Abstract
In the Comechingones pegmatitic field, central Argentina, leucogranite and pegmatite bodies crop out in a relatively narrow (25 × 10 km) belt, and were emplaced synkinematically with the main deformational event of the crustal-scale Guacha Corral shear zone during the Early Ordovician (~ 475 Ma). These leucogranites and pegmatites are geochemically evolved rocks with high silica and alkalis, low Fe2O3, MgO, TiO2 and CaO, and high ASI values. The leucogranites display quite variable Sr and Nd isotope compositions (initial 87Sr/86Sr ratios from 0.7048 to 0.7170, and εNd values from + 2.0 to − 3.1), some of which do not overlap with almost any other pre-Famatinian rock from the Sierras de Córdoba. The major and trace element geochemistry and the particular Sr and Nd isotope compositions of the leucogranites are here explained by the following processes: (1) water-fluxed partial melting of amphibolites at relatively low P–T conditions generating currently unexposed granodioritic melts with unradiogenic 87Sr/86Sr ratios and radiogenic εNd values; (2) fractionation of mostly plagioclase and monazite leading to compositions close to the leucogranite melts; and (3) assimilation of metasedimentary rocks with crustal isotopic signatures, modelled by assimilation and fractional crystallization processes. The major, trace and isotope compositions of the pegmatites suggest a derivation from partial melting of the same metasedimentary protoliths of the Sierras de Córdoba that were assimilated by leucogranite melts. We propose a feedback relationship among deformation, anatexis, magma evolution and mass transfer in the context of such a crustal-scale shear zone in the foreland of the Famatinian orogen.
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Acknowledgements
This work has been financially supported by grants PICT1754/16 (Agencia Nacional de Promoción Científica y Tecnológica, Argentina), PIP688 (Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina) and PPI 18/C456 (Universidad Nacional de Río Cuarto). The authors want to thank the comprehensive and fruitful reviews of Roberto Weinberg, Sebastián Oriolo and Ulrich Riller that strongly contributed to improve the manuscript. M. Demartis wants to thank Mr. Peter Stutz (Universität Hamburg) for laboratory assistance during a research stay.
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This work has been financially supported by the National Agency for Scientific and Technological Promotion (Agencia Nacional de Promoción Científica y Tecnológica, Argentina), the National Scientific and Technical Research Council (Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina) and the National University of Río Cuarto (Universidad Nacional de Río Cuarto, Argentina).
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Demartis, M., Jung, S., Hauff, F. et al. Shear-assisted water-fluxed melting and AFC processes in the foreland of the Early Paleozoic Famatinian orogen: petrogenesis of leucogranites and pegmatites from the Sierras de Córdoba, Argentina. Int J Earth Sci (Geol Rundsch) 110, 2495–2517 (2021). https://doi.org/10.1007/s00531-020-01961-2
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DOI: https://doi.org/10.1007/s00531-020-01961-2