Buscar
Mostrando ítems 1-10 de 98
Petrology and geochemistry of the orbicular granitoid of Sierra de Velasco (NW Argentina) and implications for the origin of orbicular rocks
(Cambridge University Press, 2010-02)
The Velasco orbicular granitoid is a small (65 × 15 m), irregularly-shaped body that cropsout within the Huaco granite, central Sierra de Velasco, NW Argentina. It consists of ellipsoid-shapedorbicules of 3 to 15 cm length ...
Comparing the reactivity of glasses with their crystalline equivalents: the case study of plagioclase feldspar
(Pergamon-Elsevier Science Ltd, 2019-04)
To evaluate the impact of atomic short- and long-range orders on silicate dissolution kinetics, the dissolution of amorphous and crystalline oligoclase was investigated at pH 1.5 and 10 at 90 °C. Experiments in solution ...
Magmatismo básico jurásico-cretácico en los andes fueguinos y su relación con la cuenca marginal rocas verdesJurassic-Cretaceous basic magmatism in the Fuegian Andes and their relationship with the Rocas Verdes marginal basin
(Asociación Geológica Argentina, 2016-03)
Numerosos filones capa, diques y coladas básicas bordean las ofiolitas de la cuenca marginal Rocas Verdes, afectados por metamorfismo regional de bajo grado. Se distinguen tres variedades según su paragénesis primaria: ...
Thermal divide andesites - trachytes, petrologic evidence, and implications from Jurassic north Patagonian massif alkaline volcanism
(Pergamon-Elsevier Science Ltd, 2003-12)
The Andesitas Alvar Formation is part of the large Jurassic volcanic province of Patagonia (southern South America) that, in Jurassic time, participated in the disassembling of Gondwana in a tensional-transtensional regime ...
Petrografía y geoquímica de lavas básicas del sector noroeste de la Meseta de Somuncurá, provincia de Río NegroPetrography and geochemistry of basic lavas from the northwestern part of Meseta de Somuncurá, Río Negro province
(Asociación Geológica Argentina, 2017-12)
En el sector noroccidental de la Meseta de Somuncurá, afloran rocas volcánicas básicas con características petrográficas y geoquími- cas que permiten diferenciarlas en dos grupos: A) Rocas lávicas con microfenocristales ...
Petrogenesis of Quebrada de la Mina and Altar North porphyries (Cordillera of San Juan, Argentina): Crustal assimilation and metallogenic implications
(Elsevier Science, 2017-09)
We investigate the geology of Altar North (Cu–Au) and Quebrada de la Mina (Au) porphyry deposits located in San Juan Province (Argentina), close to the large Altar porphyry copper deposit (995 Mt, 0.35% Cu, 0.083 g/t Au), ...
Correlation Between Disequilibrium Features and Mineral Chemistry at the Miocene Trayén Niyeu Volcano, Somún Curá Plateau, Northern Patagonia, Argentina
(Istituto Nazionale Di Oceanografia E Di Geofisica, 2013-11)
The Miocene Trayén Niyeu volcano (TNV) is the largest post-plateau volcanic building at the westernmost ranges of the mainly Oligocene Somún Curá volcanic shield. The TNV is formed by a large orthopyroxenebearing basandesitic ...
La Formación Bajo Pobre (Jurásico) en el este del Macizo del Deseado, Patagonia: vinculación con el Grupo Bahía LauraThe Bajo Pobre Formation Jurassic in the eastern Deseado Massif, Patagonia: Relationship with the Bahía Laura Group
(Asociación Geológica Argentina, 2006-12)
Se describen nuevos afloramientos de la Formación Bajo Pobre hallados en el sector oriental del Macizo del Deseado, provincia de Santa Cruz, Patagonia Argentina. Esta unidad, junto con el Grupo Bahía Laura, corresponden ...
Sedimentary record of a Late Cretaceous volcanic arc in central Patagonia: petrography, geochemistry and provenance of fluvial volcaniclastic deposits of the Bajo Barreal Formation, San Jorge Basin, Argentina
(Academic Press Ltd - Elsevier Science Ltd, 2009-06)
The Upper Cretaceous Bajo Barreal Formation (San Jorge Basin, Argentina) is a fluvial succession mostly composed of channel sandstones interbedded with thicker floodplain deposits dominated by tuffaceous strata. The goal ...
The ≥6-km Cuesta de Randolfo mylonite zone in Ordovician Famatinian peraluminous granites, NW Argentina: Strain-localization as a function of protolith composition
(Pergamon-Elsevier Science Ltd, 2021-12)
The Cuesta de Randolfo mylonite zone (CRMZ) in the southern Puna of Argentina comprises ≥6-km of moderately to steeply dipping proto-to ultramylonites developed in peraluminous intrusive rocks of the Famatinian arc. From ...