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Capítulo de Libro

Neogene Growth of the Patagonian Andes

Título del libro: The Evolution of the Chilean-Argentinean Andes

Folguera Telichevsky, AndresIcon ; Encinas, Alfonso; Alvarez Pontoriero, OrlandoIcon ; Orts, Darío LeandroIcon ; Gianni, Guido MartinIcon ; Echaurren Gonzalez, AndresIcon ; Litvak, Vanesa DafneIcon ; Navarrete Granzotto, César RodrigoIcon ; Selles, Daniel; Tobal, Jonathan ElíasIcon ; Ramos, Miguel EstebanIcon ; Fennell, Lucas MartínIcon ; Fernández Paz, LucíaIcon ; Gimenez, Mario ErnestoIcon ; Martinez, Patricia; Ruiz, Francisco; Iannelli, SofíaIcon
Otros responsables: Folguera Telichevsky, AndresIcon ; Contreras-Reyes, Eduardo; Heredia, Nemesio; Encinas, Alfonso; Iannelli, SofíaIcon ; Oliveros, Verónica; Dávila, Federico M.; Collo, GildaIcon ; Giambiagi, Laura BeatrizIcon ; Maksymowicz, Andrei; Iglesia Llanos, María Paula; Turienzo, Martín; Naipauer, MaximilianoIcon ; Orts, Darío LeandroIcon ; Litvak, Vanesa DafneIcon ; Álvarez, Orlando; Arriagada, César
Fecha de publicación: 2018
Editorial: Springer International Publishing
ISBN: 978-3-319-67773-6
Idioma: Inglés
Clasificación temática:
Geología

Resumen

After a Late Cretaceous to Paleocene stage of mountain building, the North Patagonian Andes were extensionally reactivated leading to a period of crustal attenuation. The result was the marine Traiguén Basin characterized by submarine volcanism and deep-marine sedimentation over a quasi-oceanic basement floor that spread between 27 and 22 Ma and closed by 20 Ma, age of syndeformational granitoids that cut the basin infill. As a result of basin closure, accretion of the Upper Triassic metamorphic Chonos Archipelago took place against the Chilean margin, overthrusting a stripe of high-density (mafic) rocks on the upper crust, traced by gravity data through the Chonos Archipiélago. After this, contractional deformation had a rapid propagation between 19 and 14.8 Ma rebuilding the Patagonian Andes and producing a wide broken foreland zone. This rapid advance of the deformational front, registered in synorogenic sedimentation, was accompanied at the latitudes of the North Patagonian Andes by an expansion of the arc magmatism between 19 and 14 Ma, suggesting a change in the subduction geometry at that time. Then a sudden retraction of the contractional activity took place around 13.5?11.3 Ma, accompanied by a retraction of magmatism and an extensional reactivation of the Andean zone that controlled retroarc volcanism up to 7.3?(4.6?) Ma. This particular evolution is explained by a shallow subduction regime in the northernmost Patagonian Andes, probably facilitated by the presence of the North Patagonian massif lithospheric anchor that would have blocked drag basal forces creating low-pressure conditions for slab shallowing. Contrastingly, to the south, the accretion of the Chonos Archipelago explains rapid propagation of the deformation across the retroarc zone. These processes occurred at the time of rather orthogonal to the margin convergence between Nazca and South American plates after a long period of high oblique convergence. Finally, convergence deceleration in the last 10 My could have led to extensional relaxation of the orogen.
Palabras clave: Patagonia , Fold and thrust belt , Foreland basin
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/99740
URL: https://link.springer.com/chapter/10.1007/978-3-319-67774-3_19
DOI: http://dx.doi.org/10.1007/978-3-319-67774-3_19
Colecciones
Capítulos de libros(IDEAN)
Capítulos de libros de INSTITUTO DE ESTUDIOS ANDINOS "DON PABLO GROEBER"
Citación
Folguera Telichevsky, Andres; Encinas, Alfonso; Alvarez Pontoriero, Orlando; Orts, Darío Leandro; Gianni, Guido Martin; et al.; Neogene Growth of the Patagonian Andes; Springer International Publishing; 2018; 485-511
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