Nanofósiles calcáreos, duración y origen de ciclos caliza-marga (Jurásico tardío de la Cuenca Neuquina)

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Calcareouos nannofosils, duration and origin of limestone-marl cycles (Late Jurassic, Neuquén Basin). A nannofossil 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...

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Autores principales: Scasso, R.A., Concheyro, A.
Formato: JOUR
Materias:
biostratigraphy
Jurassic
limestone
nannofossil
Argentina
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v54_n3_p290_Scasso
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00044822_v54_n3_p290_Scasso
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spelling todo:paper_00044822_v54_n3_p290_Scasso2023-10-03T13:57:31Z Nanofósiles calcáreos, duración y origen de ciclos caliza-marga (Jurásico tardío de la Cuenca Neuquina) Scasso, R.A. Concheyro, A. biostratigraphy Jurassic limestone nannofossil Argentina Calcareouos nannofosils, duration and origin of limestone-marl cycles (Late Jurassic, Neuquén Basin). A nannofossil 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 Asociación Geológica Argentina. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v54_n3_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)
topic biostratigraphy
Jurassic
limestone
nannofossil
Argentina
spellingShingle biostratigraphy
Jurassic
limestone
nannofossil
Argentina
Scasso, R.A.
Concheyro, A.
Nanofósiles calcáreos, duración y origen de ciclos caliza-marga (Jurásico tardío de la Cuenca Neuquina)
topic_facet biostratigraphy
Jurassic
limestone
nannofossil
Argentina
description Calcareouos nannofosils, duration and origin of limestone-marl cycles (Late Jurassic, Neuquén Basin). A nannofossil 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 Asociación Geológica Argentina.
format JOUR
author Scasso, R.A.
Concheyro, A.
author_facet Scasso, R.A.
Concheyro, A.
author_sort Scasso, R.A.
title Nanofósiles calcáreos, duración y origen de ciclos caliza-marga (Jurásico tardío de la Cuenca Neuquina)
title_short Nanofósiles calcáreos, duración y origen de ciclos caliza-marga (Jurásico tardío de la Cuenca Neuquina)
title_full Nanofósiles calcáreos, duración y origen de ciclos caliza-marga (Jurásico tardío de la Cuenca Neuquina)
title_fullStr Nanofósiles calcáreos, duración y origen de ciclos caliza-marga (Jurásico tardío de la Cuenca Neuquina)
title_full_unstemmed Nanofósiles calcáreos, duración y origen de ciclos caliza-marga (Jurásico tardío de la Cuenca Neuquina)
title_sort nanofósiles calcáreos, duración y origen de ciclos caliza-marga (jurásico tardío de la cuenca neuquina)
url http://hdl.handle.net/20.500.12110/paper_00044822_v54_n3_p290_Scasso
work_keys_str_mv AT scassora nanofosilescalcareosduracionyorigendecicloscalizamargajurasicotardiodelacuencaneuquina
AT concheyroa nanofosilescalcareosduracionyorigendecicloscalizamargajurasicotardiodelacuencaneuquina
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