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Artículo

Famatinian magmatism in the SW Gondwana margin: A review focused on the Sierras Pampeanas (Argentina)

Alasino, Pablo HoracioIcon ; Larrovere, Mariano AlexisIcon ; Ratschbacher, B. C.; Casquet, César; Paterson, Scott Robert; Cafieri, JoaquínIcon
Fecha de publicación: 10/2024
Editorial: Pergamon-Elsevier Science Ltd
Revista: Journal of South American Earth Sciences
ISSN: 0895-9811
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Geología

Resumen

The Famatinian orogeny along proto-Pacific margin of Gondwana, from Venezuela to northeastern Patagonia, was of the accretional type during the Paleozoic (Ordovician to early Devonian). Information gathered from the Sierras Pampeanas (Argentina) reveals magmatism (plutonism and volcanism) between 490–465 Ma, with a peak at 473–467 Ma, similar to other regions along the margin. Metamorphic events in the middle crust occurred between 484 and 465 Ma, and at ca. 440 Ma. Recent reviews propose a lithospheric extension phase (>480 Ma) before contraction episodes (ca. 470 and 440 Ma). Magmatism transitioned from peraluminous to metaluminous intrusions, with prolonged mafic magmatism throughout. Mafic intrusions show a broad spectrum of isotope compositions (87Sr/86Srt = 0.705 to 0.711 and ƐNdt = +5 to –6) but with general trends toward isotopically enriched magmas. The main arc involved tonalite-granodiorite magmas (ca. 480–470 Ma) with <25% crustal contamination but crustal-like isotopic signatures (87Sr/86Srt = 0.707 to 0.711 and ƐNdt = –4 to –6). The wide isotopic variations in granodiorite-monzogranite (and volcanic equivalents) (87Sr/86Srt = 0.705 to 0.711 and ƐNdt = +3 to –6) suggest two origins: differentiation and contamination of tonalite-granodiorite magmas (AFC model) for the most evolved, and differentiation of juvenile mafic additions for the isotopically juvenile ones. Regardless of depth (~1 to 6 kbar) and position within the magmatic arc, analyzed areas display north-south striking and steep magmatic fabrics. These fabrics may have rotated by no more than 20-28°. The petrogenetic model involves isotopically diverse sub-arc mantle sources. Famatinian magmatism ceased abruptly around 465 Ma (magmatic lull), correlating with arcs along the SW Gondwana margin, indicating significant geodynamic changes in the subduction regime.
Palabras clave: FAMATINIAN , GONDWANA , PAMPEANAS , ORDOVICIAN
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/257108
DOI: http://dx.doi.org/10.1016/j.jsames.2024.105035
URL: https://www.sciencedirect.com/science/article/abs/pii/S0895981124002578
Colecciones
Articulos(CRILAR)
Articulos de CENTRO REGIONAL DE INV. CIENTIFICAS Y TRANSFERENCIA TECNOLOGICA DE ANILLACO
Citación
Alasino, Pablo Horacio; Larrovere, Mariano Alexis; Ratschbacher, B. C.; Casquet, César; Paterson, Scott Robert; et al.; Famatinian magmatism in the SW Gondwana margin: A review focused on the Sierras Pampeanas (Argentina); Pergamon-Elsevier Science Ltd; Journal of South American Earth Sciences; 145; 10-2024; 1-18; 105035
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