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Jose A. Naranjo,Fernando Henrquez,Jan O. Nystrom
Pág. 110 - 120
Studies of drill cores from the Pasos Blancos area at El Laco in the central Andes, northern Chile, give evidence of an intense and extensive subvolcanic contact-metasomatic process. This process resulted from shallow-level emplacement of very volatile-r...
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Marcia Munoz,Francisco Fuentes,Mario Vergara,Luis Aguirre,Jan Olov Nyström,Gilbert Feraud,Alain Demant
Pág. 109 - 140
The stratigraphy, chemistry and age of rocks assigned to the eastern portion of the Abanico Formation exposed along the El Volcán river valley, Principal Cordillera east of Santiago (30º50'S/70º12'-70º5'W), are reported and discussed. This ca. 3,300 m th...
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Mario Vergara,Jan O. Nystrom
Pág. 97 - 106
ABSTRACT. A back-arc setting for the Lower Cretaceous volcanic rocks in the Andean Cordillera of Central Chile (31-34°S), previously proposed on paleogeographic grounds, is consistent with their geochemical features. The rocks are basic to intermediate l...
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Francisco Munizaga,Juan Carlos Reyes,Jan Olov Nystrom
Pág. 189 - 195
RESUMEN. El distrito minero Cerro Negro agrupa depósitos estrato ligados de cobre tipo manto, hospedados en rocas sedimentarias volcanoclásticas, Sulfuros de Cerro Negro exhiben d34S en el rango -21,2 y -15,6 %0, lo cual contrasta con los valores en torn...
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Mario Vergara,Beatriz Levi,Jan O. Nystrom,Eugenia Fonseca,Carlos Roeschmann
Pág. 295 - 302
ABSTRACT. Stratigraphic sequences of Lower Cretaceous age occur in two belts along central Chile. Between 30° and 35°S, the western belt, situated in the Coast Range is composed of 7-14 km thick intra-arc and forearc sequences dominated by shoshonitic to...
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Beatriz Levi,Jan Olov Nystrom,Humberto Padilla,Mario Vergara
Pág. 83 - 88
Resumen. Las rocas volcanicas mesozoicas y cenozoicas de Chile central, excepto las del reciente, han sido afectadas por episodios de alteracion regional. Las asociaciones mineralogicas secundarias son, en general, metaestables y comprenden las siguiente...
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