High frequency subtidal-peritidal cycles of the Callovian Calabozo Formation (Neuquén Basin, Western Argentina): Preliminary approach
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Universitat de Barcelona
2005
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| author | R.M. Palma |
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| contents | High frequency subtidal-peritidal cycles of the Callovian Calabozo Formation (Neuquén Basin, Western Argentina): Preliminary approach R.M. Palma M. Medhli R.D. Piethé G.L. Lo Forte Ciencias de la Tierra Subtidal Jurassic Peritidal Cyclicity Carbonate facies and microfacies The Calabozo Formation (Cuyo Mesosequence, Neuquén Basin) is made up by a thin, up to 30-m thick Middle Jurassiccarbonate-dominated sequence. The minor, thin siliciclastic facies in this formation (i.e. lowermost granule-pebbleshoreface conglomerate and fine-grained sandstones interbedded among the lower carbonates) record early transgressiveshoreline and shallow lagoonal-subtidal sedimentation, respectively. The major carbonate deposits have been split intosix facies and seven microfacies on the base of macroscopic field observation and petrological analysis. The carbonatefacies have been grouped into three major assemblages: 1) Tidal flat facies assemblage (including the planar laminatedalgal boundstone facies; 2) Inner platform facies assemblage (including peloidal and bioclastic wackestone, coral floatstoneand bioclastic and intraclastic packstone facies; and 3) Platform margin assemblage (including oolitic-peloidalpackstone-grainstone facies). Afossil algal record made up by dasycladacean species (Salpingoporella annulata, Cylindroporellasp. 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) Widespreadsubtidal 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 patternand 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 underupward decreasing accommodation space conditions which may be related to eustatic lowering. 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530204 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.2 Vol.3 |
| format | Artículo científico |
| id | redalyc_50530204 |
| institution | Redalyc |
| language | en |
| publishDate | 2005 |
| publisher | Universitat de Barcelona |
| spellingShingle | High frequency subtidal-peritidal cycles of the Callovian Calabozo Formation (Neuquén Basin, Western Argentina): Preliminary approach R.M. Palma Ciencias de la Tierra Subtidal Jurassic Peritidal Cyclicity Carbonate facies and microfacies High frequency subtidal-peritidal cycles of the Callovian Calabozo Formation (Neuquén Basin, Western Argentina): Preliminary approach R.M. Palma M. Medhli R.D. Piethé G.L. Lo Forte Ciencias de la Tierra Subtidal Jurassic Peritidal Cyclicity Carbonate facies and microfacies The Calabozo Formation (Cuyo Mesosequence, Neuquén Basin) is made up by a thin, up to 30-m thick Middle Jurassiccarbonate-dominated sequence. The minor, thin siliciclastic facies in this formation (i.e. lowermost granule-pebbleshoreface conglomerate and fine-grained sandstones interbedded among the lower carbonates) record early transgressiveshoreline and shallow lagoonal-subtidal sedimentation, respectively. The major carbonate deposits have been split intosix facies and seven microfacies on the base of macroscopic field observation and petrological analysis. The carbonatefacies have been grouped into three major assemblages: 1) Tidal flat facies assemblage (including the planar laminatedalgal boundstone facies; 2) Inner platform facies assemblage (including peloidal and bioclastic wackestone, coral floatstoneand bioclastic and intraclastic packstone facies; and 3) Platform margin assemblage (including oolitic-peloidalpackstone-grainstone facies). Afossil algal record made up by dasycladacean species (Salpingoporella annulata, Cylindroporellasp. 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) Widespreadsubtidal 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 patternand 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 underupward decreasing accommodation space conditions which may be related to eustatic lowering. 2005 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50530204 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.2 Vol.3 |
| title | High frequency subtidal-peritidal cycles of the Callovian Calabozo Formation (Neuquén Basin, Western Argentina): Preliminary approach |
| topic | Ciencias de la Tierra Subtidal Jurassic Peritidal Cyclicity Carbonate facies and microfacies |
| url | https://www.redalyc.org/articulo.oa?id=50530204 |