 3797
On the crystallization conditions of the Neoproterozoic, high-K calc-alkaline, Bragança Paulista-type magmatism, southern Brasília Orogen, SE Brazil
(Sociedade Brasileira de Geologia, 2019)
Topaz magmatic crystallization in rhyolites of the Central Andes (Chivinar volcanic complex, NW Argentina): Constraints from texture, mineralogy and rock chemistry
(Elsevier Science, 2013-10)
Topaz-bearing rhyolite lavas were erupted as domes and cryptodomes during the early history of the Late Miocene Chivinar volcano, in Central Andes. These are the only topaz rhyolite lavas recognized in Central Andes. ...
First geochemical and geochronological characterization of Late Cretaceous mesosilicic magmatism in Gastre, Northern Patagonia, and its tectonic relation to other coeval volcanic rocks in the region
(Cambridge University Press, 2019-07)
This work characterizes Late Cretaceous calc-alkaline volcanic rocks in Gastre, Northern Patagonia, Argentina. These newly found porphyritic rocks bear an 40Ar–39Ar amphibole age of ∼ 74–76 Ma, a subduction-type geochemical ...
GEOLOGY AND GEOCHEMISTRY OF THE SHOSHONITIC TERRA NOVA PLUTON, PE: EVIDENCE OF MEDIUM PRESSURE PROTEROZOIC MAGMATISM IN THE BORBOREMA PROVINCEGEOLOGIA E GEOQUÍMICA DO PLUTÃO SHOSHONÍTICO DE TERRA NOVA: EVIDÊNCIAS DE MAGMATISMO PROTEROZÓICO DE PRESSÃO. MÉDIA NA PROVÍNCIA BORBOREMA
(Sociedade Brasileira de Geologia, 2017)