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Artículo

Geochronology and geochemistry of the tabaquito batholith (Frontal cordillera, argentina): Geodynamic implications and temporal correlations in the sw gondwana margin

Moreno Moreno, Juan AntonioIcon ; Dahlquist, Juan AndrésIcon ; Morales Camera, Matías MartínIcon ; Alasino, Pablo HoracioIcon ; Larrovere, Mariano AlexisIcon ; Basei, Miguel A. S.; Galindo, Carmen; Zandomeni, Priscila SoledadIcon ; Rocher, SebastianIcon
Fecha de publicación: 12/2019
Editorial: Geological Society Publications House
Revista: Journal of the Geological Society
ISSN: 0016-7649
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Geoquímica y Geofísica

Resumen

The Tabaquito batholith (Frontal Cordillera, western Argentina), is mainly composed of shallowly emplaced granodiorite to minor monzogranite with abundant mafic microgranular enclaves. New sensitive high-resolution ion microprobe U–Pb zircon ages of c. 337 Ma (biotite granodiorite) and c. 284 Ma (mafic dyke) along with previously published geochronological data suggest that a long-lived magmatic system formed through at least two magmatic pulses at c. 337 and c. 322 Ma with later superimposition of Permian magmatism. The Tabaquito granitoids are metaluminous, calc-alkalic and magnesian with I-type affinity. Elevated Th/Nb, Y/Nb and La/Nb ratios along with negative Nb–Ta and positive Pb anomalies are consistent with a continental arc setting. Hf, Nd and Sr isotopic composition of the Tabaquito granitoids suggests that their source could result from mixing of an old felsic crustal component and a juvenile mafic to intermediate component. New geochronological and geochemical data together with published data reveal a continuous arc setting from the Carboniferous to the Permian in Argentina, and important magmatic compositional variations through time and space controlled by episodic fluctuations in the subduction angle of the oceanic plate. Reported and compiled data allow us to infer the continuity of the Carboniferous magmatic arc along the west margin of Gondwana.
Palabras clave: FRONTAL CORDILLERA , PRE-ANDEAN MAGMATISM , CALC-ALKALINE I-TYPE GRANITOIDS , SUBDUCTION ANGLE , CARBONIFEROUS AND PERMIAN , SHALLOW EMPLACEMENT , INCREMENTAL GROWTH
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info:eu-repo/semantics/openAccess 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/11336/125658
URL: http://jgs.lyellcollection.org/lookup/doi/10.1144/jgs2019-062
DOI: http://dx.doi.org/10.1144/jgs2019-062
Colecciones
Articulos(CICTERRA)
Articulos de CENTRO DE INVEST.EN CS.DE LA TIERRA
Citación
Moreno Moreno, Juan Antonio; Dahlquist, Juan Andrés; Morales Camera, Matías Martín; Alasino, Pablo Horacio; Larrovere, Mariano Alexis; et al.; Geochronology and geochemistry of the tabaquito batholith (Frontal cordillera, argentina): Geodynamic implications and temporal correlations in the sw gondwana margin; Geological Society Publications House; Journal of the Geological Society; 177; 3; 12-2019; 455-474
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