Lacustrine faciès from canadon asfalto formation (callovian-oxfordian), las chacritas, cerro condor, chu-hut province

The lower section of Canadon Asfalto Formation (Callovian-Oxfordian) is located at Las Chacritas, Cerro Condor area, on the middle course of Chubut River. It is represented by lacustrine carbonate faciès with interbedded volcanic layers accumulated in the rift system of the Somuncura-Canadon Asfalto...

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Autores principales: Cabaleri, Nora Graciela, Armella, Claudia
Publicado: 1999
Materias:
bioherm
Callovian
carbonate sediment
facies analysis
Jurassic
lacustrine deposit
Oxfordian
volcanic rock
Argentina
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v54_n4_p375_Cabaleri
http://hdl.handle.net/20.500.12110/paper_00044822_v54_n4_p375_Cabaleri
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00044822_v54_n4_p375_Cabaleri
record_format dspace
spelling paper:paper_00044822_v54_n4_p375_Cabaleri2023-06-08T14:25:25Z Lacustrine faciès from canadon asfalto formation (callovian-oxfordian), las chacritas, cerro condor, chu-hut province Cabaleri, Nora Graciela Armella, Claudia bioherm Callovian carbonate sediment facies analysis Jurassic lacustrine deposit Oxfordian volcanic rock Argentina The lower section of Canadon Asfalto Formation (Callovian-Oxfordian) is located at Las Chacritas, Cerro Condor area, on the middle course of Chubut River. It is represented by lacustrine carbonate faciès with interbedded volcanic layers accumulated in the rift system of the Somuncura-Canadon Asfalto Basin. Eight microfacies (MF), defining the lake environments, and three biohermal faciès (MFB) corresponding to an extensive microbialitic belt overlying eulittoral sediments have been recognized: The microfacies are: MF1, mudstone with microbial lamination, related to supralittoral shallow ponds; MF2, biohermal intraclastic floatstone linked to storm episodes; culminating with evaporitic levels; MF3, mudstone with evidence of dessication formed in stagnant water; MF4, microbial-peloidal mudstone/wackestone with evidence of sporadic wave currents, in a eulittoral environment; MF5, intraclastic grainstone/rudstone with pedogenic alterations showing evidence of wave action in a eulittoral area; MF6, oncoidal floatstone interpreted as an hiperconcentrated flow; MF7: Bio-intra-siliciclastic packstone/wackestone accumulated in infralittoral conditions and MF8, silicified bulbous stromatolites related to the outlet of fluvial channels. The biohermal faciès are: MFB9, mudstone with stromatolites and wackestone levels; MFB10, planar stromatolites and MFB11, hemispherical stromatolites with chalk crust. Behind the biohermal belt, palustrine limestones locally show layers with episodic storm floods. The microfacial and facial distribution represents expansion and contraction cycles of a closed lake, controlled mainly by the precipitations. ©1999 Asociacián Gcológica Argentina. Fil:Cabaleri, N.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Armella, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1999 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v54_n4_p375_Cabaleri http://hdl.handle.net/20.500.12110/paper_00044822_v54_n4_p375_Cabaleri
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic bioherm
Callovian
carbonate sediment
facies analysis
Jurassic
lacustrine deposit
Oxfordian
volcanic rock
Argentina
spellingShingle bioherm
Callovian
carbonate sediment
facies analysis
Jurassic
lacustrine deposit
Oxfordian
volcanic rock
Argentina
Cabaleri, Nora Graciela
Armella, Claudia
Lacustrine faciès from canadon asfalto formation (callovian-oxfordian), las chacritas, cerro condor, chu-hut province
topic_facet bioherm
Callovian
carbonate sediment
facies analysis
Jurassic
lacustrine deposit
Oxfordian
volcanic rock
Argentina
description The lower section of Canadon Asfalto Formation (Callovian-Oxfordian) is located at Las Chacritas, Cerro Condor area, on the middle course of Chubut River. It is represented by lacustrine carbonate faciès with interbedded volcanic layers accumulated in the rift system of the Somuncura-Canadon Asfalto Basin. Eight microfacies (MF), defining the lake environments, and three biohermal faciès (MFB) corresponding to an extensive microbialitic belt overlying eulittoral sediments have been recognized: The microfacies are: MF1, mudstone with microbial lamination, related to supralittoral shallow ponds; MF2, biohermal intraclastic floatstone linked to storm episodes; culminating with evaporitic levels; MF3, mudstone with evidence of dessication formed in stagnant water; MF4, microbial-peloidal mudstone/wackestone with evidence of sporadic wave currents, in a eulittoral environment; MF5, intraclastic grainstone/rudstone with pedogenic alterations showing evidence of wave action in a eulittoral area; MF6, oncoidal floatstone interpreted as an hiperconcentrated flow; MF7: Bio-intra-siliciclastic packstone/wackestone accumulated in infralittoral conditions and MF8, silicified bulbous stromatolites related to the outlet of fluvial channels. The biohermal faciès are: MFB9, mudstone with stromatolites and wackestone levels; MFB10, planar stromatolites and MFB11, hemispherical stromatolites with chalk crust. Behind the biohermal belt, palustrine limestones locally show layers with episodic storm floods. The microfacial and facial distribution represents expansion and contraction cycles of a closed lake, controlled mainly by the precipitations. ©1999 Asociacián Gcológica Argentina.
author Cabaleri, Nora Graciela
Armella, Claudia
author_facet Cabaleri, Nora Graciela
Armella, Claudia
author_sort Cabaleri, Nora Graciela
title Lacustrine faciès from canadon asfalto formation (callovian-oxfordian), las chacritas, cerro condor, chu-hut province
title_short Lacustrine faciès from canadon asfalto formation (callovian-oxfordian), las chacritas, cerro condor, chu-hut province
title_full Lacustrine faciès from canadon asfalto formation (callovian-oxfordian), las chacritas, cerro condor, chu-hut province
title_fullStr Lacustrine faciès from canadon asfalto formation (callovian-oxfordian), las chacritas, cerro condor, chu-hut province
title_full_unstemmed Lacustrine faciès from canadon asfalto formation (callovian-oxfordian), las chacritas, cerro condor, chu-hut province
title_sort lacustrine faciès from canadon asfalto formation (callovian-oxfordian), las chacritas, cerro condor, chu-hut province
publishDate 1999
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v54_n4_p375_Cabaleri
http://hdl.handle.net/20.500.12110/paper_00044822_v54_n4_p375_Cabaleri
work_keys_str_mv AT cabalerinoragraciela lacustrinefaciesfromcanadonasfaltoformationcallovianoxfordianlaschacritascerrocondorchuhutprovince
AT armellaclaudia lacustrinefaciesfromcanadonasfaltoformationcallovianoxfordianlaschacritascerrocondorchuhutprovince
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