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Abstract:

The Upper Jurassic Tordillo Formation at Cañada Ancha area, northern Neuquén Basin, Argentina, comprises a multi-stage suit of predominantly alluvial sediments that is heterolithic in nature. In that suit, several lithofacies, architectural elements, and bounding surfaces of different order have been identified and their lateral and vertical distribution characterized. This analysis allowed the differentiation of 3 main units (lower, middle and upper), 20 subunits (C-1 to C-20), and the characterization of their alluvial styles. The lower unit (which comprises subunits C-1 to C-4) is mainly formed by fine- to medium-grained sandstones, which become medium- to coarse-grained towards the top. These sandstones characterize settings ranging from floodplains with isolated, unconfined flows, to more complex, vertically stacked, multi-storey sheet sandstones of braided fluvial systems. The middle unit (C-5 to C-10) is dominated by pale brown-grey fine-to coarse-grained sands and medium size subangular to angular conglomerates, which reflect amalgamated complexes of sandstone sheets and downstream accretion macroforms. Remarkably, this alluvial sedimentation was episodically punctuated by volcaniclastic flows. The upper unit (C-11 to C-20) consists of finer sediments, mainly pink to white fine-to medium grained sandstones and red to green siltstones. Towards the top, bioturbation becomes important, and also the presence of volcanosedimentary flows is noticeable. Fluvial settings include braided sheet sandstones with waning flood deposits evolving to isolated high-sinuosity fluvial systems, with flash flood deposits. At the top of this unit, facies may suggest marine influence. Vertical changes in the fluvial style result from both climatic and tectonic controls. A semiarid to arid climate and the active tectonism linked to the eastward migration of the Andean volcanic arc determined major bounding surfaces, fluvial style evolution and the presence of the volcano-sedimentary deposits. Different stages of high and low subsidence rates has been deduced from the vertical stacking of sediments. © 2009 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Architecture and development of the alluvial sediments of the Upper Jurassic Tordillo Formation in the Cañada Ancha Valley, northern Neuquén Basin, Argentina
Autor:López-Gómez, J.; Martín-Chivelet, J.; Palma, R.M.
Filiación:Instituto de Geología Económica, Departamento de Estratigrafía (CSIC-UCM), Facultad de Geología, C/Antonio Nováis 2, 28040 Madrid, Spain
Departamento de Ciencias Exactas y Naturales, Universidad de Buenos Aires-CONICET, Pabellón II, 1428 Buenos Aires, Argentina
Palabras clave:Alluvial architecture; Argentina; Back-arc basin; Kimmeridgian; Neuquén Basin; Tordillo Formation; alluvial deposit; backarc basin; braided river; floodplain; Kimmeridgian; sandstone; vertical distribution; Argentina; Neuquen Basin; South America
Año:2009
Volumen:219
Número:1-4
Página de inicio:180
Página de fin:195
DOI: http://dx.doi.org/10.1016/j.sedgeo.2009.05.006
Título revista:Sedimentary Geology
Título revista abreviado:Sediment. Geol.
ISSN:00370738
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00370738_v219_n1-4_p180_LopezGomez

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Citas:

---------- APA ----------
López-Gómez, J., Martín-Chivelet, J. & Palma, R.M. (2009) . Architecture and development of the alluvial sediments of the Upper Jurassic Tordillo Formation in the Cañada Ancha Valley, northern Neuquén Basin, Argentina. Sedimentary Geology, 219(1-4), 180-195.
http://dx.doi.org/10.1016/j.sedgeo.2009.05.006
---------- CHICAGO ----------
López-Gómez, J., Martín-Chivelet, J., Palma, R.M. "Architecture and development of the alluvial sediments of the Upper Jurassic Tordillo Formation in the Cañada Ancha Valley, northern Neuquén Basin, Argentina" . Sedimentary Geology 219, no. 1-4 (2009) : 180-195.
http://dx.doi.org/10.1016/j.sedgeo.2009.05.006
---------- MLA ----------
López-Gómez, J., Martín-Chivelet, J., Palma, R.M. "Architecture and development of the alluvial sediments of the Upper Jurassic Tordillo Formation in the Cañada Ancha Valley, northern Neuquén Basin, Argentina" . Sedimentary Geology, vol. 219, no. 1-4, 2009, pp. 180-195.
http://dx.doi.org/10.1016/j.sedgeo.2009.05.006
---------- VANCOUVER ----------
López-Gómez, J., Martín-Chivelet, J., Palma, R.M. Architecture and development of the alluvial sediments of the Upper Jurassic Tordillo Formation in the Cañada Ancha Valley, northern Neuquén Basin, Argentina. Sediment. Geol. 2009;219(1-4):180-195.
http://dx.doi.org/10.1016/j.sedgeo.2009.05.006