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The Maz Metasedimentary Series (Western Sierras Pampeanas, Argentina). A relict basin of the Columbia supercontinent?

Published online by Cambridge University Press:  14 October 2021

C. D. Ramacciotti Open the ORCID record for C. D. Ramacciotti [Opens in a new window] ,
C. Casquet ,
E. G. Baldo ,
R. J. Pankhurst ,
S. O. Verdecchia ,
C. M. Fanning  and
J. A. Murra
C. D. Ramacciotti*
Affiliation:
Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611, Ciudad Universitaria, X5016CACórdoba, Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro de investigaciones en Ciencias de la Tierra (CICTERRA), Av. Vélez Sarsfield 1611, Ciudad Universitaria, Córdoba, Argentina
C. Casquet
Affiliation:
Departamento de Mineralogía y Petrología, Universidad Complutense (UCM), 28040Madrid, Spain
E. G. Baldo
Affiliation:
Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611, Ciudad Universitaria, X5016CACórdoba, Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro de investigaciones en Ciencias de la Tierra (CICTERRA), Av. Vélez Sarsfield 1611, Ciudad Universitaria, Córdoba, Argentina
R. J. Pankhurst
Affiliation:
Visiting Research Associate, British Geological Survey, Keyworth, NottinghamNG12 5GG, UK
S. O. Verdecchia
Affiliation:
Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611, Ciudad Universitaria, X5016CACórdoba, Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro de investigaciones en Ciencias de la Tierra (CICTERRA), Av. Vélez Sarsfield 1611, Ciudad Universitaria, Córdoba, Argentina
C. M. Fanning
Affiliation:
Australian National University, Research School of Earth Sciences, ACT, Canberra, 0200, Australia
J. A. Murra
Affiliation:
Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611, Ciudad Universitaria, X5016CACórdoba, Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro de investigaciones en Ciencias de la Tierra (CICTERRA), Av. Vélez Sarsfield 1611, Ciudad Universitaria, Córdoba, Argentina
*
Author for correspondence: C. D. Ramacciotti, Email: [email protected]
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Abstract

The Maz Metasedimentary Series is part of the Maz Complex that crops out in the sierras of Maz and Espinal (Western Sierras Pampeanas) and in the Sierra de Umango (Andean Frontal Cordillera), northwestern Argentina. The Maz Complex is found within a thrust stack of Silurian age, which later underwent open folding. The Maz Metasedimentary Series mainly consists of medium-grade garnet–staurolite–kyanite–sillimanite schists and quartzites, with minor amounts of marble and calc-silicate rocks. Transposed metadacite dykes have been recognized along with amphibolites, metagabbros, metadiorites and orthogneisses. Schist, quartzite and metadacite samples were analysed for SHRIMP U–Pb zircon dating. The Maz Metasedimentary Series is polymetamorphic and records probably three metamorphic events during the Grenvillian orogeny, at c. 1235, 1155 and 1035 Ma, and a younger metamorphism at c. 440–420 Ma resulting from reactivation during the Famatinian orogeny. The sedimentary protoliths were deposited between 1.86 and 1.33–1.26 Ga (the age of the Andean-type Grenvillian magmatism recorded in the Maz Complex), and probably before 1.75 Ga. The main source areas correspond to Palaeoproterozoic and, to a lesser magnitude, Meso-Neoarchaean rocks. The probable depositional age and the detrital zircon age pattern suggest that the Maz Metasedimentary Series was laid down in a basin of the Columbia supercontinent, mainly accreted between 2.1 and 1.8 Ga. The sedimentary sources were diverse, and we hypothesize that deposition took place before Columbia broke up. The Rio Apa block, and the Río de la Plata, Amazonia and proto-Kalahari cratons, which have nearby locations in the palaeogeographic reconstructions, were probably the main blocks that supplied sediments to this basin.

Keywords

Sierra de MazSierras PampeanasArgentinaColumbia supercontinentU–Pb SHRIMP zircon dating
Type
Original Article
Information
Geological Magazine , Volume 159 , Issue 3 , March 2022 , pp. 309 - 321
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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