Capítulo de Libro
Growth of the Southern Patagonian Andes (46 -53°S) and its relation with subduction processes
Título del libro: Growth of the Southern Andes
Ghiglione, Matias
; Ramos, Victor Alberto
; Cuitiño, José Ignacio
; Barberon, Vanesa
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Otros responsables:
Folguera, Andrés; Naipauer, Maximiliano
; Sagripanti, Lucía
; Ghiglione, Matias
; Orts, Darío Leandro
; Giambiagi, Laura Beatriz
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Fecha de publicación:
2016
Editorial:
Springer
ISBN:
978-3-319-23059-7
Idioma:
Inglés
Clasificación temática:
Resumen
The Cretaceous-Cenozoic evolution of the Southern Patagonian Andes is one of the most prominent examples of coupling between subduction processes and climatic, magmatic, deformational, and sedimentary events. Three orogenic and magmatic cycles can be particularly related to processes in the subduction zone (1) Late Cretaceous closure of the Rocas Verdes marginal basin, (2) Paleogene collisionof the Farallón-Aluk seismic ocean ridge, and (3) Miocene subduction of the Chile seismic ridge beneath South America. Andean orogenic growth started during Late Cretaceous times, in a tectonic scenario that included the Rocas Verdes back-arc oceanic basin, widening from 49°S toward the south. The Andean segment south of 49°S experienced a strong Cenomanian?Santonian deformational event during theclosure of the back-arc basin and progressive subduction of its ocean floor. The final closure produced the Coniacian?Santonian exhumation of the Sarmiento Ophiolitic Complex and propagation of the orogenic front toward the foreland. The second cycle, during Paleogene deformation, coincided with an Eocene volcanic arc gap, and seems to be related to the Fallarón-Phoenix seismic ridge collision. The resulting slab window produced OIB volcanic plateaux represented by the Chile Chico and Posadas Basalts, erupted in the foothills and retroarc. The third cycle of accelerated Andean uplift started during the Oligocene, as a consequence of orthogonal and fast subduction of young lithosphere, while the Chile seismic ridge between Antarctica and Nazca was approaching the trench. Kinematic plate reconstructions show that at approximately 14?18 Ma the Chile oceanic ridge entered the South America trench and migrated northward from 53°S to its present-day position at 46°S. The early Miocene ridge collision and resulting slab window produced an extensive OIB magmatism between 10 and 3 Ma in extra-Andean Patagonia. The space-time unraveling of tectonic uplift is well known from geochronometers, and shows a migration from the basement domain to the external fold and thrust belt accompanied by lower Miocene synorogenic sedimentation. Orogenic growth led to middle Miocene rain shadow in the foothills, followed by the late Miocene?Pliocene desertification of Patagonia.
Palabras clave:
Patagonian andes
,
Patagonia
,
Austral basin
,
Fold and thrust belt
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Identificadores
Colecciones
Capítulos de libros(CCT-CENPAT)
Capítulos de libros de CTRO.CIENTIFICO TECNOL.CONICET - CENPAT
Capítulos de libros de CTRO.CIENTIFICO TECNOL.CONICET - CENPAT
Capítulos de libros(IDEAN)
Capítulos de libros de INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"
Capítulos de libros de INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"
Capítulos de libros(IEGEBA)
Capítulos de libros de INSTITUTO DE ECOLOGIA, GENETICA Y EVOLUCION DE BS. AS
Capítulos de libros de INSTITUTO DE ECOLOGIA, GENETICA Y EVOLUCION DE BS. AS
Capítulos de libros(IPGP)
Capítulos de libros de INSTITUTO PATAGONICO DE GEOLOGIA Y PALEONTOLOGIA
Capítulos de libros de INSTITUTO PATAGONICO DE GEOLOGIA Y PALEONTOLOGIA
Citación
Ghiglione, Matias; Ramos, Victor Alberto; Cuitiño, José Ignacio; Barberon, Vanesa; Growth of the Southern Patagonian Andes (46 -53°S) and its relation with subduction processes; Springer; 2016; 201-240
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