@article{10272/27806,
year = {2026},
url = {https://hdl.handle.net/10272/27806},
abstract = {The El Fierro pluton represents one of the late-stage plutons of the Choiyoi Magmatic Province in the Colangüil batholith (Frontal Cordillera, Argentina). New U‑Pb zircon dating yields a crystallisation age of 262 ± 2 Ma, with
zircon antecrysts (~273 Ma) indicating prolonged magmatic activity that overlaps with the early-stage Choiyoi Itype magmatism (ca. 270–290 Ma). This pluton is ferroan, alkali-calcic to calc-alkalic, and essentially weakly
peraluminous (av. 1.05 ± 0.06), exhibiting high Ga/Al ratios, elevated HFSE concentrations (Ce + Zr + Nb + Y; av. 310 ± 147 ppm; range: 150–584 ppm), extreme F enrichment (6101–31,442 ppm) and relatively high zircon-saturation (775 ± 45 ◦C) and apatite-saturation temperatures (887 ± 78 ◦C), consistent with an A-type affinity. Isotope data (εHft = 􀀀 7.0 to +1.25; εNdi ≈ 􀀀 3), together with geochemical compositions, reflect a hybrid crustal source involving metasedimentary components likely metasomatized by mantle fluids. Accordingly, we interpret the El Fierro pluton as the product of crustal melting during lithospheric thinning and slab retreat, marking the onset of incipient rifting in southwestern Gondwana. This study highlights that A-type granites can be generated in extensional regimes within arc settings.},
organization = {The authors acknowledge financial support from: Consejo Nacional de Investigaciones Científicas y Técnicas CONICET [PIP0564], Fondo para la Investigación Científica y Tecnológica FONCyT [PICT 2020 0378 and PICT 2018 1899], Consolidar 2023 SECyT-UNC, and FAPESP [2018/06837-3] linked to Thematic Project FAPESP [2015/03737-0]. Funding for open access charge: Universidad de Huelva / CBUA. We sincerely appreciate the thorough revisions provided by Michael Roden and an anonymous reviewer, which clearly improved the final version of our work. We also thank Editor-in-Chief Astrid Holzheid and the handling editor for their efficient and helpful editorial management.},
keywords = {High F A-type granites},
keywords = {High F A-type granites Choiyoi Magmatic Province},
keywords = {Granite petrogenesis},
keywords = {Metasomatized continental crust},
keywords = {Extensional arc regime},
title = {Unravelling the origin of A-type granites in an extensional arc setting: Insights from the Permian El Fierro pluton, Colangüil batholith (Frontal Cordillera, Argentina)},
doi = {10.1016/j.chemer.2026.126388},
author = {Moreno Moreno, Juan Antonio and Santos da Cruz, Gilmara and Dahlquist, Juan Andrés and Morales Cámera, Matías M. and Zandomeni, Priscila Soledad and Gonzalez-Liedtke, Gabriela A. and Basei, Miguel A.S. and Verma, Sanjeet Kumar},
}