RT Journal Article
T1 Unravelling the origin of A-type granites in an extensional arc setting: Insights from the Permian El Fierro pluton, Colangüil batholith (Frontal Cordillera, Argentina)
A1 Moreno Moreno, Juan Antonio
A1 Santos da Cruz, Gilmara
A1 Dahlquist, Juan Andrés
A1 Morales Cámera, Matías M.
A1 Zandomeni, Priscila Soledad
A1 Gonzalez-Liedtke, Gabriela A.
A1 Basei, Miguel A.S.
A1 Verma, Sanjeet Kumar
K1 High F A-type granites
K1 High F A-type granites Choiyoi Magmatic Province
K1 Granite petrogenesis
K1 Metasomatized continental crust
K1 Extensional arc regime
AB 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, withzircon 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 weaklyperaluminous (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.
YR 2026
FD 2026
LK https://hdl.handle.net/10272/27806
UL https://hdl.handle.net/10272/27806
LA eng
NO Moreno, J.A., Santos da Cruz, G., Dahlquist, J.A., Morales Cámera, M.M., Zandomeni, P.S., Gonzalez-Liedtke, G.A., Basei, M.A.S., Verma, S.K., 2026. Unravelling the origin of A-type granites in an extensional arc setting: Insights from the Permian El Fierro pluton, Colangüil batholith (Frontal Cordillera, Argentina). Geochemistry 86, 126388. https://doi.org/10.1016/j.chemer.2026.126388
NO 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.
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026