Clay mineralogy and calcareous nannofossils from Jagüel and Roca formations in the eastern sector of Pellegrini Lake, Neuquen BASIN, República Argentina

This study presents new mineralogical, sedimentologi-cal, and micropaleontological data from the Jagüel (Late Maastrichtian-Early Danian) and Roca (Danian) formations, located in the eastern sector of Pellegrini Lake, Río Negro province, República Argentina. According to the physical characteristics...

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Autores principales: Musso, T., Concheyro, A., Pettinari, G.
Formato: JOUR
Materias:
Argentina
Calcareous nannofossils
Clay minerals
Cretaceous
Neuquen basin
Paleocene
clay mineral
Danian
kaolinite
lithofacies
lithostratigraphy
Maastrichtian
micropaleontology
mudstone
nanofossil
sedimentology
volcanism
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_07187092_v39_n3_p511_Musso
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_07187092_v39_n3_p511_Musso
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spelling todo:paper_07187092_v39_n3_p511_Musso2023-10-03T15:36:40Z Clay mineralogy and calcareous nannofossils from Jagüel and Roca formations in the eastern sector of Pellegrini Lake, Neuquen BASIN, República Argentina Musso, T. Concheyro, A. Pettinari, G. Argentina Calcareous nannofossils Clay minerals Cretaceous Neuquen basin Paleocene clay mineral Danian kaolinite lithofacies lithostratigraphy Maastrichtian micropaleontology mudstone nanofossil sedimentology volcanism Argentina This study presents new mineralogical, sedimentologi-cal, and micropaleontological data from the Jagüel (Late Maastrichtian-Early Danian) and Roca (Danian) formations, located in the eastern sector of Pellegrini Lake, Río Negro province, República Argentina. According to the physical characteristics and the age of the sediments that conform these formations, two siliciclastic lithofacies and a carbonate one were recognized, they are named: Maastrichtian grayish yellow calcareous mudstones, Danian olive gray calcareous mudstones, and Danian carbonates. The rocks which constitutes siliciclastic lithofacies were classified as allochemical mudstones and the mineralogy is characterized by high proportions of clay minerals and, to a lesser extent, calcite. The clay mineral association is dominated by a random (R0) I/S mixed-layers (70-90% Sm) accompanied by lower proportions of illite and kaolinite. The mineralogy and the microfabric of the mudstones reflect that these sediments have not been affected significantly by diagenesis. Clay minerals would be of detrital origin and the predominance of the highly smectitic I/S along all sections would be associated with an active volcanism coming from the western magmatic arc, located in the Neuquén Basin during the Late Cretaceous and Paleocene. Micropalaeontological analyses confirmed the presence of Cretaceous-Paleogene transition in the Jagüel Formation beds. The calcareous nannofossils allowed to relate changes in the the mineralogical associations along the K/P transition. In this way, it was possible to detect an increase in kaolinite content close to the K/P boundary (>10%), that decreases towards higher positions of the Danian, which could indicate a warmer and wetter climate during this interval, that it would tend to be drier with seasonal conditions in the late Danian. The Maastrichtian calcareous nannofossil assemblages suggest oligotrophic environments and a well stratified photic zone, nevertheless, in some horizons, the nannoflora is abundant with lower richness which would indicate more restricted marine conditions. Fil:Concheyro, A. 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_v39_n3_p511_Musso
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
Calcareous nannofossils
Clay minerals
Cretaceous
Neuquen basin
Paleocene
clay mineral
Danian
kaolinite
lithofacies
lithostratigraphy
Maastrichtian
micropaleontology
mudstone
nanofossil
sedimentology
volcanism
Argentina
spellingShingle Argentina
Calcareous nannofossils
Clay minerals
Cretaceous
Neuquen basin
Paleocene
clay mineral
Danian
kaolinite
lithofacies
lithostratigraphy
Maastrichtian
micropaleontology
mudstone
nanofossil
sedimentology
volcanism
Argentina
Musso, T.
Concheyro, A.
Pettinari, G.
Clay mineralogy and calcareous nannofossils from Jagüel and Roca formations in the eastern sector of Pellegrini Lake, Neuquen BASIN, República Argentina
topic_facet Argentina
Calcareous nannofossils
Clay minerals
Cretaceous
Neuquen basin
Paleocene
clay mineral
Danian
kaolinite
lithofacies
lithostratigraphy
Maastrichtian
micropaleontology
mudstone
nanofossil
sedimentology
volcanism
Argentina
description This study presents new mineralogical, sedimentologi-cal, and micropaleontological data from the Jagüel (Late Maastrichtian-Early Danian) and Roca (Danian) formations, located in the eastern sector of Pellegrini Lake, Río Negro province, República Argentina. According to the physical characteristics and the age of the sediments that conform these formations, two siliciclastic lithofacies and a carbonate one were recognized, they are named: Maastrichtian grayish yellow calcareous mudstones, Danian olive gray calcareous mudstones, and Danian carbonates. The rocks which constitutes siliciclastic lithofacies were classified as allochemical mudstones and the mineralogy is characterized by high proportions of clay minerals and, to a lesser extent, calcite. The clay mineral association is dominated by a random (R0) I/S mixed-layers (70-90% Sm) accompanied by lower proportions of illite and kaolinite. The mineralogy and the microfabric of the mudstones reflect that these sediments have not been affected significantly by diagenesis. Clay minerals would be of detrital origin and the predominance of the highly smectitic I/S along all sections would be associated with an active volcanism coming from the western magmatic arc, located in the Neuquén Basin during the Late Cretaceous and Paleocene. Micropalaeontological analyses confirmed the presence of Cretaceous-Paleogene transition in the Jagüel Formation beds. The calcareous nannofossils allowed to relate changes in the the mineralogical associations along the K/P transition. In this way, it was possible to detect an increase in kaolinite content close to the K/P boundary (>10%), that decreases towards higher positions of the Danian, which could indicate a warmer and wetter climate during this interval, that it would tend to be drier with seasonal conditions in the late Danian. The Maastrichtian calcareous nannofossil assemblages suggest oligotrophic environments and a well stratified photic zone, nevertheless, in some horizons, the nannoflora is abundant with lower richness which would indicate more restricted marine conditions.
format JOUR
author Musso, T.
Concheyro, A.
Pettinari, G.
author_facet Musso, T.
Concheyro, A.
Pettinari, G.
author_sort Musso, T.
title Clay mineralogy and calcareous nannofossils from Jagüel and Roca formations in the eastern sector of Pellegrini Lake, Neuquen BASIN, República Argentina
title_short Clay mineralogy and calcareous nannofossils from Jagüel and Roca formations in the eastern sector of Pellegrini Lake, Neuquen BASIN, República Argentina
title_full Clay mineralogy and calcareous nannofossils from Jagüel and Roca formations in the eastern sector of Pellegrini Lake, Neuquen BASIN, República Argentina
title_fullStr Clay mineralogy and calcareous nannofossils from Jagüel and Roca formations in the eastern sector of Pellegrini Lake, Neuquen BASIN, República Argentina
title_full_unstemmed Clay mineralogy and calcareous nannofossils from Jagüel and Roca formations in the eastern sector of Pellegrini Lake, Neuquen BASIN, República Argentina
title_sort clay mineralogy and calcareous nannofossils from jagüel and roca formations in the eastern sector of pellegrini lake, neuquen basin, república argentina
url http://hdl.handle.net/20.500.12110/paper_07187092_v39_n3_p511_Musso
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AT concheyroa claymineralogyandcalcareousnannofossilsfromjaguelandrocaformationsintheeasternsectorofpellegrinilakeneuquenbasinrepublicaargentina
AT pettinarig claymineralogyandcalcareousnannofossilsfromjaguelandrocaformationsintheeasternsectorofpellegrinilakeneuquenbasinrepublicaargentina
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