Nanofósiles calcáreos, duración y origen de ciclos caliza-marga (Jurásico tardio de la Cuenca Neuquina) Calcareouos nannofosils, duration and origin of limestone-marl cycles (Late Jurassic, Neuquén Basin)

A nan-nofossil association corresponding to Zone NJ20b was defined in the rhythmically interbedded limestones and marls of the Los Catutos Member, Vaca Muerta Formation. It confirmed the Late Middle Tithonian age, previously assigned on the basis of ammonites, to the beds which crop out in the local...

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Autores principales: Scasso, Roberto Adrian, Concheyro, Graciela Andrea
Publicado: 1997
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v52_n4_p290_Scasso
http://hdl.handle.net/20.500.12110/paper_00044822_v52_n4_p290_Scasso
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_00044822_v52_n4_p290_Scasso2023-06-08T14:25:19Z Nanofósiles calcáreos, duración y origen de ciclos caliza-marga (Jurásico tardio de la Cuenca Neuquina) Calcareouos nannofosils, duration and origin of limestone-marl cycles (Late Jurassic, Neuquén Basin) Scasso, Roberto Adrian Concheyro, Graciela Andrea A nan-nofossil association corresponding to Zone NJ20b was defined in the rhythmically interbedded limestones and marls of the Los Catutos Member, Vaca Muerta Formation. It confirmed the Late Middle Tithonian age, previously assigned on the basis of ammonites, to the beds which crop out in the locality of Zapala, Neuquén Province, Neuquén Basin. The stratigraphical resolution of the nannoflora was no better than that of the ammonite fauna, but a good correlation between zones can be established. This represents a powerful and useful tool for future biostratigraphical studies in the Neuquén Basin. On the basis of the ammonite and nannofossil zones, a period of 1 my was estimated for the deposition of the 25 m thick sequence of limestones and marls. From these data a high sedimentation rate (5 m/ka on average) was calculated. As a consequence, the duration of the individual limestone-marl cycles is about 20 ka on average, in good agreement with the precession period of the earth axis. Thus, rhythmic changes in sedimentation would be related to climatic changes driven by orbital forcing. © 1999 Asociacián Gcológica. Fil:Scasso, R.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Concheyro, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1997 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v52_n4_p290_Scasso http://hdl.handle.net/20.500.12110/paper_00044822_v52_n4_p290_Scasso
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description A nan-nofossil association corresponding to Zone NJ20b was defined in the rhythmically interbedded limestones and marls of the Los Catutos Member, Vaca Muerta Formation. It confirmed the Late Middle Tithonian age, previously assigned on the basis of ammonites, to the beds which crop out in the locality of Zapala, Neuquén Province, Neuquén Basin. The stratigraphical resolution of the nannoflora was no better than that of the ammonite fauna, but a good correlation between zones can be established. This represents a powerful and useful tool for future biostratigraphical studies in the Neuquén Basin. On the basis of the ammonite and nannofossil zones, a period of 1 my was estimated for the deposition of the 25 m thick sequence of limestones and marls. From these data a high sedimentation rate (5 m/ka on average) was calculated. As a consequence, the duration of the individual limestone-marl cycles is about 20 ka on average, in good agreement with the precession period of the earth axis. Thus, rhythmic changes in sedimentation would be related to climatic changes driven by orbital forcing. © 1999 Asociacián Gcológica.
author Scasso, Roberto Adrian
Concheyro, Graciela Andrea
spellingShingle Scasso, Roberto Adrian
Concheyro, Graciela Andrea
Nanofósiles calcáreos, duración y origen de ciclos caliza-marga (Jurásico tardio de la Cuenca Neuquina) Calcareouos nannofosils, duration and origin of limestone-marl cycles (Late Jurassic, Neuquén Basin)
author_facet Scasso, Roberto Adrian
Concheyro, Graciela Andrea
author_sort Scasso, Roberto Adrian
title Nanofósiles calcáreos, duración y origen de ciclos caliza-marga (Jurásico tardio de la Cuenca Neuquina) Calcareouos nannofosils, duration and origin of limestone-marl cycles (Late Jurassic, Neuquén Basin)
title_short Nanofósiles calcáreos, duración y origen de ciclos caliza-marga (Jurásico tardio de la Cuenca Neuquina) Calcareouos nannofosils, duration and origin of limestone-marl cycles (Late Jurassic, Neuquén Basin)
title_full Nanofósiles calcáreos, duración y origen de ciclos caliza-marga (Jurásico tardio de la Cuenca Neuquina) Calcareouos nannofosils, duration and origin of limestone-marl cycles (Late Jurassic, Neuquén Basin)
title_fullStr Nanofósiles calcáreos, duración y origen de ciclos caliza-marga (Jurásico tardio de la Cuenca Neuquina) Calcareouos nannofosils, duration and origin of limestone-marl cycles (Late Jurassic, Neuquén Basin)
title_full_unstemmed Nanofósiles calcáreos, duración y origen de ciclos caliza-marga (Jurásico tardio de la Cuenca Neuquina) Calcareouos nannofosils, duration and origin of limestone-marl cycles (Late Jurassic, Neuquén Basin)
title_sort nanofósiles calcáreos, duración y origen de ciclos caliza-marga (jurásico tardio de la cuenca neuquina) calcareouos nannofosils, duration and origin of limestone-marl cycles (late jurassic, neuquén basin)
publishDate 1997
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v52_n4_p290_Scasso
http://hdl.handle.net/20.500.12110/paper_00044822_v52_n4_p290_Scasso
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