Taphonomy and ichnology from storm deposits in bardas blancas formation (Lower-Middle Jurassic), Mendoza, Argentina

The Bardas Blancas Formation (Toarcian-Bajocian) of the Neuquen Basin in no Potimalal area is characterized on the basis of sedimentologic, taphonomic and ichnologic criteria. The taphonomic attributes and their relation to the lithofacies allow us to distinguish five different bioclastic deposits (...

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Autores principales: Bressan, G.S., Palma, R.M.
Formato: JOUR
Materias:
Bardas blancas formation
Bioclastic deposits
Ichnofacies
Jurassic
Storms
concentration (composition)
ichnology
lithofacies
mollusc
relative abundance
sandstone
sedimentology
storm deposit
taphonomy
tempestite
Argentina
Neuquen Basin
South America
Abbreviata
Bivalvia
Cephalopoda
Cruziana
Gastropoda
Mollusca
Palaeophycus
Planolites
Skolithos
Thalassinoides
Trigonia
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00027014_v45_n3_p513_Bressan
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00027014_v45_n3_p513_Bressan
record_format dspace
spelling todo:paper_00027014_v45_n3_p513_Bressan2023-10-03T13:53:04Z Taphonomy and ichnology from storm deposits in bardas blancas formation (Lower-Middle Jurassic), Mendoza, Argentina Bressan, G.S. Palma, R.M. Bardas blancas formation Bioclastic deposits Ichnofacies Jurassic Storms concentration (composition) ichnology Jurassic lithofacies mollusc relative abundance sandstone sedimentology storm deposit taphonomy tempestite Argentina Neuquen Basin South America Abbreviata Bivalvia Cephalopoda Cruziana Gastropoda Mollusca Palaeophycus Planolites Skolithos Thalassinoides Trigonia The Bardas Blancas Formation (Toarcian-Bajocian) of the Neuquen Basin in no Potimalal area is characterized on the basis of sedimentologic, taphonomic and ichnologic criteria. The taphonomic attributes and their relation to the lithofacies allow us to distinguish five different bioclastic deposits (BD): (1) BD1, hummocky cross-stratified shell concentrations; (2) BD2, lenticular or tabular shell concentrations in hummocky cross-stratified sandstones; (3) BD3, shell "lags"; (4) BD4, complex shell beds; (5) BD5, shell beds in massive fine-medium grained sandstones. BD3 have been interpreted as storm relaxation flows, whereas BD1-BD2 has been interpreted as proximal tempestites and BD4-BD5 as distal tempestites. Molluscs taxa recorded include bivalves, cephalopods and gastropods, in order of decreasing of his relative abundance. Pholadomya cf. abbreviata Hupé, Meleagrinella cf. echinata (Sowerby) and Neocrassina andium (Gottsche) are present in sandstone facies while, Pholadomya laevigata Hupé and Trigonia (Trigonia) sp. are abundant in mudstone facies. Ichnofauna includes Skolithos and Ophiomorpha that may be assigned to the Skolithos ichnofacies, and Thalassinoides, Palaeophycus, Planolites and Chondrites, assigned to the Cruziana ichnofacies. In the study area, there are three deepening upward successions averaging 26, 17 and 25 m in thickness. The analysis and interpretation of sedimentologic, taphonomic and ichnologic features suggests a storm-dominated shelf, in a zone comprised from shoreface and outer shelf areas. © Asociación Paleontológica Argentina. Fil:Bressan, G.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Palma, R.M. 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_00027014_v45_n3_p513_Bressan
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Bardas blancas formation
Bioclastic deposits
Ichnofacies
Jurassic
Storms
concentration (composition)
ichnology
Jurassic
lithofacies
mollusc
relative abundance
sandstone
sedimentology
storm deposit
taphonomy
tempestite
Argentina
Neuquen Basin
South America
Abbreviata
Bivalvia
Cephalopoda
Cruziana
Gastropoda
Mollusca
Palaeophycus
Planolites
Skolithos
Thalassinoides
Trigonia
spellingShingle Bardas blancas formation
Bioclastic deposits
Ichnofacies
Jurassic
Storms
concentration (composition)
ichnology
Jurassic
lithofacies
mollusc
relative abundance
sandstone
sedimentology
storm deposit
taphonomy
tempestite
Argentina
Neuquen Basin
South America
Abbreviata
Bivalvia
Cephalopoda
Cruziana
Gastropoda
Mollusca
Palaeophycus
Planolites
Skolithos
Thalassinoides
Trigonia
Bressan, G.S.
Palma, R.M.
Taphonomy and ichnology from storm deposits in bardas blancas formation (Lower-Middle Jurassic), Mendoza, Argentina
topic_facet Bardas blancas formation
Bioclastic deposits
Ichnofacies
Jurassic
Storms
concentration (composition)
ichnology
Jurassic
lithofacies
mollusc
relative abundance
sandstone
sedimentology
storm deposit
taphonomy
tempestite
Argentina
Neuquen Basin
South America
Abbreviata
Bivalvia
Cephalopoda
Cruziana
Gastropoda
Mollusca
Palaeophycus
Planolites
Skolithos
Thalassinoides
Trigonia
description The Bardas Blancas Formation (Toarcian-Bajocian) of the Neuquen Basin in no Potimalal area is characterized on the basis of sedimentologic, taphonomic and ichnologic criteria. The taphonomic attributes and their relation to the lithofacies allow us to distinguish five different bioclastic deposits (BD): (1) BD1, hummocky cross-stratified shell concentrations; (2) BD2, lenticular or tabular shell concentrations in hummocky cross-stratified sandstones; (3) BD3, shell "lags"; (4) BD4, complex shell beds; (5) BD5, shell beds in massive fine-medium grained sandstones. BD3 have been interpreted as storm relaxation flows, whereas BD1-BD2 has been interpreted as proximal tempestites and BD4-BD5 as distal tempestites. Molluscs taxa recorded include bivalves, cephalopods and gastropods, in order of decreasing of his relative abundance. Pholadomya cf. abbreviata Hupé, Meleagrinella cf. echinata (Sowerby) and Neocrassina andium (Gottsche) are present in sandstone facies while, Pholadomya laevigata Hupé and Trigonia (Trigonia) sp. are abundant in mudstone facies. Ichnofauna includes Skolithos and Ophiomorpha that may be assigned to the Skolithos ichnofacies, and Thalassinoides, Palaeophycus, Planolites and Chondrites, assigned to the Cruziana ichnofacies. In the study area, there are three deepening upward successions averaging 26, 17 and 25 m in thickness. The analysis and interpretation of sedimentologic, taphonomic and ichnologic features suggests a storm-dominated shelf, in a zone comprised from shoreface and outer shelf areas. © Asociación Paleontológica Argentina.
format JOUR
author Bressan, G.S.
Palma, R.M.
author_facet Bressan, G.S.
Palma, R.M.
author_sort Bressan, G.S.
title Taphonomy and ichnology from storm deposits in bardas blancas formation (Lower-Middle Jurassic), Mendoza, Argentina
title_short Taphonomy and ichnology from storm deposits in bardas blancas formation (Lower-Middle Jurassic), Mendoza, Argentina
title_full Taphonomy and ichnology from storm deposits in bardas blancas formation (Lower-Middle Jurassic), Mendoza, Argentina
title_fullStr Taphonomy and ichnology from storm deposits in bardas blancas formation (Lower-Middle Jurassic), Mendoza, Argentina
title_full_unstemmed Taphonomy and ichnology from storm deposits in bardas blancas formation (Lower-Middle Jurassic), Mendoza, Argentina
title_sort taphonomy and ichnology from storm deposits in bardas blancas formation (lower-middle jurassic), mendoza, argentina
url http://hdl.handle.net/20.500.12110/paper_00027014_v45_n3_p513_Bressan
work_keys_str_mv AT bressangs taphonomyandichnologyfromstormdepositsinbardasblancasformationlowermiddlejurassicmendozaargentina
AT palmarm taphonomyandichnologyfromstormdepositsinbardasblancasformationlowermiddlejurassicmendozaargentina
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