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Abstract:

The Upper Triassic Ischigualasto Formation in NW Argentina was deposited in a fluvial system during the synrift filling of the extensional Ischigualasto-Villa Unión Basin. The expansive exposures of the fluvial architecture and paleosols provide a framework to reconstruct the paleoenvironmental evolution of this basin during the Upper Triassic using continental sequence stratigraphy. The Ischigualasto Formation deposition can be divided into seven sequential sedimentary stages: the 1) Bypass stage; 2) Confined low-accommodation stage; 3) Confined high accommodation stage; 4) Unstable-accommodation stage; 5) Unconfined high-accommodation stage; 6) Unconfined low-accommodation stage; and finally, 7) Unconfined high-accommodation stage. The sedimentary evolution of the Ischigualasto Formation was driven by different allogenic controls such as rises and falls in lake levels, local tectonism, subsidence, volcanism, and climate, which also produced modifications of the equilibrium profile of the fluvial systems. All of these factors result in different accommodations in central and flank areas of the basin, which led to different architectural configurations of channels and floodplains. Allogenic processes affected not only the sequence stratigraphy of the basin but also the vertebrate and plant taphocenosis. Therefore, the sequence stratigraphy can be used not only as a predictive tool related to fossil occurrence but also to understand the taphonomic history of the basin at each temporal interval. © 2017 Elsevier B.V.

Registro:

Documento: Artículo
Título:Allogenic controls on the fluvial architecture and fossil preservation of the Upper Triassic Ischigualasto Formation, NW Argentina
Autor:Colombi, C.E.; Limarino, C.O.; Alcober, O.A.
Filiación:Instituto y Museo de Ciencias Naturales, Universidad Nacional de San Juan, Centro de Investigaciones de la Geosfera y la Biosfera – Conicet, España 400 (Norte), San Juan, Argentina
Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires – Conicet, Departamento de Geología, Facultad de Ciencias Exactas y Naturales, Pabellón 11, Ciudad Universitaria, Buenos Aires, 1428, Argentina
Instituto y Museo de Ciencias Naturales, Universidad Nacional de San Juan, España 400 (Norte), San Juan, Argentina
Palabras clave:Continental deposition; Sequence stratigraphy; Taphonomy; Tectonic subsidence; Triassic; Volcanism; Biological materials preservation; Deposition; Sedimentology; Subsidence; Equilibrium profiles; Predictive tools; Sedimentary evolution; Sequence stratigraphy; Taphonomy; Temporal intervals; Triassic; Volcanism; Stratigraphy; deposition; fluvial deposit; fossil; lithostratigraphy; paleoenvironment; sequence stratigraphy; subsidence; taphonomy; tectonics; Triassic; volcanism; Argentina; Vertebrata
Año:2017
Volumen:362
Página de inicio:1
Página de fin:16
DOI: http://dx.doi.org/10.1016/j.sedgeo.2017.10.003
Título revista:Sedimentary Geology
Título revista abreviado:Sediment. Geol.
ISSN:00370738
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00370738_v362_n_p1_Colombi

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Citas:

---------- APA ----------
Colombi, C.E., Limarino, C.O. & Alcober, O.A. (2017) . Allogenic controls on the fluvial architecture and fossil preservation of the Upper Triassic Ischigualasto Formation, NW Argentina. Sedimentary Geology, 362, 1-16.
http://dx.doi.org/10.1016/j.sedgeo.2017.10.003
---------- CHICAGO ----------
Colombi, C.E., Limarino, C.O., Alcober, O.A. "Allogenic controls on the fluvial architecture and fossil preservation of the Upper Triassic Ischigualasto Formation, NW Argentina" . Sedimentary Geology 362 (2017) : 1-16.
http://dx.doi.org/10.1016/j.sedgeo.2017.10.003
---------- MLA ----------
Colombi, C.E., Limarino, C.O., Alcober, O.A. "Allogenic controls on the fluvial architecture and fossil preservation of the Upper Triassic Ischigualasto Formation, NW Argentina" . Sedimentary Geology, vol. 362, 2017, pp. 1-16.
http://dx.doi.org/10.1016/j.sedgeo.2017.10.003
---------- VANCOUVER ----------
Colombi, C.E., Limarino, C.O., Alcober, O.A. Allogenic controls on the fluvial architecture and fossil preservation of the Upper Triassic Ischigualasto Formation, NW Argentina. Sediment. Geol. 2017;362:1-16.
http://dx.doi.org/10.1016/j.sedgeo.2017.10.003