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Abstract:

We have carried out zircon U-Pb SHRIMP dating and Hf isotope determinations as well as geochemical analyses on three plutonic units of Gondwanan magmatism that crop out in NW Argentina. Two episodes of different age and genesis have been identified. The older one includes gabbros and diorites (Río Grande Unit) of 267±3 Ma and granitoids (belonging to the Llullaillaco Unit) of 263±1 Ma (late Permian, Guadalupian); the parent magmas were generated in an intraplate environment and derived from an enriched mantle but were subsequently contaminated by crustal components. The younger rocks are granodiorites with arc signature (Chuculaqui Unit) and an age of 247±2 Ma (middle Triassic-Anisian). Hf isotope signature of the units indicates mantle sources as well as crustal components. Hf model ages obtained are consistent with the presence of crustal Mesoproterozoic (mainly Ectasian to Calymnian (TDM(c) =1.24 to 1.44 Ga-negative Hf(T)) and juvenile Cryogenian sources (TDM=0.65 to 0.79 Ga-positive εHf(T)), supporting the idea of a continuous, mostly Mesoproterozoic, basement under the Central Andes, as an extension of the Arequipa-Antofalla massif. The tectonic setting and age of the Gondwanan magmatism in NW Argentina allow to differentiate: a. Permian intra-plate magmatism developed under similar conditions to the upper section of the Choiyoi magmatism exposed in the Frontal Cordillera and San Rafael Block, Argentina; b. Triassic magmatism belonging to a poorly known subduction-related magmatic arc segment of mostly NS trend with evidence of porphyry type mineralization in Chile, allowing to extend this metallotect into Argentina.

Registro:

Documento: Artículo
Título:Geochemistry, U-Pb SHRIMP zircon dating and Hf isotopes of the Gondwanan magmatism in NW Argentina: Petrogenesis and geodynamic implications
Autor:Poma, S.; Zappettini, E.O.; Quenardelle, S.; Santos, J.O.; Koukharsky, M.; Belousova, E.; McNaughton, N.
Filiación:Institute de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA-CONICET), Universidad de Buenos Aires, Departamento de Ciencias Geológicas, Pabellón II-Ciudad Universitaria, Intendente Giiiraides 2160, C1428 EGA, Argentina
Servicio Geológico Minero Argentino (SEGEMAR), Avda. General Paz 5445, edificio 25, San Martín B1650WAB, Argentina
University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia
ARC National Key Centre for Geochemical Evolution and Metallogeny of Continents (GEMOC), Macquarie University, Sydney NSW 2109, Australia
Palabras clave:Geochemistry; Gondwanan magmatism; Lu-Hf isotope; NW Argentina; U-Pb SHRIMP dating; diorite; gabbro; geochemistry; geodynamics; Gondwana; granitoid; hafnium; isotopic analysis; lutetium; magmatism; mantle source; petrogenesis; SHRIMP dating; tectonic setting; uranium-lead dating; zircon; Andes; Argentina; Cordillera Frontal; Mendoza; San Rafael [Mendoza]; Anisia
Año:2014
Volumen:41
Número:2
Página de inicio:267
Página de fin:292
DOI: http://dx.doi.org/10.5027/andgeoV41n2-a01
Título revista:Andean Geology
Título revista abreviado:Andean Geol.
ISSN:07187092
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_07187092_v41_n2_p267_Poma

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Citas:

---------- APA ----------
Poma, S., Zappettini, E.O., Quenardelle, S., Santos, J.O., Koukharsky, M., Belousova, E. & McNaughton, N. (2014) . Geochemistry, U-Pb SHRIMP zircon dating and Hf isotopes of the Gondwanan magmatism in NW Argentina: Petrogenesis and geodynamic implications . Andean Geology, 41(2), 267-292.
http://dx.doi.org/10.5027/andgeoV41n2-a01
---------- CHICAGO ----------
Poma, S., Zappettini, E.O., Quenardelle, S., Santos, J.O., Koukharsky, M., Belousova, E., et al. "Geochemistry, U-Pb SHRIMP zircon dating and Hf isotopes of the Gondwanan magmatism in NW Argentina: Petrogenesis and geodynamic implications " . Andean Geology 41, no. 2 (2014) : 267-292.
http://dx.doi.org/10.5027/andgeoV41n2-a01
---------- MLA ----------
Poma, S., Zappettini, E.O., Quenardelle, S., Santos, J.O., Koukharsky, M., Belousova, E., et al. "Geochemistry, U-Pb SHRIMP zircon dating and Hf isotopes of the Gondwanan magmatism in NW Argentina: Petrogenesis and geodynamic implications " . Andean Geology, vol. 41, no. 2, 2014, pp. 267-292.
http://dx.doi.org/10.5027/andgeoV41n2-a01
---------- VANCOUVER ----------
Poma, S., Zappettini, E.O., Quenardelle, S., Santos, J.O., Koukharsky, M., Belousova, E., et al. Geochemistry, U-Pb SHRIMP zircon dating and Hf isotopes of the Gondwanan magmatism in NW Argentina: Petrogenesis and geodynamic implications . Andean Geol. 2014;41(2):267-292.
http://dx.doi.org/10.5027/andgeoV41n2-a01