Palaeoenvironmental evolution of the glacial-postglacial transition in the agua colorada formation (paganzo group), carboniferous, Sierra de Narváez, NW Argentina

The Carboniferous sequences (lower section of the Paganzo Group) outcroping in the central part of the Sierra de Narváez (Las Angosturas area, northwestern Argentina) are described in this paper. From the regional point of view, two major Carboniferous sequences have been identified. Firstly, diamic...

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Autores principales: Limarino, C.O., Spalletti, L.A., Piñol, F.C.
Formato: JOUR
Materias:
Argentina
Carboniferous
Glaciation
Palaeofjord
Sierra de Narváez
facies
fjord
glaciation
mudstone
paleoenvironment
Paleozoic
sandstone
sedimentation
sedimentology
shale
transgression
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_07187092_v37_n1_p121_Limarino
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_07187092_v37_n1_p121_Limarino
record_format dspace
spelling todo:paper_07187092_v37_n1_p121_Limarino2023-10-03T15:36:36Z Palaeoenvironmental evolution of the glacial-postglacial transition in the agua colorada formation (paganzo group), carboniferous, Sierra de Narváez, NW Argentina Limarino, C.O. Spalletti, L.A. Piñol, F.C. Argentina Carboniferous Glaciation Palaeofjord Sierra de Narváez Carboniferous facies fjord glaciation mudstone paleoenvironment Paleozoic sandstone sedimentation sedimentology shale transgression Argentina The Carboniferous sequences (lower section of the Paganzo Group) outcroping in the central part of the Sierra de Narváez (Las Angosturas area, northwestern Argentina) are described in this paper. From the regional point of view, two major Carboniferous sequences have been identified. Firstly, diamictites, conglomerates, sandstones, carbonaceous mudstones and thin coal beds that were included in the Agua Colorada Formation. A second group comprises monotonous sequences of shales and interstratified mudstones and sandstones which were excluded from the Agua Colorada Formation and identified with the informal name of 'Marine Late Paleozoic rocks'. Sedimentological characteristics of the Agua Colorada Formation allow recognizing seven facies associations in the Angosturas area: 1. monomictic diamictites; 2. polymictic diamictites and conglomerates; 3. shalesandstone cycles; 4. dark shales; 5. greenish monomictic conglomerates; 6. channelised polymictic conglomerates and 7. coarse-grained sandstones, shales and thin coal beds. Facies associations 1 and 2, including both massive and resedimented diamictites, are interpreted as related to the well known Namurian gondwanic glacial event in western basins of Argentina. Facies associations 3, 4 and 5 record the evolution of a fjord environment formed as a consequence of the postglacial transgression (the so-called Namurian postglacial transgression) that flooded glacial valleys in the major part of the Paganzo Basin. A regional relative sea level fall marked by a regional incision surface occurred at the base of facies association 6, and the fjord environment was sharply replaced by fluvial sedimentation (facies associations 6 and 7). A regional correlation model, based on the postglacial transgression key level, among the Sistema del Famatina, Precordillera and Sierras Pampeanas is proposed. © 2011 Servicio Nacional de Geología y Minería. Fil:Limarino, C.O. 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_07187092_v37_n1_p121_Limarino
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Argentina
Carboniferous
Glaciation
Palaeofjord
Sierra de Narváez
Carboniferous
facies
fjord
glaciation
mudstone
paleoenvironment
Paleozoic
sandstone
sedimentation
sedimentology
shale
transgression
Argentina
spellingShingle Argentina
Carboniferous
Glaciation
Palaeofjord
Sierra de Narváez
Carboniferous
facies
fjord
glaciation
mudstone
paleoenvironment
Paleozoic
sandstone
sedimentation
sedimentology
shale
transgression
Argentina
Limarino, C.O.
Spalletti, L.A.
Piñol, F.C.
Palaeoenvironmental evolution of the glacial-postglacial transition in the agua colorada formation (paganzo group), carboniferous, Sierra de Narváez, NW Argentina
topic_facet Argentina
Carboniferous
Glaciation
Palaeofjord
Sierra de Narváez
Carboniferous
facies
fjord
glaciation
mudstone
paleoenvironment
Paleozoic
sandstone
sedimentation
sedimentology
shale
transgression
Argentina
description The Carboniferous sequences (lower section of the Paganzo Group) outcroping in the central part of the Sierra de Narváez (Las Angosturas area, northwestern Argentina) are described in this paper. From the regional point of view, two major Carboniferous sequences have been identified. Firstly, diamictites, conglomerates, sandstones, carbonaceous mudstones and thin coal beds that were included in the Agua Colorada Formation. A second group comprises monotonous sequences of shales and interstratified mudstones and sandstones which were excluded from the Agua Colorada Formation and identified with the informal name of 'Marine Late Paleozoic rocks'. Sedimentological characteristics of the Agua Colorada Formation allow recognizing seven facies associations in the Angosturas area: 1. monomictic diamictites; 2. polymictic diamictites and conglomerates; 3. shalesandstone cycles; 4. dark shales; 5. greenish monomictic conglomerates; 6. channelised polymictic conglomerates and 7. coarse-grained sandstones, shales and thin coal beds. Facies associations 1 and 2, including both massive and resedimented diamictites, are interpreted as related to the well known Namurian gondwanic glacial event in western basins of Argentina. Facies associations 3, 4 and 5 record the evolution of a fjord environment formed as a consequence of the postglacial transgression (the so-called Namurian postglacial transgression) that flooded glacial valleys in the major part of the Paganzo Basin. A regional relative sea level fall marked by a regional incision surface occurred at the base of facies association 6, and the fjord environment was sharply replaced by fluvial sedimentation (facies associations 6 and 7). A regional correlation model, based on the postglacial transgression key level, among the Sistema del Famatina, Precordillera and Sierras Pampeanas is proposed. © 2011 Servicio Nacional de Geología y Minería.
format JOUR
author Limarino, C.O.
Spalletti, L.A.
Piñol, F.C.
author_facet Limarino, C.O.
Spalletti, L.A.
Piñol, F.C.
author_sort Limarino, C.O.
title Palaeoenvironmental evolution of the glacial-postglacial transition in the agua colorada formation (paganzo group), carboniferous, Sierra de Narváez, NW Argentina
title_short Palaeoenvironmental evolution of the glacial-postglacial transition in the agua colorada formation (paganzo group), carboniferous, Sierra de Narváez, NW Argentina
title_full Palaeoenvironmental evolution of the glacial-postglacial transition in the agua colorada formation (paganzo group), carboniferous, Sierra de Narváez, NW Argentina
title_fullStr Palaeoenvironmental evolution of the glacial-postglacial transition in the agua colorada formation (paganzo group), carboniferous, Sierra de Narváez, NW Argentina
title_full_unstemmed Palaeoenvironmental evolution of the glacial-postglacial transition in the agua colorada formation (paganzo group), carboniferous, Sierra de Narváez, NW Argentina
title_sort palaeoenvironmental evolution of the glacial-postglacial transition in the agua colorada formation (paganzo group), carboniferous, sierra de narváez, nw argentina
url http://hdl.handle.net/20.500.12110/paper_07187092_v37_n1_p121_Limarino
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AT spallettila palaeoenvironmentalevolutionoftheglacialpostglacialtransitionintheaguacoloradaformationpaganzogroupcarboniferoussierradenarvaeznwargentina
AT pinolfc palaeoenvironmentalevolutionoftheglacialpostglacialtransitionintheaguacoloradaformationpaganzogroupcarboniferoussierradenarvaeznwargentina
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