Facies analysis of a Toarcian-Bajocian shallow marine/coastal succession (Bardas Blancas Formation) in northern Neuquén Basin, Mendoza province, Argentina

Strata of the Bardas Blancas Formation (lower Toarcian-lower Bajocian) are exposed in northern Neuquén Basin. Five sections have been studied in this work. Shoreface/delta front to offshore deposits predominate in four of the sections studied exhibiting a high abundance of hummocky cross-stratified,...

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Autores principales:	Bressan, G.S., Kietzmann, D.A., Palma, R.M.
Formato:	JOUR
Materias:	Early-Middle Jurassic Fluvio-deltaic sedimentation Ichnology Sequence stratigraphy Siliciclastic shelf deposits Transgressive-regressive sequences abundance facies analysis hummocky cross-stratification ichnofacies ichnology Jurassic mudstone sandstone sedimentation sequence stratigraphy siliciclastic deposit succession transgression-regression cycle vertical distribution Argentina Mendoza Neuquen Basin Cruziana Skolithos
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_08959811_v43_n_p112_Bressan
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_08959811_v43_n_p112_Bressan
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spelling	todo:paper_08959811_v43_n_p112_Bressan2023-10-03T15:43:07Z Facies analysis of a Toarcian-Bajocian shallow marine/coastal succession (Bardas Blancas Formation) in northern Neuquén Basin, Mendoza province, Argentina Bressan, G.S. Kietzmann, D.A. Palma, R.M. Early-Middle Jurassic Fluvio-deltaic sedimentation Ichnology Sequence stratigraphy Siliciclastic shelf deposits Transgressive-regressive sequences abundance facies analysis hummocky cross-stratification ichnofacies ichnology Jurassic mudstone sandstone sedimentation sequence stratigraphy siliciclastic deposit succession transgression-regression cycle vertical distribution Argentina Mendoza Neuquen Basin Cruziana Skolithos Strata of the Bardas Blancas Formation (lower Toarcian-lower Bajocian) are exposed in northern Neuquén Basin. Five sections have been studied in this work. Shoreface/delta front to offshore deposits predominate in four of the sections studied exhibiting a high abundance of hummocky cross-stratified, horizontally bedded and massive sandstones, as well as massive and laminated mudstones. Shell beds and trace fossils of the mixed Skolithos-Cruziana ichnofacies appear in sandstone beds, being related with storm event deposition. Gravel deposits are frequent in only one of these sections, with planar cross-stratified, normal graded and massive orthoconglomerates characterizing fan deltas interstratified with shoreface facies. A fifth outcrop exhibiting planar cross-stratified orthoconglomerates, pebbly sandstones with low-angle stratification and laminated mudstones have been interpreted as fluvial channel deposits and overbank facies. The analysis of the vertical distribution of facies and the recognition of stratigraphic surfaces in two sections in Río Potimalal area let recognized four transgressive-regressive sequences. Forced regressive events are recognized in the regressive intervals. Comparison of vertical distribution of facies also shows differences in thickness in the lower interval among the sections studied. This would be related to variations in accommodation space by previous half-graben structures. The succession shows a retrogradational arrangement of facies related with a widespread transgressive period. Lateral variation of facies let recognize the deepening of the basin through the southwest. © 2013 Elsevier Ltd. Fil:Bressan, G.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Kietzmann, D.A. 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_08959811_v43_n_p112_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	Early-Middle Jurassic Fluvio-deltaic sedimentation Ichnology Sequence stratigraphy Siliciclastic shelf deposits Transgressive-regressive sequences abundance facies analysis hummocky cross-stratification ichnofacies ichnology Jurassic mudstone sandstone sedimentation sequence stratigraphy siliciclastic deposit succession transgression-regression cycle vertical distribution Argentina Mendoza Neuquen Basin Cruziana Skolithos
spellingShingle	Early-Middle Jurassic Fluvio-deltaic sedimentation Ichnology Sequence stratigraphy Siliciclastic shelf deposits Transgressive-regressive sequences abundance facies analysis hummocky cross-stratification ichnofacies ichnology Jurassic mudstone sandstone sedimentation sequence stratigraphy siliciclastic deposit succession transgression-regression cycle vertical distribution Argentina Mendoza Neuquen Basin Cruziana Skolithos Bressan, G.S. Kietzmann, D.A. Palma, R.M. Facies analysis of a Toarcian-Bajocian shallow marine/coastal succession (Bardas Blancas Formation) in northern Neuquén Basin, Mendoza province, Argentina
topic_facet	Early-Middle Jurassic Fluvio-deltaic sedimentation Ichnology Sequence stratigraphy Siliciclastic shelf deposits Transgressive-regressive sequences abundance facies analysis hummocky cross-stratification ichnofacies ichnology Jurassic mudstone sandstone sedimentation sequence stratigraphy siliciclastic deposit succession transgression-regression cycle vertical distribution Argentina Mendoza Neuquen Basin Cruziana Skolithos
description	Strata of the Bardas Blancas Formation (lower Toarcian-lower Bajocian) are exposed in northern Neuquén Basin. Five sections have been studied in this work. Shoreface/delta front to offshore deposits predominate in four of the sections studied exhibiting a high abundance of hummocky cross-stratified, horizontally bedded and massive sandstones, as well as massive and laminated mudstones. Shell beds and trace fossils of the mixed Skolithos-Cruziana ichnofacies appear in sandstone beds, being related with storm event deposition. Gravel deposits are frequent in only one of these sections, with planar cross-stratified, normal graded and massive orthoconglomerates characterizing fan deltas interstratified with shoreface facies. A fifth outcrop exhibiting planar cross-stratified orthoconglomerates, pebbly sandstones with low-angle stratification and laminated mudstones have been interpreted as fluvial channel deposits and overbank facies. The analysis of the vertical distribution of facies and the recognition of stratigraphic surfaces in two sections in Río Potimalal area let recognized four transgressive-regressive sequences. Forced regressive events are recognized in the regressive intervals. Comparison of vertical distribution of facies also shows differences in thickness in the lower interval among the sections studied. This would be related to variations in accommodation space by previous half-graben structures. The succession shows a retrogradational arrangement of facies related with a widespread transgressive period. Lateral variation of facies let recognize the deepening of the basin through the southwest. © 2013 Elsevier Ltd.
format	JOUR
author	Bressan, G.S. Kietzmann, D.A. Palma, R.M.
author_facet	Bressan, G.S. Kietzmann, D.A. Palma, R.M.
author_sort	Bressan, G.S.
title	Facies analysis of a Toarcian-Bajocian shallow marine/coastal succession (Bardas Blancas Formation) in northern Neuquén Basin, Mendoza province, Argentina
title_short	Facies analysis of a Toarcian-Bajocian shallow marine/coastal succession (Bardas Blancas Formation) in northern Neuquén Basin, Mendoza province, Argentina
title_full	Facies analysis of a Toarcian-Bajocian shallow marine/coastal succession (Bardas Blancas Formation) in northern Neuquén Basin, Mendoza province, Argentina
title_fullStr	Facies analysis of a Toarcian-Bajocian shallow marine/coastal succession (Bardas Blancas Formation) in northern Neuquén Basin, Mendoza province, Argentina
title_full_unstemmed	Facies analysis of a Toarcian-Bajocian shallow marine/coastal succession (Bardas Blancas Formation) in northern Neuquén Basin, Mendoza province, Argentina
title_sort	facies analysis of a toarcian-bajocian shallow marine/coastal succession (bardas blancas formation) in northern neuquén basin, mendoza province, argentina
url	http://hdl.handle.net/20.500.12110/paper_08959811_v43_n_p112_Bressan
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Facies analysis of a Toarcian-Bajocian shallow marine/coastal succession (Bardas Blancas Formation) in northern Neuquén Basin, Mendoza province, Argentina

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