Structure and development of the Andean system between 36° and 39°S

One of the main morphological changes along the Southern Central Andes occurs from 36° to 39°S. The northern portion is characterized by prominent basement structures and a thick-skinned orogenic front with relief of over 2000. m with a deep level of exhumation where more than 4. km of section has b...

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Autor principal: Rojas Vera, E.A
Otros Autores: Folguera, A., Zamora Valcarce, G., Bottesi, G., Ramos, V.A
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Publicado: 2014
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100 1 |a Rojas Vera, E.A. 
245 1 0 |a Structure and development of the Andean system between 36° and 39°S 
260 |c 2014 
270 1 0 |m Rojas Vera, E.A.; IDEAN (UBA-CONICET), Laboratorio de Tectónica Andina, Departamento de Geología, Universidad de Buenos AiresArgentina; email: erv081@yahoo.com.ar 
506 |2 openaire  |e Política editorial 
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504 |a Zamora Valcarce, G., (2007), p. 303. , Estructura y Cinemática de la faja plegada y corrida del Agrio, Cuenca Neuquina. PhD Thesis. Universidad de Buenos Aires, Buenos Aires; Zamora Valcarce, G., Zapata, T., Del Pino, D., Ansa, A., Structural evolution and magmatic characteristics of the Agrio fold-and-thrust belt (2006) Evolution of an Andean Margin: A Tectonic and Magmatic View from the Andes to the Neuquén Basin (35-39°S Lat), 407, pp. 125-145. , Geological Society of America, Special Paper 
504 |a Zamora Valcarce, G., Zapata, T., Ramos, V.A., Rodriguez, F., Bernanrdo, L.M., Evolución tectónica del frente andino en Neuquén (2009) Revista de la Asociación Geológica Argentina, 65, pp. 192-203 
504 |a Zapata, T., Brissón, I., Dzelalija, F., The role of basement in the Andean fold and thrust belt of the Neuquén Basin (1999) Proceedings Thrust Tectonics, pp. 122-124 
504 |a Zollner, W., Amos, A.J., (1973) Descripción geológica de la Hoja 32b, Chos Malal (Prov. Neuquén), Bulletin 143, , Servicio Geológico Minero Argentino, Buenos Aires 
520 3 |a One of the main morphological changes along the Southern Central Andes occurs from 36° to 39°S. The northern portion is characterized by prominent basement structures and a thick-skinned orogenic front with relief of over 2000. m with a deep level of exhumation where more than 4. km of section has been eroded. Contrastingly, the southern part is formed by mildly inverted basement structures restricted mainly to the hinterland zone, which reaches only 1500-1700. m relief. We quantify the variable contributions of two main contractional stages through the construction of three regionally balanced sections across the Andes, constrained by field and geophysical data. Extensional re-activation described for this segment in late Oligocene-early Miocene and Pliocene to Quaternary times, after the two main contractional episodes, suggests only 3. km of stretching that represents 30-10% of the original longitude. We, therefore, conclude that while initial Late Cretaceous to Eocene compression was similar along strike (~10-7. km), it is the contrasting degrees of Neogene shortening (~16-6. km) that have played the largest role in the along strike differences in structure and morphology along this portion of the southern Andes. Variable Neogene arc expansion could be responsible for the contrasting contractional deformation: In the north, late Miocene arc-related rocks cover most of the retroarc zone (>200. km with respect to the late Miocene arc front in the south), presumably driven by a shallow subduction episode in the area, whereas to the south they remain restricted to the continental drainage divide. Other factors involving architecture of previous rift structures, are proposed as additional mechanisms that accommodated variable shortening magnitudes through inversion. © 2013 Elsevier Ltd.  |l eng 
593 |a IDEAN (UBA-CONICET), Laboratorio de Tectónica Andina, Departamento de Geología, Universidad de Buenos Aires, Argentina 
593 |a Repsol, Exploración, Lima, Peru 
593 |a Y.P.F. S.A. Exploración, Buenos Aires, Argentina 
690 1 0 |a EXTENSIONAL REACTIVATION 
690 1 0 |a FOLD AND THRUST BELT 
690 1 0 |a NEOGENE CONTRACTION 
690 1 0 |a SOUTHERN CENTRAL ANDES 
690 1 0 |a EXHUMATION 
690 1 0 |a EXTENSIONAL TECTONICS 
690 1 0 |a FOLD AND THRUST BELT 
690 1 0 |a GEOMORPHOLOGY 
690 1 0 |a NEOGENE 
690 1 0 |a OROGENY 
690 1 0 |a STRUCTURAL GEOLOGY 
690 1 0 |a TECTONIC EVOLUTION 
690 1 0 |a ANDES 
700 1 |a Folguera, A. 
700 1 |a Zamora Valcarce, G. 
700 1 |a Bottesi, G. 
700 1 |a Ramos, V.A. 
773 0 |d 2014  |g v. 73  |h pp. 34-52  |p J. Geodyn.  |x 02643707  |t Journal of Geodynamics 
856 4 1 |u https://www.scopus.com/inward/record.uri?eid=2-s2.0-84890153878&doi=10.1016%2fj.jog.2013.09.001&partnerID=40&md5=f3cee31af94391a05efebaf540303c0d  |y Registro en Scopus 
856 4 0 |u https://doi.org/10.1016/j.jog.2013.09.001  |y DOI 
856 4 0 |u https://hdl.handle.net/20.500.12110/paper_02643707_v73_n_p34_RojasVera  |y Handle 
856 4 0 |u https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02643707_v73_n_p34_RojasVera  |y Registro en la Biblioteca Digital 
961 |a paper_02643707_v73_n_p34_RojasVera  |b paper  |c PE 
962 |a info:eu-repo/semantics/article  |a info:ar-repo/semantics/artículo  |b info:eu-repo/semantics/publishedVersion 
999 |c 84977