High frequency subtidal-peritidal cycles of the Callovian Calabozo Formation (Neuquén Basin, Western Argentina): Preliminary approach

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The Calabozo Formation (Cuyo Mesosequence, Neuquén Basin) is made up by a thin, up to 30-m thick Middle Jurassic carbonate-dominated sequence. The minor, thin siliciclastic facies in this formation (i.e. lowermost granule-pebble shoreface conglomerate and fine-grained sandstones interbedded among th...

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Autores principales: Palma, R.M., Lo Forte, G.L., Medhli, M., Piethé, R.D.
Formato: JOUR
Materias:
Carbonate facies and microfacies
Jurassic
Subtidal-Peritidal Cyclicity
facies analysis
Argentina
Neuquen Basin
South America
Western Hemisphere
World
algae
Anthozoa
Chlorophyta
Cyanobacteria
Cylindroporella
uncultured cyanobacterium
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_16956133_v3_n2_p119_Palma
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_16956133_v3_n2_p119_Palma2023-10-03T16:29:58Z High frequency subtidal-peritidal cycles of the Callovian Calabozo Formation (Neuquén Basin, Western Argentina): Preliminary approach Palma, R.M. Lo Forte, G.L. Medhli, M. Piethé, R.D. Carbonate facies and microfacies Jurassic Subtidal-Peritidal Cyclicity facies analysis Argentina Neuquen Basin South America Western Hemisphere World algae Anthozoa Chlorophyta Cyanobacteria Cylindroporella uncultured cyanobacterium The Calabozo Formation (Cuyo Mesosequence, Neuquén Basin) is made up by a thin, up to 30-m thick Middle Jurassic carbonate-dominated sequence. The minor, thin siliciclastic facies in this formation (i.e. lowermost granule-pebble shoreface conglomerate and fine-grained sandstones interbedded among the lower carbonates) record early transgressive shoreline and shallow lagoonal-subtidal sedimentation, respectively. The major carbonate deposits have been split into six facies and seven microfacies on the base of macroscopic field observation and petrological analysis. The carbonate facies have been grouped into three major assemblages: 1) Tidal flat facies assemblage (including the planar laminated algal boundstone facies; 2) Inner platform facies assemblage (including peloidal and bioclastic wackestone, coral floatstone and bioclastic and intraclastic packstone facies; and 3) Platform margin assemblage (including oolitic-peloidal packstone-grainstone facies). A fossil algal record made up by dasycladacean species (Salpingoporella annulata, Cylindroporella sp. and Heteroporella sp.) and blue-green algae (Cayeuxia (Rivularia) piae, and Cayeuxia (Rivularia) kurdistanensis) has been reported for the first time in this unit. The analysis of the intracycle facies and microfacies arrangements, as well as the nature of the cycle bounding surfaces, enabled one to identify two kinds of cycles. 1) Widespread subtidal cycles capped by shallow to intermediate subtidal facies, with no evidence of subaerial exposure at cycle tops; and 2) a minor subtidal cycle with similar shallowing-upward trend but capped by peritidal facies. The stacking pattern and thickness trend of these cycles was studied to determine possible allocyclic and autocyclic controls on their evolution. The Fischer plots reveal that the deposition of the Calabozo Formation subtidal-peritidal cycles took place under upward decreasing accommodation space conditions which may be related to eustatic lowering. © UB-ICTJA. Fil:Palma, R.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lo Forte, G.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Piethé, R.D. 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_16956133_v3_n2_p119_Palma
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Carbonate facies and microfacies
Jurassic
Subtidal-Peritidal Cyclicity
facies analysis
Argentina
Neuquen Basin
South America
Western Hemisphere
World
algae
Anthozoa
Chlorophyta
Cyanobacteria
Cylindroporella
uncultured cyanobacterium
spellingShingle Carbonate facies and microfacies
Jurassic
Subtidal-Peritidal Cyclicity
facies analysis
Argentina
Neuquen Basin
South America
Western Hemisphere
World
algae
Anthozoa
Chlorophyta
Cyanobacteria
Cylindroporella
uncultured cyanobacterium
Palma, R.M.
Lo Forte, G.L.
Medhli, M.
Piethé, R.D.
High frequency subtidal-peritidal cycles of the Callovian Calabozo Formation (Neuquén Basin, Western Argentina): Preliminary approach
topic_facet Carbonate facies and microfacies
Jurassic
Subtidal-Peritidal Cyclicity
facies analysis
Argentina
Neuquen Basin
South America
Western Hemisphere
World
algae
Anthozoa
Chlorophyta
Cyanobacteria
Cylindroporella
uncultured cyanobacterium
description The Calabozo Formation (Cuyo Mesosequence, Neuquén Basin) is made up by a thin, up to 30-m thick Middle Jurassic carbonate-dominated sequence. The minor, thin siliciclastic facies in this formation (i.e. lowermost granule-pebble shoreface conglomerate and fine-grained sandstones interbedded among the lower carbonates) record early transgressive shoreline and shallow lagoonal-subtidal sedimentation, respectively. The major carbonate deposits have been split into six facies and seven microfacies on the base of macroscopic field observation and petrological analysis. The carbonate facies have been grouped into three major assemblages: 1) Tidal flat facies assemblage (including the planar laminated algal boundstone facies; 2) Inner platform facies assemblage (including peloidal and bioclastic wackestone, coral floatstone and bioclastic and intraclastic packstone facies; and 3) Platform margin assemblage (including oolitic-peloidal packstone-grainstone facies). A fossil algal record made up by dasycladacean species (Salpingoporella annulata, Cylindroporella sp. and Heteroporella sp.) and blue-green algae (Cayeuxia (Rivularia) piae, and Cayeuxia (Rivularia) kurdistanensis) has been reported for the first time in this unit. The analysis of the intracycle facies and microfacies arrangements, as well as the nature of the cycle bounding surfaces, enabled one to identify two kinds of cycles. 1) Widespread subtidal cycles capped by shallow to intermediate subtidal facies, with no evidence of subaerial exposure at cycle tops; and 2) a minor subtidal cycle with similar shallowing-upward trend but capped by peritidal facies. The stacking pattern and thickness trend of these cycles was studied to determine possible allocyclic and autocyclic controls on their evolution. The Fischer plots reveal that the deposition of the Calabozo Formation subtidal-peritidal cycles took place under upward decreasing accommodation space conditions which may be related to eustatic lowering. © UB-ICTJA.
format JOUR
author Palma, R.M.
Lo Forte, G.L.
Medhli, M.
Piethé, R.D.
author_facet Palma, R.M.
Lo Forte, G.L.
Medhli, M.
Piethé, R.D.
author_sort Palma, R.M.
title High frequency subtidal-peritidal cycles of the Callovian Calabozo Formation (Neuquén Basin, Western Argentina): Preliminary approach
title_short High frequency subtidal-peritidal cycles of the Callovian Calabozo Formation (Neuquén Basin, Western Argentina): Preliminary approach
title_full High frequency subtidal-peritidal cycles of the Callovian Calabozo Formation (Neuquén Basin, Western Argentina): Preliminary approach
title_fullStr High frequency subtidal-peritidal cycles of the Callovian Calabozo Formation (Neuquén Basin, Western Argentina): Preliminary approach
title_full_unstemmed High frequency subtidal-peritidal cycles of the Callovian Calabozo Formation (Neuquén Basin, Western Argentina): Preliminary approach
title_sort high frequency subtidal-peritidal cycles of the callovian calabozo formation (neuquén basin, western argentina): preliminary approach
url http://hdl.handle.net/20.500.12110/paper_16956133_v3_n2_p119_Palma
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