%0 Journal Article
%T Las tempestitas peloidales de la formaci車n Vaca Muerta (Tithoniano-Valanginiano) en el sector surmendocino de la Cuenca Neuquina, Argentina
%A Diego A. Kietzmann
%A Ricardo M. Palma
%J Latin American Journal of Sedimentology and Basin Analysis
%D 2011
%I Asociaci車n Argentina de Sedimentolog赤a
%X Se analizan los dep車sitos de tormenta de dos secciones estratigr芍ficas de la Formaci車n Vaca Muerta (Tithoniano-Valanginiano) en el 芍rea de Bardas Blancas, sur de la provincia de Mendoza. Estos dep車sitos incluyen: a) dep車sitos con estratificaci車n entrecruzada de bajo 芍ngulo; b) dep車sitos con estratificaci車n entrecruzada hummocky de peque a y gran escala; y c) dep車sitos laminados con gradaci車n normal intral芍mina. Las secuencias completas con HCS est芍n compuestas por tres unidades (Sa, Sb y Sc) asociadas al evento de tormenta y una unidad que incluye dep車sitos de post-tormenta y de buen tiempo (Sd). La comparaci車n con ejemplos actuales y ejemplos del registro, permite estimar un rango batim谷trico de 25 a 50 m para los dep車sitos con estratificaci車n entrecruzada hummocky. Asimismo se discuten posibles or赤genes alternativos relacionados con inestabilidades en la interfase de la picnoclina y los efectos de la compactaci車n sobre la preservaci車n de las texturas y estructuras primarias de los dep車sitos de la Formaci車n Vaca Muerta. Storm deposits (tempestites) have been extensively studied in the sedimentary record, particularly those deposits with hummocky cross-stratification, knowing their bathymetric ranks, facies models and their hydrodynamic conditions (Harms et al., 1975; Dott y Burgeois, 1982; Dumas y Arnott, 2006). However, detailed studies in carbonate sediments are relatively scarce. Recently, other types of interference generated at the picnocline interface (internal waves) were proposed to interpret similar deposits without being controlled by the position of the of storm-wave level (Pomar et al., 2012). The Tithonian - Valanginian deposits in the southern Mendoza - Neuqu谷n Basin are particularly interesting because of their association with a homoclinal carbonate ramp system. During the Late Jurassic - Early Cretaceous a series of marine sequences were developed throughout the basin that are grouped under the Mendoza Group. In the southern Mendoza area it includes the Vaca Muerta Formation (early Tithonian - early Valanginian), the Chachao Formation (early Valanginian) and the Agrio Formation (early Valanginian - early Barremian) (Figs. 1 and 2). The Vaca Muerta Formation is widely distributed over the entire Neuqu谷n Basin. It consists of dark bituminous shales, marls and limestones deposited in response to a rapid and widespread marine transgression originated from the Pacific Ocean, as consequence of a tectonic phase of compressional relaxation (Legarreta and Uliana, 1991). While initial studies show significant variations in the proportions of diff
%K Tempestitas
%K Pseudomatriz carbon芍tica
%K Rampa carbon芍tica
%K Jur芍sico-Cret芍cico
%K Tempestites
%K Carbonate pseudomatrix
%K Carbonate ramp
%K Jurassic-Cretaceous
%U http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-49792011000200004