A review of Late Cretaceous to Quaternary palaeogeography of the southern Andes

摘要: The southern Andes were created by two main cycles of shallow to flat subduction settings that followed steepening zones starting in Late Cretaceous times. first wave contractional deformation and Andean uplift migrated through the continental interior as a result zones, one developed between 36 39°S other 40 46°S, associated with expansion arc magmatism. In latest Eocene times, its northernmost segment flattened, increasing compression mountains far foreland area, whereas, south, zone provoked extensional collapse vast sectors fold thrust belt within-plate whole area 44°S retreated large late Oligocene inducing asthenosphere injection formation plateaux zone, well narrow basins induced incipient hinterland zone. Miocene was characterized development three expanded differentially 34°30′ 50°S. These again expansions lateral construction belt. Their evolution finished Pliocene Quaternary times eruption widespread still governs important present retroarc area. Finally, an setting could have been developing 35 last 3 Ma renewed at these latitudes. Cyclic Andes, therefore repeated behaviour constructional stages collapsing ones voluminous volcanism, be consequence cycle imposed docking seismic ridges, achieved (?) Other factors, such collision highly serpentinized isostatically buoyant plateaux, fracture oceanic are also considered trigger settings. © 2011 Linnean Society London, Biological Journal Society, 2011, 103, 250–268. Los del Sur fueron creados traves de dos ciclos principales en los cuales la zona subduccion se subhorizontalizo y posteriormente empino diferentes segmentos comenzando el Cretacico superior. La primer fase contraccional migro desde borde placas hacia relacion al desarrollo zonas subhorizontal, una desarrollada entre 36° otra 40° ambas relacionadas oriental magmatismo arco volcanico. En mas alto hasta Eoceno, seccion subhorizontal septentrional siguio acentuandose asociandose asi levantamiento relieves montanosos lejanos limite placas, tiempo que sector meridional rapidamente lo provoco colapso previos efusion productos volcanicos intraplaca. Posteriormente, forma conjunta tiempos Oligocenos superiores provocando inyeccion astenosfera por debajo placa Sudamericana consecuentemente formacion grandes plateaus cuencas extensionales superpuestos andinos previamente ascendidos. El Mioceno superior esta caracterizado tres localizadas 34°30′y similar casos anteriores, estas asociaron construccion relieve andino. Su finalizo Plioceno Cuaternario emplazamiento asociados extension afecto aun afecta sectores Patagonia Centrales Australes. Finalmente, un segmento 35° podria estar relacionado incipiente somera ultimos 3 Ma. Esta ciclicidad someras Sur, ha determinado comportamiento cual han sucedido fases contraccionales seguidas asociadas importante volcanismo intraplaca ser consecuencia colision dorsales sismicas contra margen, inicialmente Eoceno Otros factores tales como oceanicos fractura altamente serpentinizadas con alta flotabilidad isostatica son tambien considerados gatilladores procesos someros.