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Abstract:

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.

Registro:

Documento: Artículo
Título:Petrology and geochemistry of a limestone-marl rhythmite from the Southern Hemisphere: The Los Catutos Member (Vaca Muerta Formation). Middle Tithonian of Neuquén Basin
Autor:Scasso, R.A.; Alonso, M.S.; Lanés, S.; Villar, H.J.; Lippai, H.
Filiación:Depto. de Ciencias Geologicas, FCEN, Universidad de Buenos Aires, Pabellón 2, Buenos Aires 1428, Argentina
CONICET, Buenos Aires, Argentina
Palabras clave:Cyclicity; Geochemistry; Limestone; Neuquen Basin; Rhytmite; Stable isotopes; Upper Jurassic; cyclic sedimentation; depositional environment; Jurassic; limestone; marl; rhythmite; Tithonian; Argentina
Año:2002
Volumen:57
Número:2
Página de inicio:143
Página de fin:159
Handle:http://hdl.handle.net/20.500.12110/paper_00044822_v57_n2_p143_Scasso
Título revista:Revista de la Asociacion Geologica Argentina
Título revista abreviado:Rev. Asoc. Geol. Argent.
ISSN:00044822
PDF:https://bibliotecadigital.exactas.uba.ar/download/paper/paper_00044822_v57_n2_p143_Scasso.pdf
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v57_n2_p143_Scasso

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Citas:

---------- APA ----------
Scasso, R.A., Alonso, M.S., Lanés, S., Villar, H.J. & Lippai, H. (2002) . Petrology and geochemistry of a limestone-marl rhythmite from the Southern Hemisphere: The Los Catutos Member (Vaca Muerta Formation). Middle Tithonian of Neuquén Basin . Revista de la Asociacion Geologica Argentina, 57(2), 143-159.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v57_n2_p143_Scasso [ ]
---------- CHICAGO ----------
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 " . Revista de la Asociacion Geologica Argentina 57, no. 2 (2002) : 143-159.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v57_n2_p143_Scasso [ ]
---------- MLA ----------
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 " . Revista de la Asociacion Geologica Argentina, vol. 57, no. 2, 2002, pp. 143-159.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v57_n2_p143_Scasso [ ]
---------- VANCOUVER ----------
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 . Rev. Asoc. Geol. Argent. 2002;57(2):143-159.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v57_n2_p143_Scasso [ ]