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)

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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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Detalles Bibliográficos
Autores principales:	Scasso, R.A., Concheyro, A.
Formato:	Artículo publishedVersion
Lenguaje:	Inglés
Publicado:	1997
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00044822_v52_n4_p290_Scasso
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paperaa:paper_00044822_v52_n4_p290_Scasso
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spelling	paperaa:paper_00044822_v52_n4_p290_Scasso2023-06-12T16:39:53Z 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) Rev. Asoc. Geol. Argent. 1997;52(4):290-297 Scasso, R.A. Concheyro, A. 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 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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)
language	Inglés
orig_language_str_mv	eng
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.
format	Artículo Artículo publishedVersion
author	Scasso, R.A. Concheyro, A.
spellingShingle	Scasso, R.A. Concheyro, A. 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, R.A. Concheyro, A.
author_sort	Scasso, R.A.
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	http://hdl.handle.net/20.500.12110/paper_00044822_v52_n4_p290_Scasso
work_keys_str_mv	AT scassora nanofosilescalcareosduracionyorigendecicloscalizamargajurasicotardiodelacuencaneuquinacalcareouosnannofosilsdurationandoriginoflimestonemarlcycleslatejurassicneuquenbasin AT concheyroa nanofosilescalcareosduracionyorigendecicloscalizamargajurasicotardiodelacuencaneuquinacalcareouosnannofosilsdurationandoriginoflimestonemarlcycleslatejurassicneuquenbasin
_version_	1769810202803044352

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)

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