Artículo

Echaurren, A.; Oliveros, V.; Folguera, A.; Ibarra, F.; Creixell, C.; Lucassen, F. "Early andean tectonomagmatic stages in North Patagonia: Insights from field and geochemical data" (2017) Journal of the Geological Society. 174(3):405-421
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Abstract:

The Andes in northern Patagonia are mainly formed by Mesozoic magmatic units: the mostly Jurassic-Cretaceous North Patagonian Batholith and volcanism of the Jurassic Lago La Plata (Ibáñez) Formation as well as the mid-Cretaceous Divisadero Group. These rocks represent the development of a magmatic belt through Jurassic-mid-Cretaceous time, during a switch of the tectonic regime from extension to compression. To study arc evolution during this transition, we carried out fieldwork and geochemical sampling at c. 43°S, clarifying structural relationships and characterizing the magmatic sources. Multi-element diagrams for both volcanic units suggest a slab-derived signature, whereas isotopic ratios (Sr-Nd-Pb) indicate parental melts sourced from the subduction-modified asthenospheric mantle interacting with crustal sources during their emplacement. An angular unconformity is identified between the synextensional Jurassic volcanic rocks and Lower Cretaceous sedimentary rocks beneath the mid-Cretaceous sequences. Although this deformational event was simultaneous with generalized overriding plate compression, geochemical ratios indicate an immature Aptian-Albian arc with no associated crustal thickening. Late Jurassic to mid-Cretaceous arc settlement after a trenchward retraction of magmatism from the foreland between c. 41 and 45°S, with an associated increase in slab dip angle, may have provoked crustal softening facilitating the subsequent initial fold-thrust belt growth. © 2017 The Author(s). Published by The Geological Society of London. All rights reserved.

Registro:

Documento: Artículo
Título:Early andean tectonomagmatic stages in North Patagonia: Insights from field and geochemical data
Autor:Echaurren, A.; Oliveros, V.; Folguera, A.; Ibarra, F.; Creixell, C.; Lucassen, F.
Filiación:Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Instituto de Estudios Andinos, Conicet-Universidad de Buenos Aires, Buenos Aires, C1428EHA, Argentina
Departamento de Ciencias de la Tierra, Universidad de Concepción, Concepción, 4030000, Chile
Servicio Nacional de Geología y Minería, Santiago, 7500000, Chile
Isotope Geochemistry Laboratory, Department of Geoscience and MARUM-Center for Marine Environmental Sciences, University of Bremen, Bremen, D-28334, Germany
Palabras clave:Geochemistry; Lead; Neodymium; Strontium; Tectonics; Volcanic rocks; Volcanoes; Angular unconformity; Crustal thickenings; Fold-thrust belts; Geochemical data; Lower Cretaceous; Northern patagonia; Plate compressions; Structural relationship; Sedimentary rocks; Andean orogeny; arc-arc collision; batholith; compression; Cretaceous; crustal structure; extensional tectonics; isotopic ratio; magmatism; tectonic evolution; tectonic setting; volcanism; Andes; Patagonia
Año:2017
Volumen:174
Número:3
Página de inicio:405
Página de fin:421
DOI: http://dx.doi.org/10.1144/jgs2016-087
Título revista:Journal of the Geological Society
Título revista abreviado:J. Geol. Soc.
ISSN:00167649
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00167649_v174_n3_p405_Echaurren

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Citas:

---------- APA ----------
Echaurren, A., Oliveros, V., Folguera, A., Ibarra, F., Creixell, C. & Lucassen, F. (2017) . Early andean tectonomagmatic stages in North Patagonia: Insights from field and geochemical data. Journal of the Geological Society, 174(3), 405-421.
http://dx.doi.org/10.1144/jgs2016-087
---------- CHICAGO ----------
Echaurren, A., Oliveros, V., Folguera, A., Ibarra, F., Creixell, C., Lucassen, F. "Early andean tectonomagmatic stages in North Patagonia: Insights from field and geochemical data" . Journal of the Geological Society 174, no. 3 (2017) : 405-421.
http://dx.doi.org/10.1144/jgs2016-087
---------- MLA ----------
Echaurren, A., Oliveros, V., Folguera, A., Ibarra, F., Creixell, C., Lucassen, F. "Early andean tectonomagmatic stages in North Patagonia: Insights from field and geochemical data" . Journal of the Geological Society, vol. 174, no. 3, 2017, pp. 405-421.
http://dx.doi.org/10.1144/jgs2016-087
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Echaurren, A., Oliveros, V., Folguera, A., Ibarra, F., Creixell, C., Lucassen, F. Early andean tectonomagmatic stages in North Patagonia: Insights from field and geochemical data. J. Geol. Soc. 2017;174(3):405-421.
http://dx.doi.org/10.1144/jgs2016-087