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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paper:paper_00027014_v45_n3_p513_Bressan2023-06-08T14:22:18Z Taphonomy and ichnology from storm deposits in bardas blancas formation (Lower-Middle Jurassic), Mendoza, Argentina Bressan, Graciela Susana Palma, Ricardo Manuel 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. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v45_n3_p513_Bressan 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, Graciela Susana Palma, Ricardo Manuel 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. |
| author |
Bressan, Graciela Susana Palma, Ricardo Manuel |
| author_facet |
Bressan, Graciela Susana Palma, Ricardo Manuel |
| author_sort |
Bressan, Graciela Susana |
| 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 |
| publishDate |
2008 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00027014_v45_n3_p513_Bressan http://hdl.handle.net/20.500.12110/paper_00027014_v45_n3_p513_Bressan |
| work_keys_str_mv |
AT bressangracielasusana taphonomyandichnologyfromstormdepositsinbardasblancasformationlowermiddlejurassicmendozaargentina AT palmaricardomanuel taphonomyandichnologyfromstormdepositsinbardasblancasformationlowermiddlejurassicmendozaargentina |
| _version_ |
1768544845720190976 |