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)

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 accord...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Remesal, M., Fauqué, L.A., Limarino, C.O.
Formato: JOUR
Materias:
Late Paleozoic
Orogenic volcanism
Precordillera
Carboniferous
lava flow
magma chemistry
mantle source
Permian
pyroclastic flow
subduction zone
volcanism
Argentina
La Rioja [Argentina]
South America
Western Hemisphere
World
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v59_n3_p462_Remesal
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00044822_v59_n3_p462_Remesal
record_format dspace
spelling todo:paper_00044822_v59_n3_p462_Remesal2023-10-03T13:57:57Z 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) Remesal, M. Fauqué, L.A. Limarino, C.O. 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 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v59_n3_p462_Remesal
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
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)
topic_facet 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
description 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.
format JOUR
author Remesal, M.
Fauqué, L.A.
Limarino, C.O.
author_facet Remesal, M.
Fauqué, L.A.
Limarino, C.O.
author_sort Remesal, M.
title 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)
title_short 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)
title_full 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)
title_fullStr 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)
title_full_unstemmed 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)
title_sort 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)
url http://hdl.handle.net/20.500.12110/paper_00044822_v59_n3_p462_Remesal
work_keys_str_mv AT remesalm latepalaeozoiccalcalkalinevolcanismintheprecordilleraoflariojapetrologyandlithostratigraphicalcharacterizationofthepuntadelaguaformationlatecarboniferousearlypermian
AT fauquela latepalaeozoiccalcalkalinevolcanismintheprecordilleraoflariojapetrologyandlithostratigraphicalcharacterizationofthepuntadelaguaformationlatecarboniferousearlypermian
AT limarinoco latepalaeozoiccalcalkalinevolcanismintheprecordilleraoflariojapetrologyandlithostratigraphicalcharacterizationofthepuntadelaguaformationlatecarboniferousearlypermian
_version_ 1807320702145003520

Ejemplares similares