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- W2023172148 abstract "A regional mapping program associated with radiometric age dating has provided evidence of seven deformation pulses in the Andean orogenic cycle in part of southern Peru. These are the Peruvian (Late Cretaceous), Incaic (Eocene), and five Quechua phases defined as D1 to D5. The D1 phase (early Oligocene) folded molasse deposits in the Western Cordillera; the D2 phase (late Oligocene to early Miocene) folded volcanics of the Western Cordillera; the D3 phase (middle Miocene) folded the molasse deposits in the Altiplano; the D4 (late Miocene) folded lacustrine sediments in the central part of the Western Cordillera; and the D5 phase was a major gravity slide in the Altiplano. Several faults and fault zones, known as the Chupa, Calapuja, Lagunillas, and Laraqueri Faults, are identified. They form the boundaries to Paleozoic basement blocks which appear to have acted as buttresses or barriers to the penetration of some deformation events. In the case of the D5 phase, the gravity slide was preceded by uplift and tilting of a Paleozoic block. Un programa regional de mapeo asociado con dataciones radiométricas ha proporcionado la evidencia de siete pulsos de deformación en el ciclo orogénico Andino en la parte sur del Perú. Estos ciclos incluyen el Peruano (Cretácico superior), Incaico (Eoceno) y cinco fases sel Quechua definidos como D1 a D5. La fase D1 (Oligoceno temprano) plegó los depósitos de molasa de la Cordillera Occidental; la fade D2 (Oligoceno tardío-Mioceno temprano) plegó las rocas volcánicas de la Cordillera Occidental; la fase D3 (Mioceno medio) plegó los depósitos de molasa del Altiplano; la fase D4 (Mioceno tardió) plegó los sedimentos lacustres de la parte occidental de la Cordillera Occidental; y fase D5 (Mioceno tardío) fue un deslizamiento gravitacional en el Altiplano. Varias fallas y zonas de falla, conocidas como las fallas de Chupa, Calapuja, Lagunillas y Laraqueri, fueron identificadas. Los límites de bloques Paleozoicos aparentan haber sido contrafuertes u obstáculos contra la penetración de algunos eventos de deformación. En el caso de la fase D5, el deslizamiento de gravedad fue antecedido por levantamiento y basculamiento de un bloque del basamento Paleozoico." @default.
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- W2023172148 date "1989-01-01" @default.
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- W2023172148 title "Deformation events in the Andean orogenic cycle in the Altiplano and Western Cordillera, southern Peru" @default.
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- W2023172148 doi "https://doi.org/10.1016/0895-9811(89)90033-3" @default.
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