Geology and stratigraphy of lower cretaceous phosphate beds in the cerro Salado Area, Neuquén Basin, Argentina

The geological map and sedimentological study of the cerro Salado and surrounding areas in the Neuquén Province was carried out, with emphasis in the study of the Vaca Muerta and Quintuco Formations. The Vaca Muerta Formation is constituted by 20 m of black shales and bears early-mid Berriasian ammo...

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Autores principales: Scasso, Roberto Adrian, Medina, Francisco Alberto
Publicado: 2016
Materias:
Cerro Salado
Lower cretaceous
Neuquén basin
Phosphates
Quintuco formation
ammonite
Cretaceous
limestone
lithostratigraphy
phosphate
sandstone
sedimentation rate
shale
Argentina
Neuquen Basin
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v73_n4_p520_Medina
http://hdl.handle.net/20.500.12110/paper_00044822_v73_n4_p520_Medina
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00044822_v73_n4_p520_Medina
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spelling paper:paper_00044822_v73_n4_p520_Medina2023-06-08T14:26:50Z Geology and stratigraphy of lower cretaceous phosphate beds in the cerro Salado Area, Neuquén Basin, Argentina Scasso, Roberto Adrian Medina, Francisco Alberto Cerro Salado Lower cretaceous Neuquén basin Phosphates Quintuco formation ammonite Cretaceous limestone lithostratigraphy phosphate sandstone sedimentation rate shale Argentina Neuquen Basin The geological map and sedimentological study of the cerro Salado and surrounding areas in the Neuquén Province was carried out, with emphasis in the study of the Vaca Muerta and Quintuco Formations. The Vaca Muerta Formation is constituted by 20 m of black shales and bears early-mid Berriasian ammonites. The Quintuco Formation is 218 m thick and it was informally divided into three members constituted by varying proportion of gray shales and sandstones, fossiliferous limestones and coquinas, and thin tuff beds. It bears middle Berriasian to early Valanginian ammonites. The phosphatic beds in the Quintuco Formation are wackestones, bioclastic rudstones and hybrid sandstones forming condensed beds with variable mechanical reworking. They were grouped into four phosphatic intervals. Phosphatic particles are mainly nodules and subordinated, partially or totally phosphatized shells. The Vaca Muerta Formation was accumulated on external ramp to basin environment. The Quintuco Formation deposits are assigned to middle to outer ramp environments. Water depth variation was caused by sea-level oscillations. On average water depth was less than expected according to the previous paleogeographic sketch maps. This might be caused by the synsedimentary uplift of the Dorso de los Chihuidos a large structure located few tens of km to the east of the cerro Salado area. The phosphogenesis took place during sea highstands and low clastic sedimentation rates, whereas reworking by waves and currents and concentration of phosphatic particles occurred during periods of sea-level rise and fall. © 2016, Asociacion Geologica Argentina. All rights reserved. Fil:Scasso, R.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Medina, F.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2016 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v73_n4_p520_Medina http://hdl.handle.net/20.500.12110/paper_00044822_v73_n4_p520_Medina
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cerro Salado
Lower cretaceous
Neuquén basin
Phosphates
Quintuco formation
ammonite
Cretaceous
limestone
lithostratigraphy
phosphate
sandstone
sedimentation rate
shale
Argentina
Neuquen Basin
spellingShingle Cerro Salado
Lower cretaceous
Neuquén basin
Phosphates
Quintuco formation
ammonite
Cretaceous
limestone
lithostratigraphy
phosphate
sandstone
sedimentation rate
shale
Argentina
Neuquen Basin
Scasso, Roberto Adrian
Medina, Francisco Alberto
Geology and stratigraphy of lower cretaceous phosphate beds in the cerro Salado Area, Neuquén Basin, Argentina
topic_facet Cerro Salado
Lower cretaceous
Neuquén basin
Phosphates
Quintuco formation
ammonite
Cretaceous
limestone
lithostratigraphy
phosphate
sandstone
sedimentation rate
shale
Argentina
Neuquen Basin
description The geological map and sedimentological study of the cerro Salado and surrounding areas in the Neuquén Province was carried out, with emphasis in the study of the Vaca Muerta and Quintuco Formations. The Vaca Muerta Formation is constituted by 20 m of black shales and bears early-mid Berriasian ammonites. The Quintuco Formation is 218 m thick and it was informally divided into three members constituted by varying proportion of gray shales and sandstones, fossiliferous limestones and coquinas, and thin tuff beds. It bears middle Berriasian to early Valanginian ammonites. The phosphatic beds in the Quintuco Formation are wackestones, bioclastic rudstones and hybrid sandstones forming condensed beds with variable mechanical reworking. They were grouped into four phosphatic intervals. Phosphatic particles are mainly nodules and subordinated, partially or totally phosphatized shells. The Vaca Muerta Formation was accumulated on external ramp to basin environment. The Quintuco Formation deposits are assigned to middle to outer ramp environments. Water depth variation was caused by sea-level oscillations. On average water depth was less than expected according to the previous paleogeographic sketch maps. This might be caused by the synsedimentary uplift of the Dorso de los Chihuidos a large structure located few tens of km to the east of the cerro Salado area. The phosphogenesis took place during sea highstands and low clastic sedimentation rates, whereas reworking by waves and currents and concentration of phosphatic particles occurred during periods of sea-level rise and fall. © 2016, Asociacion Geologica Argentina. All rights reserved.
author Scasso, Roberto Adrian
Medina, Francisco Alberto
author_facet Scasso, Roberto Adrian
Medina, Francisco Alberto
author_sort Scasso, Roberto Adrian
title Geology and stratigraphy of lower cretaceous phosphate beds in the cerro Salado Area, Neuquén Basin, Argentina
title_short Geology and stratigraphy of lower cretaceous phosphate beds in the cerro Salado Area, Neuquén Basin, Argentina
title_full Geology and stratigraphy of lower cretaceous phosphate beds in the cerro Salado Area, Neuquén Basin, Argentina
title_fullStr Geology and stratigraphy of lower cretaceous phosphate beds in the cerro Salado Area, Neuquén Basin, Argentina
title_full_unstemmed Geology and stratigraphy of lower cretaceous phosphate beds in the cerro Salado Area, Neuquén Basin, Argentina
title_sort geology and stratigraphy of lower cretaceous phosphate beds in the cerro salado area, neuquén basin, argentina
publishDate 2016
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v73_n4_p520_Medina
http://hdl.handle.net/20.500.12110/paper_00044822_v73_n4_p520_Medina
work_keys_str_mv AT scassorobertoadrian geologyandstratigraphyoflowercretaceousphosphatebedsinthecerrosaladoareaneuquenbasinargentina
AT medinafranciscoalberto geologyandstratigraphyoflowercretaceousphosphatebedsinthecerrosaladoareaneuquenbasinargentina
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