Cretaceous deposits in the Precordillera of La Rioja (Ciénaga del Río Huaco Formation)

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This paper reports the presence of Maastrichtian rocks in the north of the Precordillera (La Rioja province). The Cretaceous succesion (122 m thick) is a classical red bed sequence composed of sandstones, mudstones, marls and thin levels of evaporites. According to lithological features 6 facies ass...

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Autores principales: Ciccioli, P.L., Ballent, S., Tedesco, A.M., Barreda, V., Limarino, C.O.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2005
Materias:
Continental deposits
Cretaceous
Evaporites
La Rioja
Precordillera
algae
Characeae
Cypridopsis
Cytheridea
Gastropoda
Ilyocypris
Ostracoda
Pediastrum
Spondias purpurea
Tectochara
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00044822_v60_n1_p122_Ciccioli
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paperaa:paper_00044822_v60_n1_p122_Ciccioli2023-06-12T16:40:05Z Cretaceous deposits in the Precordillera of La Rioja (Ciénaga del Río Huaco Formation) Rev. Asoc. Geol. Argent. 2005;60(1):122-131 Ciccioli, P.L. Ballent, S. Tedesco, A.M. Barreda, V. Limarino, C.O. Continental deposits Cretaceous Evaporites La Rioja Precordillera algae Characeae Cypridopsis Cytheridea Gastropoda Ilyocypris Ostracoda Pediastrum Spondias purpurea Tectochara This paper reports the presence of Maastrichtian rocks in the north of the Precordillera (La Rioja province). The Cretaceous succesion (122 m thick) is a classical red bed sequence composed of sandstones, mudstones, marls and thin levels of evaporites. According to lithological features 6 facies associations have been recognized that mainly characterize a lacustrine system developed under arid to semiarid conditions. Probably as a result of an increase in aridity, eolian sediments were deposited at the top of the Cretaceous unit. At least two transgressive-regressive events have been recognized in the lacustrine sequence. The best developed is the first event formed by fossiliferous black shales corresponding to the maximum flooding stage. These rocks have yield remains of calcareous microfossils, palynomorphs and gastropods. The former comprise charophytes, with Platychara compressa (Knowlton) an Tectochara sp. A Musacchio, anda ostracods, with Ilyocypris wichmanni punctata Musacchio y Simeoni, Eucandona? sp., Cypridopsis and Ovo cytheridea? rionegrensis Musacchio.. Palinomorphs form a monospecific assemblage of algae colonies corresponding to Pediastrum. The lithological features, stratigraphic location and fossiliferous remains clearly suggest a regional correlation with the Ciénaga del Rio Huaco Formation. This correlation considerably enlarge the regional distribution of the Cretaceous sediments which were previously limited to the Precordillera of San Juan province. © 2005 Asociación Geológica Argentina. Fil:Ciccioli, P.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tedesco, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Barreda, V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Limarino, C.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2005 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_v60_n1_p122_Ciccioli
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
topic Continental deposits
Cretaceous
Evaporites
La Rioja
Precordillera
algae
Characeae
Cypridopsis
Cytheridea
Gastropoda
Ilyocypris
Ostracoda
Pediastrum
Spondias purpurea
Tectochara
spellingShingle Continental deposits
Cretaceous
Evaporites
La Rioja
Precordillera
algae
Characeae
Cypridopsis
Cytheridea
Gastropoda
Ilyocypris
Ostracoda
Pediastrum
Spondias purpurea
Tectochara
Ciccioli, P.L.
Ballent, S.
Tedesco, A.M.
Barreda, V.
Limarino, C.O.
Cretaceous deposits in the Precordillera of La Rioja (Ciénaga del Río Huaco Formation)
topic_facet Continental deposits
Cretaceous
Evaporites
La Rioja
Precordillera
algae
Characeae
Cypridopsis
Cytheridea
Gastropoda
Ilyocypris
Ostracoda
Pediastrum
Spondias purpurea
Tectochara
description This paper reports the presence of Maastrichtian rocks in the north of the Precordillera (La Rioja province). The Cretaceous succesion (122 m thick) is a classical red bed sequence composed of sandstones, mudstones, marls and thin levels of evaporites. According to lithological features 6 facies associations have been recognized that mainly characterize a lacustrine system developed under arid to semiarid conditions. Probably as a result of an increase in aridity, eolian sediments were deposited at the top of the Cretaceous unit. At least two transgressive-regressive events have been recognized in the lacustrine sequence. The best developed is the first event formed by fossiliferous black shales corresponding to the maximum flooding stage. These rocks have yield remains of calcareous microfossils, palynomorphs and gastropods. The former comprise charophytes, with Platychara compressa (Knowlton) an Tectochara sp. A Musacchio, anda ostracods, with Ilyocypris wichmanni punctata Musacchio y Simeoni, Eucandona? sp., Cypridopsis and Ovo cytheridea? rionegrensis Musacchio.. Palinomorphs form a monospecific assemblage of algae colonies corresponding to Pediastrum. The lithological features, stratigraphic location and fossiliferous remains clearly suggest a regional correlation with the Ciénaga del Rio Huaco Formation. This correlation considerably enlarge the regional distribution of the Cretaceous sediments which were previously limited to the Precordillera of San Juan province. © 2005 Asociación Geológica Argentina.
format Artículo
Artículo
publishedVersion
author Ciccioli, P.L.
Ballent, S.
Tedesco, A.M.
Barreda, V.
Limarino, C.O.
author_facet Ciccioli, P.L.
Ballent, S.
Tedesco, A.M.
Barreda, V.
Limarino, C.O.
author_sort Ciccioli, P.L.
title Cretaceous deposits in the Precordillera of La Rioja (Ciénaga del Río Huaco Formation)
title_short Cretaceous deposits in the Precordillera of La Rioja (Ciénaga del Río Huaco Formation)
title_full Cretaceous deposits in the Precordillera of La Rioja (Ciénaga del Río Huaco Formation)
title_fullStr Cretaceous deposits in the Precordillera of La Rioja (Ciénaga del Río Huaco Formation)
title_full_unstemmed Cretaceous deposits in the Precordillera of La Rioja (Ciénaga del Río Huaco Formation)
title_sort cretaceous deposits in the precordillera of la rioja (ciénaga del río huaco formation)
publishDate 2005
url http://hdl.handle.net/20.500.12110/paper_00044822_v60_n1_p122_Ciccioli
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AT ballents cretaceousdepositsintheprecordilleraoflariojacienagadelriohuacoformation
AT tedescoam cretaceousdepositsintheprecordilleraoflariojacienagadelriohuacoformation
AT barredav cretaceousdepositsintheprecordilleraoflariojacienagadelriohuacoformation
AT limarinoco cretaceousdepositsintheprecordilleraoflariojacienagadelriohuacoformation
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