The origin of the Loncopué Trough in the retroarc of the Southern Central Andes from field, geophysical and geochemical data

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This work analyzes through field, geophysical, geochemical and geochronological data, a particular setting of the Southern Andes in which an extensional system is flanking the mountain front. This setting is represented by the Loncopué Trough, whose origin is discussed for this part of the Andes. Th...

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Autor principal: Rojas Vera, E.A
Otros Autores: Sellés, D., Folguera, A., Gímenez, M., Ruíz, F., Orts, D., Zamora Valcarce, G., Martínez, P., Bechis, F., Ramos, V.A
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: Elsevier 2014
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NEUQUEN BASIN
ARGENTINA
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100 1 |a Rojas Vera, E.A. 
245 1 4 |a The origin of the Loncopué Trough in the retroarc of the Southern Central Andes from field, geophysical and geochemical data 
260 |b Elsevier  |c 2014 
270 1 0 |m Rojas Vera, E.A.; IDEAN (UBA-CONICET), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria - Pabellón II, Intendente Güiraldes 2160, C1428EGA - CABAArgentina 
506 |2 openaire  |e Política editorial 
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520 3 |a This work analyzes through field, geophysical, geochemical and geochronological data, a particular setting of the Southern Andes in which an extensional system is flanking the mountain front. This setting is represented by the Loncopué Trough, whose origin is discussed for this part of the Andes. This work reconstructs 3-dimensionally the structure of this basin and its evolution through time, since Jurassic times as a series of isolated depocenters, to Late Cretaceous-Eocene times with the construction of a positive relief that subsequently was relaxed through two extensional stages during the late Oligocene-early Miocene and the Pliocene-Quaternary respectively. The last episode of extension is characterized by an initial stage with a series of caldera-collapses in the latest Pliocene-early Quaternary. This passed to a stage of development of a broad basaltic plateau in pre- and inter-glacial times, circumscribed with new radiometric data to the Pleistocene. Quaternary products in northern and central Loncopué Trough have chemical relations that are intermediate between the arc front and the southern Loncopué Trough volcanic rocks studied in previous works. Thus, retroarc eruptions would be part of an extended arc configuration that goes from typical arc series in the northern part of the trough to within-plate series in the south. Low elastic thicknesses computed from gravity data in this work correlate with the area of retroarc volcanic activity. Magnetic data have allowed determining the Curie isotherm, showing two areas of relatively abnormal heat flow, one along the Loncopué Trough itself and the other in the foreland zone. This scenario is discussed through three main hypotheses: an occurrence linked to a slab-steepening after a shallow subduction in the area; co-seismic crustal stretching linked to giant earthquakes in the subduction zone; and, finally slab-tearing associated with asthenospheric upwelling. © 2014 Elsevier B.V.  |l eng 
536 |a Detalles de la financiación: Secretaría de Ciencia y Técnica, Universidad de Buenos Aires, PICT - 2012-1490, 20020110100019 
536 |a Detalles de la financiación: We acknowledge Cesar Arriagada and Chief Editor An Yin for corrections that allowed improving the structure and descriptions in this manuscript. We specially acknowledge Peter Cobbold, Suzanne Kay and Ben Brooks for discussion. Special thanks to John Booker and Aurora Burd for the MT slice across the Payenia region. We acknowledge Midland Valley for 2D and 3DMove academic licenses. We acknowledge Segemar for magnetic data used in this work. This work was financed by the PIP 11220110100506 , UBACYT 20020110100019 , PICT - 2012-1490 . This is the R-145 contribution of the Instituto de Estudios Andinos “Don Pablo Groeber”. Appendix A 
593 |a Instituto de Estudios Andinos, CONICET-Universidad de Buenos Aires, Argentina 
593 |a Aurum Consultores, Santiago, Chile 
593 |a Instituto Volponi, Universidad de San Juan-CONICET, Argentina 
593 |a Instituto Volponi, Universidad de San Juan, Argentina 
593 |a Repsol S.A., Houston, TX, United States 
593 |a IIDyPCa, CONICET - Universidad Nacional de Río Negro, Argentina 
690 1 0 |a CRUSTAL ATTENUATION 
690 1 0 |a EXTENSION 
690 1 0 |a FOLD AND THRUST BELT 
690 1 0 |a SLAB TEARING 
690 1 0 |a SOUTHERN CENTRAL ANDES 
690 1 0 |a EARTHQUAKES 
690 1 0 |a EARTHQUAKES 
690 1 0 |a GEOCHEMISTRY 
690 1 0 |a GEOCHEMISTRY 
690 1 0 |a GEOCHRONOLOGY 
690 1 0 |a GEOCHRONOLOGY 
690 1 0 |a GEOPHYSICS 
690 1 0 |a GEOPHYSICS 
690 1 0 |a VOLCANIC ROCKS 
690 1 0 |a VOLCANIC ROCKS 
690 1 0 |a VOLCANOES 
690 1 0 |a VOLCANOES 
690 1 0 |a CENTRAL ANDES 
690 1 0 |a CENTRAL ANDES 
690 1 0 |a CRUSTAL ATTENUATION 
690 1 0 |a CRUSTAL ATTENUATION 
690 1 0 |a EXTENSION 
690 1 0 |a EXTENSION 
690 1 0 |a FOLD-AND-THRUST BELTS 
690 1 0 |a FOLD-AND-THRUST BELTS 
690 1 0 |a SLAB TEARING 
690 1 0 |a SLAB TEARING 
690 1 0 |a TECTONICS 
690 1 0 |a TECTONICS 
690 1 0 |a BASIN EVOLUTION 
690 1 0 |a CRUSTAL STRUCTURE 
690 1 0 |a DEPOCENTER 
690 1 0 |a EXTENSIONAL TECTONICS 
690 1 0 |a FOLD AND THRUST BELT 
690 1 0 |a GEOCHEMISTRY 
690 1 0 |a GEOCHRONOLOGY 
690 1 0 |a GEOPHYSICAL SURVEY 
690 1 0 |a SLAB 
690 1 0 |a SUBDUCTION ZONE 
690 1 0 |a ANDES 
651 4 |a NEUQUEN BASIN 
651 4 |a ARGENTINA 
651 4 |a NEUQUEN BASIN 
700 1 |a Sellés, D. 
700 1 |a Folguera, A. 
700 1 |a Gímenez, M. 
700 1 |a Ruíz, F. 
700 1 |a Orts, D. 
700 1 |a Zamora Valcarce, G. 
700 1 |a Martínez, P. 
700 1 |a Bechis, F. 
700 1 |a Ramos, V.A. 
773 0 |d Elsevier, 2014  |g v. 637  |h pp. 1-19  |p Tectonophysics  |x 00401951  |w (AR-BaUEN)CENRE-81  |t Tectonophysics 
856 4 1 |u https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921975837&doi=10.1016%2fj.tecto.2014.09.012&partnerID=40&md5=93e5e8a1dcc213bd2e71c1d6ef2c83c6  |y Registro en Scopus 
856 4 0 |u https://doi.org/10.1016/j.tecto.2014.09.012  |y DOI 
856 4 0 |u https://hdl.handle.net/20.500.12110/paper_00401951_v637_n_p1_RojasVera  |y Handle 
856 4 0 |u https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00401951_v637_n_p1_RojasVera  |y Registro en la Biblioteca Digital 
961 |a paper_00401951_v637_n_p1_RojasVera  |b paper  |c PE 
962 |a info:eu-repo/semantics/article  |a info:ar-repo/semantics/artículo  |b info:eu-repo/semantics/publishedVersion 
963 |a VARI 
999 |c 85041 

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