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Abstract:

The Punta del Agua Formation (northwest Paganzo Basin) represents the earliest manifestation of Neopalaeozoic volcanism in the Precordillera and Sierras Pampeanas. The unit consists of interbedded lava flows, pyroclastic flows and clastic sedimentary deposits. The lava flows have been divided according to their composition and textural characteristics; a dacitic sill is also included. Pyroclastic flows consist of block- and ashflow deposits and reoignimbrites. Between periods of volcanicity, conglomerates, lithic sandstones and scarce mudstones were deposited in lenticular bodies that reflect the irregular morphology of the volcanic area. Twelve samples of the volcanic rocks, obtained from both flanks of the Punta del Agua syncline were geochemically analysed. The variation in chemical composition ranges from basaltic andesites to rhyolites, but andesitic compositions dominate. The calc-alkaline character of these rocks and the abundance of K in the andesites, suggest that these magmas originated by subduction with crystal fractionation and contamination processes. The age of the Punta del Agua Formation was established on the basis of its stratigraphical relations and radiometric dating. Both suggest a Late Carboniferous age, although an Early Permian age for the uppermost part of the sequence cannot be disregarded. © 2004 Asociación Geológica Argentina.

Registro:

Documento: Artículo
Título:Late Palaeozoic calc-alkaline volcanism in the Precordillera of La Rioja: Petrology and lithostratigraphical characterization of the Punta del Agua Formation (Late Carboniferous - Early Permian)
Autor:Remesal, M.; Fauqué, L.A.; Limarino, C.O.
Filiación:Departamento de Cie. Geologicas, Facultad de Cie. Exactas y Naturales, Pabellón II, 1428 Buenos Aires, Argentina
Consejo Nac. Invest. Cie. Tec., Buenos Aires, Argentina
Serv. Geologico Minero Argentino, Buenos Aires, Argentina
Palabras clave:Late Paleozoic; Orogenic volcanism; Precordillera; Carboniferous; lava flow; magma chemistry; mantle source; Permian; pyroclastic flow; subduction zone; volcanism; Argentina; La Rioja [Argentina]; Precordillera; South America; Western Hemisphere; World
Año:2004
Volumen:59
Número:3
Página de inicio:462
Página de fin:476
Título revista:Revista de la Asociacion Geologica Argentina
Título revista abreviado:Rev. Asoc. Geol. Argent.
ISSN:00044822
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v59_n3_p462_Remesal

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Citas:

---------- APA ----------
Remesal, M., Fauqué, L.A. & Limarino, C.O. (2004) . Late Palaeozoic calc-alkaline volcanism in the Precordillera of La Rioja: Petrology and lithostratigraphical characterization of the Punta del Agua Formation (Late Carboniferous - Early Permian) . Revista de la Asociacion Geologica Argentina, 59(3), 462-476.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v59_n3_p462_Remesal [ ]
---------- CHICAGO ----------
Remesal, M., Fauqué, L.A., Limarino, C.O. "Late Palaeozoic calc-alkaline volcanism in the Precordillera of La Rioja: Petrology and lithostratigraphical characterization of the Punta del Agua Formation (Late Carboniferous - Early Permian) " . Revista de la Asociacion Geologica Argentina 59, no. 3 (2004) : 462-476.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v59_n3_p462_Remesal [ ]
---------- MLA ----------
Remesal, M., Fauqué, L.A., Limarino, C.O. "Late Palaeozoic calc-alkaline volcanism in the Precordillera of La Rioja: Petrology and lithostratigraphical characterization of the Punta del Agua Formation (Late Carboniferous - Early Permian) " . Revista de la Asociacion Geologica Argentina, vol. 59, no. 3, 2004, pp. 462-476.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v59_n3_p462_Remesal [ ]
---------- VANCOUVER ----------
Remesal, M., Fauqué, L.A., Limarino, C.O. Late Palaeozoic calc-alkaline volcanism in the Precordillera of La Rioja: Petrology and lithostratigraphical characterization of the Punta del Agua Formation (Late Carboniferous - Early Permian) . Rev. Asoc. Geol. Argent. 2004;59(3):462-476.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v59_n3_p462_Remesal [ ]