Petrology and geochemistry of a limestone-marl rhythmite from the Southern Hemisphere: The Los Catutos Member (Vaca Muerta Formation). Middle Tithonian of Neuquén Basin

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A 25 m thick, rhythmic, limestone-marl alternation of Los Catutos Member (Vaca Muerta Formation, Neuquén Basin), was studied bed by hed in several quarries near Zapala. Beds up to 1 m thick are of massive or laminated, lithographic, fossiliferous limestone, locally mottled or weakly bioturbated (?Ch...

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Autores principales: Scasso, R.A., Alonso, M.S., Lanés, S., Villar, H.J., Lippai, H.
Formato: JOUR
Materias:
Cyclicity
Geochemistry
Limestone
Neuquen Basin
Rhytmite
Stable isotopes
Upper Jurassic
cyclic sedimentation
depositional environment
Jurassic
limestone
marl
rhythmite
Tithonian
Argentina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v57_n2_p143_Scasso
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00044822_v57_n2_p143_Scasso2023-10-03T13:57:42Z Petrology and geochemistry of a limestone-marl rhythmite from the Southern Hemisphere: The Los Catutos Member (Vaca Muerta Formation). Middle Tithonian of Neuquén Basin Scasso, R.A. Alonso, M.S. Lanés, S. Villar, H.J. Lippai, H. Cyclicity Geochemistry Limestone Neuquen Basin Rhytmite Stable isotopes Upper Jurassic cyclic sedimentation depositional environment Jurassic limestone marl rhythmite Tithonian Argentina A 25 m thick, rhythmic, limestone-marl alternation of Los Catutos Member (Vaca Muerta Formation, Neuquén Basin), was studied bed by hed in several quarries near Zapala. Beds up to 1 m thick are of massive or laminated, lithographic, fossiliferous limestone, locally mottled or weakly bioturbated (?Chondrites), interbedded with thinner marl beds. Limestones and marls can be classified as pelbiomicrites and biopelmicrites, mainly composed of pellets, radiolaria, forams, ostracods, equinoids, spicles of sponges and gastropods, with minor amounts of peloids, feldspar, chert, muscovite, glauconite and phosphates. Values for δ18O and δ13C are similar to those of lithographic limestones from the northern hemisphere. δ13O values are most probably result of diagenetic modification of the primary signal but the δ13C agrees well with the published curves for the Tithonian sea water and with other records from Tethyan limestones. A preliminary analysis of negative excursions of δ13C point to productivity crisis in the sedimentary system with a periodicity of 400 ka, which can be a result of changes in the orbital eccentricity of the earth. Smectite and interlayers reflect pedogenic processes developed on volcanogenic source-rocks, whereas more abundant kaolinite in marls might reflect more humid conditions. With TOC up to 1.95% the rocks offer prospects as a regular to good source rock for hydrocarbons, although thermally immature. A low-energy, dysaerobic, open-marine environment is inferred for Los Catutos Member, with high sedimentation rates as a result of high productivity at the sea-surface and incoming plumes of suspended sediment from the inner shelf. Sediment accumulation in wide and gently dipping calcareous bulges in an outer ramp system is envisaged. Fil:Scasso, R.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Alonso, M.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lanés, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Lippai, H. 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_00044822_v57_n2_p143_Scasso
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cyclicity
Geochemistry
Limestone
Neuquen Basin
Rhytmite
Stable isotopes
Upper Jurassic
cyclic sedimentation
depositional environment
Jurassic
limestone
marl
rhythmite
Tithonian
Argentina
spellingShingle Cyclicity
Geochemistry
Limestone
Neuquen Basin
Rhytmite
Stable isotopes
Upper Jurassic
cyclic sedimentation
depositional environment
Jurassic
limestone
marl
rhythmite
Tithonian
Argentina
Scasso, R.A.
Alonso, M.S.
Lanés, S.
Villar, H.J.
Lippai, H.
Petrology and geochemistry of a limestone-marl rhythmite from the Southern Hemisphere: The Los Catutos Member (Vaca Muerta Formation). Middle Tithonian of Neuquén Basin
topic_facet Cyclicity
Geochemistry
Limestone
Neuquen Basin
Rhytmite
Stable isotopes
Upper Jurassic
cyclic sedimentation
depositional environment
Jurassic
limestone
marl
rhythmite
Tithonian
Argentina
description A 25 m thick, rhythmic, limestone-marl alternation of Los Catutos Member (Vaca Muerta Formation, Neuquén Basin), was studied bed by hed in several quarries near Zapala. Beds up to 1 m thick are of massive or laminated, lithographic, fossiliferous limestone, locally mottled or weakly bioturbated (?Chondrites), interbedded with thinner marl beds. Limestones and marls can be classified as pelbiomicrites and biopelmicrites, mainly composed of pellets, radiolaria, forams, ostracods, equinoids, spicles of sponges and gastropods, with minor amounts of peloids, feldspar, chert, muscovite, glauconite and phosphates. Values for δ18O and δ13C are similar to those of lithographic limestones from the northern hemisphere. δ13O values are most probably result of diagenetic modification of the primary signal but the δ13C agrees well with the published curves for the Tithonian sea water and with other records from Tethyan limestones. A preliminary analysis of negative excursions of δ13C point to productivity crisis in the sedimentary system with a periodicity of 400 ka, which can be a result of changes in the orbital eccentricity of the earth. Smectite and interlayers reflect pedogenic processes developed on volcanogenic source-rocks, whereas more abundant kaolinite in marls might reflect more humid conditions. With TOC up to 1.95% the rocks offer prospects as a regular to good source rock for hydrocarbons, although thermally immature. A low-energy, dysaerobic, open-marine environment is inferred for Los Catutos Member, with high sedimentation rates as a result of high productivity at the sea-surface and incoming plumes of suspended sediment from the inner shelf. Sediment accumulation in wide and gently dipping calcareous bulges in an outer ramp system is envisaged.
format JOUR
author Scasso, R.A.
Alonso, M.S.
Lanés, S.
Villar, H.J.
Lippai, H.
author_facet Scasso, R.A.
Alonso, M.S.
Lanés, S.
Villar, H.J.
Lippai, H.
author_sort Scasso, R.A.
title Petrology and geochemistry of a limestone-marl rhythmite from the Southern Hemisphere: The Los Catutos Member (Vaca Muerta Formation). Middle Tithonian of Neuquén Basin
title_short Petrology and geochemistry of a limestone-marl rhythmite from the Southern Hemisphere: The Los Catutos Member (Vaca Muerta Formation). Middle Tithonian of Neuquén Basin
title_full Petrology and geochemistry of a limestone-marl rhythmite from the Southern Hemisphere: The Los Catutos Member (Vaca Muerta Formation). Middle Tithonian of Neuquén Basin
title_fullStr Petrology and geochemistry of a limestone-marl rhythmite from the Southern Hemisphere: The Los Catutos Member (Vaca Muerta Formation). Middle Tithonian of Neuquén Basin
title_full_unstemmed Petrology and geochemistry of a limestone-marl rhythmite from the Southern Hemisphere: The Los Catutos Member (Vaca Muerta Formation). Middle Tithonian of Neuquén Basin
title_sort petrology and geochemistry of a limestone-marl rhythmite from the southern hemisphere: the los catutos member (vaca muerta formation). middle tithonian of neuquén basin
url http://hdl.handle.net/20.500.12110/paper_00044822_v57_n2_p143_Scasso
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