Middle to late Miocene extensional collapse of the North Patagonian Andes (41°30′-42°S)

The hinterland zone of the North Patagonian Andes between 41° and 43°S constitutes a poorly explored sector of the Andes, where no structural studies and scarce geochronological determinations have been carried out. This paper focuses on two isolated volcanic sections hosted at the main Andes, in wh...

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Autor principal: Tobal, J.E
Otros Autores: Folguera, A., Likerman, J., Naipauer, M., Sellés, D., Boedo, F.L, Ramos, V.A, Gimenez, M.
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Publicado: Elsevier 2015
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100 1 |a Tobal, J.E. 
245 1 0 |a Middle to late Miocene extensional collapse of the North Patagonian Andes (41°30′-42°S) 
260 |b Elsevier  |c 2015 
506 |2 openaire  |e Política editorial 
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520 3 |a The hinterland zone of the North Patagonian Andes between 41° and 43°S constitutes a poorly explored sector of the Andes, where no structural studies and scarce geochronological determinations have been carried out. This paper focuses on two isolated volcanic sections hosted at the main Andes, in which field evidence indicates a common synextensional origin. Geochronological data establish that this volcanic event occurred diachronously at the innermost sector of the evolving fold and thrust belt, during middle to late Miocene times. Therefore, the event was briefly coeval and postdated compressive tectonics recognized in the deformational front and correlative to the last phase of pluton emplacement of the North Patagonian Batholith. Local-scale topographic swath profiles performed in this work reveal negative topographic anomalies where normal faults were recognized. Moreover, regional swath profiles show not only a conspicuous depressed zone at the hinterland zone, where the studied sections are located, but also anomalously high altitudes at the foreland zone. In addition, calculated orogenic volumes increase in this sector of the fold and thrust belt, which agrees with recent shortening estimations. These topographic along-strike variations, in association with late Miocene extension following the main compressive stage in the area, are explained by a supercritical stage of the orogenic wedge that would have led to focused extension at the innermost sector of the fold and thrust belt. © 2015 Elsevier B.V.  |l eng 
593 |a Instituto de Estudios Andinos 'Don Pablo Groeber' (IDEAN), CONICET-Universidad de Buenos Aires, Argentina 
593 |a Aurum Consultores, Santiago, Chile 
593 |a Instituto Geofisico Sismologico Ing. Volponi, Universidad Nacional de San Juan, Argentina 
690 1 0 |a FOLD AND THRUST BELT 
690 1 0 |a HINTERLAND EXTENSIONAL TECTONICS 
690 1 0 |a NORTH PATAGONIAN ANDES 
690 1 0 |a VOLCANISM 
690 1 0 |a GEOCHRONOLOGY 
690 1 0 |a VOLCANOES 
690 1 0 |a EXTENSIONAL COLLAPSE 
690 1 0 |a EXTENSIONAL TECTONICS 
690 1 0 |a FOLD-AND-THRUST BELTS 
690 1 0 |a GEOCHRONOLOGICAL DETERMINATION 
690 1 0 |a NORTH PATAGONIAN ANDES 
690 1 0 |a PLUTON EMPLACEMENT 
690 1 0 |a STRUCTURAL STUDIES 
690 1 0 |a VOLCANISM 
690 1 0 |a TECTONICS 
690 1 0 |a EXTENSIONAL TECTONICS 
690 1 0 |a FOLD AND THRUST BELT 
690 1 0 |a MIOCENE 
690 1 0 |a NORMAL FAULT 
690 1 0 |a TOPOGRAPHY 
690 1 0 |a VOLCANISM 
690 1 0 |a ANDES 
690 1 0 |a PATAGONIA 
700 1 |a Folguera, A. 
700 1 |a Likerman, J. 
700 1 |a Naipauer, M. 
700 1 |a Sellés, D. 
700 1 |a Boedo, F.L. 
700 1 |a Ramos, V.A. 
700 1 |a Gimenez, M. 
773 0 |d Elsevier, 2015  |g v. 657  |h pp. 155-171  |p Tectonophysics  |x 00401951  |w (AR-BaUEN)CENRE-81  |t Tectonophysics 
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856 4 0 |u https://doi.org/10.1016/j.tecto.2015.06.032  |y DOI 
856 4 0 |u https://hdl.handle.net/20.500.12110/paper_00401951_v657_n_p155_Tobal  |y Handle 
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