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Late Cambrian – Early Ordovician magmatism in the Sierra de Pie de Palo, Sierras Pampeanas (Argentina): implications for the early evolution of the proto-Andean margin of Gondwana

Published online by Cambridge University Press:  18 July 2019

Carlos D. Ramacciotti Open the ORCID record for Carlos D. Ramacciotti [Opens in a new window] ,
César Casquet ,
Edgardo G. Baldo ,
Pablo H. Alasino ,
Carmen Galindo  and
Juan A. Dahlquist Open the ORCID record for Juan A. Dahlquist [Opens in a new window]
Carlos D. Ramacciotti*
Affiliation:
Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611, Ciudad Universitaria, X5016CA Córdoba, Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro de investigaciones en Ciencias de la Tierra (CICTERRA), Haya de la Torre s/n, Ciudad Universitaria, Córdoba, Argentina
César Casquet
Affiliation:
Departamento de Mineralogía y Petrología, Facultad de Ciencias Geológicas, Instituto de Geociencias(IGEO, CSIC), Universidad Complutense, 28040 Madrid, Spain
Edgardo G. Baldo
Affiliation:
Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611, Ciudad Universitaria, X5016CA Córdoba, Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro de investigaciones en Ciencias de la Tierra (CICTERRA), Haya de la Torre s/n, Ciudad Universitaria, Córdoba, Argentina
Pablo H. Alasino
Affiliation:
Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (Prov. de La Rioja-UNLaR-SEGEMAR-UNCa-CONICET), Entre Ríos y Mendoza s/n, Anillaco 5301, Argentina Instituto de Geología y Recursos Naturales, Centro de Investigación e Innovación Tecnológica, Universidad Nacional de La Rioja (INGeReN-CENIIT-UNLaR), Avenida Gobernador Vernet y Apostol Felipe, 5300, La Rioja, Argentina
Carmen Galindo
Affiliation:
Departamento de Mineralogía y Petrología, Facultad de Ciencias Geológicas, Instituto de Geociencias(IGEO, CSIC), Universidad Complutense, 28040 Madrid, Spain
Juan A. Dahlquist
Affiliation:
Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611, Ciudad Universitaria, X5016CA Córdoba, Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro de investigaciones en Ciencias de la Tierra (CICTERRA), Haya de la Torre s/n, Ciudad Universitaria, Córdoba, Argentina
*
Author for correspondence: Carlos D. Ramacciotti, Email: carlosramacciotti@yahoo.com.ar
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Abstract

The Sierra de Pie de Palo, in the Argentinean Sierras Pampeanas (Andean foreland), consists of a Mesoproterozoic basement and an Ediacaran – upper Cambrian sedimentary cover that underwent folding, thrusting and metamorphism during the Ordovician Famatinian orogeny. Mafic rocks and granitoids of the easternmost Sierra de Pie de Palo provide information about the magmatic activity at the proto-Andean margin of Gondwana during late Cambrian – Early Ordovician time. Magmatic activity began in the Sierra de Pie de Palo as dykes, sills and small intrusions of tholeiitic gabbros between 490 and 470 Ma, before shortening and regional metamorphism. Variable mantle sources (Nd depleted mantle age, TDM between 1.7 and 1.3 Ga) were involved in the mafic magmatism. Nd-isotope signatures were probably inherited from a Mesoproterozoic subcontinental mantle. Mafic magmatism was coincident with collapse of a Cambrian carbonate-siliciclastic platform that extended along SW Gondwana, and was probably coeval with the beginning of subduction. After mafic magmatism, peraluminous granitoids were emplaced in the Sierra de Pie de Palo along ductile shear zones during a contractional tectonic phase, coeval with moderate to high P/T metamorphism, and with the Cordilleran-type magmatic arc that resulted from a flare-up at c. 470 Ma. Granitoids resulted mainly from partial melting of metasedimentary rocks, although some hybridization with juvenile magmas and/or rocks cannot be ruled out. The evidence shown here further implies that the Pie de Palo block was part of the continental upper plate during the Famatinian subduction, and not an exotic block that collided with the Gondwana margin.

Keywords

Famatinian magmatismU–Pb SHRIMP geochronologyactive continental marginSW Gondwana margin
Type
Original Article
Information
Geological Magazine , Volume 157 , Issue 2 , February 2020 , pp. 321 - 339
Copyright
© Cambridge University Press 2019 

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