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- W2130436986 abstract "New KAr ages of Cenozoic volcanic rocks from the southeastern Peruvian Andes, where geochronologic data are still scarce, are presented in this paper. North of Lake Titicaca, the new data provide evidence of various late Oligocene to Pliocene volcanic pulses. In the Crucero intramontane basin (14°20′S, 70°W), basaltic andesites, dacites, rhyolites, and ash-flow tuffs interbedded in fluvial and lacustrine sediments yield ages ranging from 25 to 22 Ma, characterizing a late Oligocene to early Miocene volcanic pulse. In the same area, widespread acidic ash-flow tuffs and rhyolites, with ages ranging between 17 and 12 Ma, demonstrate that volcanism was also active during mid- to late Miocene times. Finally, the younger ages show that volcanism was still active during the mid-Pliocene and Pleistocene in the southeastern Peruvian Andes. Se presentan nuevas edades radiocronológicas KAr de rocas volcánicas cenozoicas de los Andes Surorientales del Perú de donde se conocen todavía pocos datos geocronológicos. Al norte del Lago Titicaca, estas nuevas dataciones demuestran la existencia de varios pulsos de actividad volcánica entre el Oligoceno superior y el Pleistoceno. En la cuenca intramontañosa de Crucero (14°20′S, 70°W), andesitas basálticas, dacitas, riolitas e ignimbritas intercaladas en sedimentos aluviales y lacustres, han dado edades con rango de 25 hasta 22 Ma, lo que evidencia una fase de intenso volcanismo durante el Oligoceno tardío al Mioceno temprano. En la misma zona, grandes mesetas de ignimbritas y riolitas, con edades comprendidas entre 17 y 12 Ma, atestiguan de una fuerte actividad volcánica durante el Mioceno medio a tardío. Por fin, edades recientes comprueban una actividad volcánica significativa en los Andes Surorientales del Perú durante el Plioceno y el Pleistoceno." @default.
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- W2130436986 date "1988-01-01" @default.
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- W2130436986 title "New Cenozoic KAr ages on volcanic rocks from the eastern High Andes, southern Peru" @default.
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- W2130436986 doi "https://doi.org/10.1016/0895-9811(88)90035-1" @default.
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