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Abstract:

In central-western Argentina, an Early Paleozoic belt including mafic-ultramafic bodies, marine metasedimentary rocks and high-pressure rocks occur along the western margin of the Precordillera and in the Frontal Cordillera. First pressure-temperature estimates are presented here for low-grade rocks of the southern sector of this belt based on two metasedimentary and one metabasaltic sample from the Peñasco Formation. Peak metamorphic conditions resulted within the range of 345–395 °C and 7.0–9.3 kbar within the high-pressure greenschist facies. The corresponding low metamorphic gradient of 13 °C/km is comparable with subduction related geothermal gradients. Comparison between these results and data from other localities of the same collision zone (Guarguaraz and Colohuincul complexes) confirms a collision between Chilenia and the composite margin of western Gondwana and suggests a stronger crustal thickening in the south of the belt, causing exhumation of more deeply buried sequences. During the Early Paleozoic a long-lived marine sedimentation coupled with the intrusion of MORB-like basalts occurred along a stable margin before the collision event. This contrasts with the almost contemporaneous sedimentation registered during accretion in accretionary prism settings and additionally proves the development of a collision zone along western Precordillera and the eastern Frontal Cordillera as well as the existence of Chilenia as a separate microcontinent. © 2016 Elsevier Ltd

Registro:

Documento: Artículo
Título:High-pressure/low-temperature metamorphism in the collision zone between the Chilenia and Cuyania microcontinents (western Precordillera, Argentina)
Autor:Boedo, F.L.; Willner, A.P.; Vujovich, G.I.; Massonne, H.-J.
Filiación:Instituto de Estudios Andinos “Don Pablo Groeber” (UBA-CONICET), Int. Güiraldes 2160 (1428), Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
Institut für Mineralogie und Kristallchemie, Universität Stuttgart, Azenbergstr. 18, Stuttgart, 70174, Germany
Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität, Bochum, 44780, Germany
Palabras clave:Devonian; Geothermobarometry; Greenschist facies; Mafic-ultramafic belt; Peñasco formation; Phengite; Pseudosections; collision zone; Devonian; geobarometry; geothermometry; Gondwana; greenschist facies; mafic rock; metamorphism; phengite; ultramafic rock; Argentina; Precordillera
Año:2016
Volumen:72
Página de inicio:227
Página de fin:240
DOI: http://dx.doi.org/10.1016/j.jsames.2016.09.009
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v72_n_p227_Boedo

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Citas:

---------- APA ----------
Boedo, F.L., Willner, A.P., Vujovich, G.I. & Massonne, H.-J. (2016) . High-pressure/low-temperature metamorphism in the collision zone between the Chilenia and Cuyania microcontinents (western Precordillera, Argentina). Journal of South American Earth Sciences, 72, 227-240.
http://dx.doi.org/10.1016/j.jsames.2016.09.009
---------- CHICAGO ----------
Boedo, F.L., Willner, A.P., Vujovich, G.I., Massonne, H.-J. "High-pressure/low-temperature metamorphism in the collision zone between the Chilenia and Cuyania microcontinents (western Precordillera, Argentina)" . Journal of South American Earth Sciences 72 (2016) : 227-240.
http://dx.doi.org/10.1016/j.jsames.2016.09.009
---------- MLA ----------
Boedo, F.L., Willner, A.P., Vujovich, G.I., Massonne, H.-J. "High-pressure/low-temperature metamorphism in the collision zone between the Chilenia and Cuyania microcontinents (western Precordillera, Argentina)" . Journal of South American Earth Sciences, vol. 72, 2016, pp. 227-240.
http://dx.doi.org/10.1016/j.jsames.2016.09.009
---------- VANCOUVER ----------
Boedo, F.L., Willner, A.P., Vujovich, G.I., Massonne, H.-J. High-pressure/low-temperature metamorphism in the collision zone between the Chilenia and Cuyania microcontinents (western Precordillera, Argentina). J. South Am. Earth Sci. 2016;72:227-240.
http://dx.doi.org/10.1016/j.jsames.2016.09.009