IDEAN   23403
INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"
Unidad Ejecutora - UE
artículos
Título:
. Tectono-stratigraphic evolution of the Andean Orogen between 31º and 37ºS (Chile and Western Argentina).
Autor/es:
CHARRIER, R., RAMOS, V.A., TAPIA, F. Y SAGRIPANTI, L.
Revista:
Geological Society, London, Special Publication
Editorial:
Geological Society of London
Referencias:
Lugar: London; Año: 2015 vol. 399 p. 13 - 61
ISSN:
0267-9914
Resumen:
In this classic segment, many tectonic processes, like flat-subduction, terrane accretionand steepening of the subduction, among others, provide a robust framework for their understanding. Five orogenic cycles, with variations in location and type of magmatism, tectonicregimes and development of different accretionary prisms, show a complex evolution. Accretionof a continental terrane in the Pampean cycle exhumed lower to middle crust in Early Cambrian.The Ordovician magmatic arc, associated metamorphism and foreland basin formation characterized the Famatinian cycle. In Late Devonian, the collision of Chilenia and associated highpressure/low-temperature metamorphism contrasts with the late Palaeozoic accretionary prisms. Contractional deformation in Early to Middle Permian was followed by extension and rhyolitic (Choiyoi) magmatism. Triassic to earliest Jurassic rifting was followed by subduction and extension, dominated by Pacific marine ingressions, during Jurassic and Early Cretaceous. The Late Cretaceous was characterized by uplift and exhumation of the Andean Cordillera. An Atlanticingression occurred in latest Cretaceous. Cenozoic contraction and uplift pulses alternate with Oligocene extension. Late Cenozoic subduction was characterized by the Pampean flat-subduction, the clockwise block tectonic rotations in the normal subduction segments and the magmatism in Payenia. These processes provide evidence that the Andean tectonic model is far from a straightforward geological evolution.