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Abstract:

The Vinchina Formation is one of the thickest Cenozoic units related to the Andean orogeny in Argentina totaling more than 5100m in thickness. Different ages, from Eocene to latest Miocene, have been postulated for this red-bed succession based on fission track, magnetostratigraphy and whole rock isotopic analyses. Two new high precision U-Pb zircon ages are reported herein for this unit. A maximum U-Pb age of 15.6±0.4Ma was obtained from detritic zircons collected from a thick tuffaceous interval of the Lower Member of the Vinchina Formation at La Cueva (Precordillera), while a depositional U-Pb age of 9.24±0.034Ma was derived from volcanic zircons collected from a thin tuff bed in the Upper Member at Quebrada de Los Pozuelos (Northwestern Sierras Pampeanas).At La Cueva, the Vinchina Formation unconformably overlies eolian sandstones of the Vallecito Formation and was divided into four units representing 1) deposits of high-sinuosity ephemeral rivers associated with 2) a playa-lake passing upwards to 3) low-sinuosity sandy ephemeral rivers and finally, 4) a gravelly-sandy braided plain. The tuffaceous level corresponding to unit 1 is located 280m above the base of the formation.At Quebrada de Los Pozuelos, the Vinchina Formation unconformably overlies the Vallecito Formation and is covered by a deeply incised surface at the base of the Toro Negro Formation. We divided the Vinchina Formation into four units. Unit 1 represents sedimentation in shallow fluvial channels with sandy to muddy floodplains. Units 2 and 3 record sedimentation in braided, meandering and anastomosing rivers. Finally unit 4 represents deposition in braided and wandering fluvial systems. The sampled tuff is located within unit 4at ~3470m above the base of the formation.The new ages indicate that the bulk of the Vinchina Formation is Miocene in age but they do not preclude a longer time span for the sedimentation of the whole unit. Ages of the sampled volcanic zircons match an important episode of volcanism recorded in the Cerro Las Tórtolas Formation, located ~90km to the west in the Andean Cordillera, but also the upper tuff could be related to the late Miocene Puna volcanism. Comparison of the new ages with previous chronological data suggests coetaneous sedimentation along different depocenters of the Bermejo basin (e.g., Vinchina and Talampaya depocenters in Western Sierras Pampeanas and La Troya depocenter and Huaco-Mogna sections in Precordillera) and strenghten the need for correlation among them. In addition the age of 15.6±0.4Ma constrains the end of the severe arid conditions recorded in the Sierras Pampeanas and Precordillera region. © 2014 Elsevier Ltd.

Registro:

Documento: Artículo
Título:New high precision U-Pb ages for the Vinchina Formation: Implications for the stratigraphy of the Bermejo Andean foreland basin (La Rioja province, western Argentina)
Autor:Ciccioli, P.L.; Limarino, C.O.; Friedman, R.; Marenssi, S.A.
Filiación:Departamento de Ciencias Geológicas- IGeBA, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires - CONICET. Ciudad Universitaria, Pabellón 2, 1 piso, C1428EHA Buenos Aires, Argentina
UBC-EOS PCIGR, 6339 Stores Road, Vancouver, BC V67 1Z4, Canada
Palabras clave:Andean foreland basin; Miocene; U-Pb ages; Vinchina formation; Andean orogeny; Cenozoic; depositional sequence; Eocene; fission track dating; foreland basin; lithostratigraphy; magnetostratigraphy; Miocene; precision; red bed; unconformity; uranium-lead dating; Argentina; La Rioja [Argentina]
Año:2014
Volumen:56
Página de inicio:200
Página de fin:213
DOI: http://dx.doi.org/10.1016/j.jsames.2014.09.005
Título revista:Journal of South American Earth Sciences
Título revista abreviado:J. South Am. Earth Sci.
ISSN:08959811
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08959811_v56_n_p200_Ciccioli

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Citas:

---------- APA ----------
Ciccioli, P.L., Limarino, C.O., Friedman, R. & Marenssi, S.A. (2014) . New high precision U-Pb ages for the Vinchina Formation: Implications for the stratigraphy of the Bermejo Andean foreland basin (La Rioja province, western Argentina). Journal of South American Earth Sciences, 56, 200-213.
http://dx.doi.org/10.1016/j.jsames.2014.09.005
---------- CHICAGO ----------
Ciccioli, P.L., Limarino, C.O., Friedman, R., Marenssi, S.A. "New high precision U-Pb ages for the Vinchina Formation: Implications for the stratigraphy of the Bermejo Andean foreland basin (La Rioja province, western Argentina)" . Journal of South American Earth Sciences 56 (2014) : 200-213.
http://dx.doi.org/10.1016/j.jsames.2014.09.005
---------- MLA ----------
Ciccioli, P.L., Limarino, C.O., Friedman, R., Marenssi, S.A. "New high precision U-Pb ages for the Vinchina Formation: Implications for the stratigraphy of the Bermejo Andean foreland basin (La Rioja province, western Argentina)" . Journal of South American Earth Sciences, vol. 56, 2014, pp. 200-213.
http://dx.doi.org/10.1016/j.jsames.2014.09.005
---------- VANCOUVER ----------
Ciccioli, P.L., Limarino, C.O., Friedman, R., Marenssi, S.A. New high precision U-Pb ages for the Vinchina Formation: Implications for the stratigraphy of the Bermejo Andean foreland basin (La Rioja province, western Argentina). J. South Am. Earth Sci. 2014;56:200-213.
http://dx.doi.org/10.1016/j.jsames.2014.09.005