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Abstract:

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.

Registro:

Documento: Artículo
Título:Facies analysis of a Toarcian-Bajocian shallow marine/coastal succession (Bardas Blancas Formation) in northern Neuquén Basin, Mendoza province, Argentina
Autor:Bressan, G.S.; Kietzmann, D.A.; Palma, R.M.
Filiación:Grupo de Carbonatos y Cicloestratigrafia, Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires - Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET), Argentina
Palabras clave: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
Año:2013
Volumen:43
Página de inicio:112
Página de fin:126
DOI: http://dx.doi.org/10.1016/j.jsames.2013.01.007
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v43_n_p112_Bressan

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Citas:

---------- APA ----------
Bressan, G.S., Kietzmann, D.A. & Palma, R.M. (2013) . Facies analysis of a Toarcian-Bajocian shallow marine/coastal succession (Bardas Blancas Formation) in northern Neuquén Basin, Mendoza province, Argentina. Journal of South American Earth Sciences, 43, 112-126.
http://dx.doi.org/10.1016/j.jsames.2013.01.007
---------- CHICAGO ----------
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" . Journal of South American Earth Sciences 43 (2013) : 112-126.
http://dx.doi.org/10.1016/j.jsames.2013.01.007
---------- MLA ----------
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" . Journal of South American Earth Sciences, vol. 43, 2013, pp. 112-126.
http://dx.doi.org/10.1016/j.jsames.2013.01.007
---------- VANCOUVER ----------
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. J. South Am. Earth Sci. 2013;43:112-126.
http://dx.doi.org/10.1016/j.jsames.2013.01.007