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Francisco Hervé,Mauricio Calderón,Mark Fanning,Robert Pankhurst,Carlos W. Rapela,Paulo Quezada
Pág. 301 - 317
Previous work has shown that Devonian magmatism in the southern Andes occurred in two contemporaneous belts: one emplaced in the continental crust of the North Patagonian Massif and the other in an oceanic island arc terrane to the west, Chaitenia, which...
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Victor Maksaev,Javier Arancibia,Francisco Munizaga,Colombo Tassinari
Pág. 285 - 312
U-Pb detrital-zircon geochronology of two discrete outcrops of mica schists of the western border of the Domeyko Cordillera in the Region of Atacama, northern Chile, indicates that the maximum age of sedimentation of their protolith corresponds to the La...
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Sebastián O. Verdecchia,Juan Alberto Murra,Edgardo Gaspar Baldo,Cesar Casquet,Inmaculada Pascua-González,Julio Saavedra
Pág. 380 - 400
The metamorphic complex of Sierra de Los Llanos is composed of low- to high-grade metasedimentary rocks, namely phyllites, schists, gneisses and migmatites that out crop like large septa within lower Ordovician magmatic units. Cornubianite associated wit...
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Sebastian O. Verdecchia,Gilda Collo,Edgardo G. Baldo
Pág. 268 - 283
Two tectono-thermal metamorphic events, M1-D1 (S1, with associated white mica and chlorite: WM1-Chl1) and M2-D2 (S2, with development of WM2-Chl2), are established from polyphase white mica growth for low-grade units from the Ordovician metasedimentary s...
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Fernando Sepulveda,Sylvia Palma-Heldt,Francisco Herve,Mark Fanning
Pág. 375 - 397
The Duque de York Complex (DYC) is part ofthe low grade metamorphic accretionary complexes ofthe pre-Andean Patagonian 'basement'. lt is a sedimentary succession exposed along the westem margin of southemmost South America. New U-Pb zircon ages and palyn...
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Fernando G. Sardi
Pág. 3 - 18
The different rocks that host the tungsten-bearing quartz veins from central-eastern sector of the Famatina System (La Rioja, Argentina) are part of the crystalline basement of this unit. Petrographic and geochemical studies demonstrate that the emplacem...
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Stuart N. Thomson,Francisco Herve
Pág. 255 - 271
Fission-track (FT) analysis was performed on ten samples of detrital zircons from several pre-Late Jurassic metamorphic accretionary complexes at the ancestral Pacific margin of Gondwana in southern Chile (42-52°S) previously dated by U-Pb SHRIMP. Post-m...
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Paul Duhart,Michael McDonough,Jorge Munoz,Mark Martin,Michael Villeneuve
Pág. 179 - 208
The Bahía Mansa Metamorphic Complex (BMMC) consists of pelitic schists, metagreywackes, oceanic type mafic metavolcanics, and minor proportion of tectonically emplaced mafic and ultramafic bodies, mylonites to ultramylonites and rare trachytic intrusive ...
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Juan R. Franzese
Pág. 193 - 202
RESUMEN. El Complejo Piedra Santa es una unidad metamorfica de baja a intermedia gradiente P/T que forma parte del basamento premesozoico del area norpatagonica occidental, en la provincia de Neuquen (Argentina). Consiste en una secuencia derivada princi...
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Constantino Mpodozis,Richard Allmendinger
Pág. 167 - 197
ABSTRACT. Large scale Cretaceous extensional tectonics in the Andes of northern Chile (Puquios-Sierra Fraga, 27°S). Extensional structures are commonly inferred, but seldom observed or described in the Andean Orogen. In the Andes of Northern Chile, the S...
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