Sandstone composition changes and paleocurrent reversal in the Upper Paleozoic and Triassic deposits of the Huaco area, western Paganzo Basin, west-central Argentina

Sandstone detrital modes and paleocurrents in the Upper Paleozoic and Triassic deposits exposed near Huaco on the western sector of the Paganzo basin, western Argentina, reveal two distinctive petrofacies. A quartzofeldspathic petrofacies represented in the lacustrine and fluvial deposits of Carboni...

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Autores principales: Lopez Gamundi, O., Espejo, I.S., Alonso, M.S.
Formato: JOUR
Materias:
Carboniferous
compositional analysis
palaeocurrent
provenance
Triassic
Upper Palaeozoic
Argentina, Paganzo Basin, Huaco
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00370738_v66_n1-2_p99_LopezGamundi
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00370738_v66_n1-2_p99_LopezGamundi
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spelling todo:paper_00370738_v66_n1-2_p99_LopezGamundi2023-10-03T14:48:06Z Sandstone composition changes and paleocurrent reversal in the Upper Paleozoic and Triassic deposits of the Huaco area, western Paganzo Basin, west-central Argentina Lopez Gamundi, O. Espejo, I.S. Alonso, M.S. Carboniferous compositional analysis palaeocurrent provenance Triassic Upper Palaeozoic Argentina, Paganzo Basin, Huaco Sandstone detrital modes and paleocurrents in the Upper Paleozoic and Triassic deposits exposed near Huaco on the western sector of the Paganzo basin, western Argentina, reveal two distinctive petrofacies. A quartzofeldspathic petrofacies represented in the lacustrine and fluvial deposits of Carboniferous and early Permian age (Guandacol, Tupe and lower Patquía Formations) is characterized by a high content of monocrystalline quartz, low lithic content and high K-feldspar to total feldspar ratios. The fluvial facies of the lower Patquía grade vertically into eolian sandstones (upper Patquía Formation) which show a significant content of volcanic lithic fragments along with high proportions of monocrystalline quartz. This eolian succession is overlain by a volcaniclastic (lithofeldspathic) petrofacies represented by alluvial-fan and fluvial deposits of the late Permian to Triassic age (Cerro Morado and Cauquenes Formations). These sandstones are characteristic by high proportions of volcanic lithic fragments, plagioclase grains, low content of monocrystalline quartz and low K-feldspar to total feldspar ratios. This change in sandstone composition is accompanied by a reversal in paleocurrent patterns. The quartzofeldspathic petrofacies present in the Carboniferous and Lower Permian deposits show a general paleocurrent pattern from east to west with inferred cratonic provenances of plutonic and metamorphic composition. The volcaniclastic deposits indicate paleocurrents from west to east suggesting source areas associated with the magmatic arc developed on the Paleo-Pacific Gondwana margin during Permian and Triassic times. © 1990. Fil:Lopez Gamundi, O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Espejo, I.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Alonso, M.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00370738_v66_n1-2_p99_LopezGamundi
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Carboniferous
compositional analysis
palaeocurrent
provenance
Triassic
Upper Palaeozoic
Argentina, Paganzo Basin, Huaco
spellingShingle Carboniferous
compositional analysis
palaeocurrent
provenance
Triassic
Upper Palaeozoic
Argentina, Paganzo Basin, Huaco
Lopez Gamundi, O.
Espejo, I.S.
Alonso, M.S.
Sandstone composition changes and paleocurrent reversal in the Upper Paleozoic and Triassic deposits of the Huaco area, western Paganzo Basin, west-central Argentina
topic_facet Carboniferous
compositional analysis
palaeocurrent
provenance
Triassic
Upper Palaeozoic
Argentina, Paganzo Basin, Huaco
description Sandstone detrital modes and paleocurrents in the Upper Paleozoic and Triassic deposits exposed near Huaco on the western sector of the Paganzo basin, western Argentina, reveal two distinctive petrofacies. A quartzofeldspathic petrofacies represented in the lacustrine and fluvial deposits of Carboniferous and early Permian age (Guandacol, Tupe and lower Patquía Formations) is characterized by a high content of monocrystalline quartz, low lithic content and high K-feldspar to total feldspar ratios. The fluvial facies of the lower Patquía grade vertically into eolian sandstones (upper Patquía Formation) which show a significant content of volcanic lithic fragments along with high proportions of monocrystalline quartz. This eolian succession is overlain by a volcaniclastic (lithofeldspathic) petrofacies represented by alluvial-fan and fluvial deposits of the late Permian to Triassic age (Cerro Morado and Cauquenes Formations). These sandstones are characteristic by high proportions of volcanic lithic fragments, plagioclase grains, low content of monocrystalline quartz and low K-feldspar to total feldspar ratios. This change in sandstone composition is accompanied by a reversal in paleocurrent patterns. The quartzofeldspathic petrofacies present in the Carboniferous and Lower Permian deposits show a general paleocurrent pattern from east to west with inferred cratonic provenances of plutonic and metamorphic composition. The volcaniclastic deposits indicate paleocurrents from west to east suggesting source areas associated with the magmatic arc developed on the Paleo-Pacific Gondwana margin during Permian and Triassic times. © 1990.
format JOUR
author Lopez Gamundi, O.
Espejo, I.S.
Alonso, M.S.
author_facet Lopez Gamundi, O.
Espejo, I.S.
Alonso, M.S.
author_sort Lopez Gamundi, O.
title Sandstone composition changes and paleocurrent reversal in the Upper Paleozoic and Triassic deposits of the Huaco area, western Paganzo Basin, west-central Argentina
title_short Sandstone composition changes and paleocurrent reversal in the Upper Paleozoic and Triassic deposits of the Huaco area, western Paganzo Basin, west-central Argentina
title_full Sandstone composition changes and paleocurrent reversal in the Upper Paleozoic and Triassic deposits of the Huaco area, western Paganzo Basin, west-central Argentina
title_fullStr Sandstone composition changes and paleocurrent reversal in the Upper Paleozoic and Triassic deposits of the Huaco area, western Paganzo Basin, west-central Argentina
title_full_unstemmed Sandstone composition changes and paleocurrent reversal in the Upper Paleozoic and Triassic deposits of the Huaco area, western Paganzo Basin, west-central Argentina
title_sort sandstone composition changes and paleocurrent reversal in the upper paleozoic and triassic deposits of the huaco area, western paganzo basin, west-central argentina
url http://hdl.handle.net/20.500.12110/paper_00370738_v66_n1-2_p99_LopezGamundi
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