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23.282  Articles
1 of 2.329 pages  |  10  records  |  more records»
Volcanic deposits can be included in two main groups: coherent and volcaniclastic. The former results from volcanic and sub-volcanic (syn-volcanic intrusions) effusive events, excluding autoclastic portions, and the second group, which is related to depos... see more

The State of Rio Grande do Sul has a complex Precambrian/Cambrian shield, which has been investigated for four decades. This complexity involves ages ranging from 2.55 Ga (possibly 3.3 Ga) to 550 Ma (and even 470 Ma). The three major juvenile accretionary... see more

The Porongos Metamorphic Complex (PMC) is composed of supracrustal rocks, predominantly pelitic micaschist, quartzite and felsic metavolcanic rocks. It represents the remnants of a Neoproterozoic sedimentary basin developed in the western Gondwana, now lo... see more

The Neuquen Basin constitutes one of the most conspicuous features of the Andean margin of Gondwana during Mesozoic times. The initial syn-rift infill (Late Triassic-Early Jurassic) of this ensialic extensional basin involved a profuse magmatic activity (... see more

Triassic volcanism in the Coastal Range of central Chile is represented by the Pichidangui Formation (31°54' to 32°15'S) composed of acid and basic lava flows and sub-volcanic intrusives with some sedimentary intercalations. Both rock types have been affe... see more

ABSTRACT. Stratigraphical, petrographical, geochronological and geochemical data available suggest that the various segments of the western margin of South America experienced a different geodynamic evolution throughout the Jurassic_ In the early Jurassic... see more

ABSTRACT. Between latitudes 37° and 46°S of the Andes, the Nazca-South America Plate convergence is currently slightly oblique, Postglacial volcanism has been continuous and intense, being expressed as numerous composite stratovolcanoes (SV) and hundreds ... see more

RESUMEN:En la zona de Cifuncho, sector sur de la Cordillera de la Costa de Antofagasta, hubo grandes variaciones laterales y secuenciales de facies durante el Lias, producidas en un ambiente marino asociado a volcanismo.La identificacion de material piroc... see more

Pacitan area is known as Tertiary volcanic arc in Java, as the result of subduction zone of the Indian-Australian Plate beneath the Eurasian Plate since Oligocene. It was superimposed volcanism which formed a wide area of hydrothermal alteration zone, res... see more

1 of 2.329 pages  |  10  records  |  more records»