%0 Journal Article
%T Las sucesiones sedimentarias continentales expuestas en Centinela del Mar, provincia de Buenos Aires, Argentina (Pleistoceno Inferior-Holoceno)
%A Cenizo
%A Marcos M.
%J Estudios Geologicos
%D 2011
%I Consejo Superior de Investigaciones Cient¨ªficas
%R 10.3989/egeol.40283.125
%X In the present paper, the geomorphological and sedimentary characteristics of the continental sequences exposed on the coastal cliffs and surrounding areas of the Centinela del Mar locality are described and interpreted. Fourteen lithofacies are defined, their relation, geometry and structure are represented using transversal and longitudinal detailed profiles. In the basal and medium sector of the profile, facies of different degrees of transport and aqueous rework were recognized. In the superior sector, a succession of marine peri-coastal facies corresponding to the  Belgranense  transgression (=Fm. Pascua) were identified, ending the secuence with relictual eolic facies. The different historical interpretations are discussed, homologating the units referred previously with the ones proposed on this paper. These units are correlated with those defined in the allostratigrapic scheme proposed by other authors for the area covered between Playa San Carlos and Arroyo Chapadmalal. This allowed recognize for the area under study the presence of the Punta San Andr¨¦s and Arroyo Lober¨ªa Alloformations (basal-medium and superior sector, respectively). Between these two entities, a association of well defined progradant marine facies are found and named on this paper as Centinela del Mar Alloformation. Finally, the information gathered here (magnetostratigraphy, radiometric dating, stratigraphic correlations, etc) indicates, at least preliminarily, that the secuence of Centinela del Mar corresponds to the Ensenadense-Lujanense interval (Lower Pleistocene - Holocene). Son descriptas e interpretadas las caracter¨ªsticas geomorfol¨®gicas y sedimentarias de las sucesiones continentales expuestas en los acantilados litorales y sectores aleda os de la localidad Centinela del Mar. Se definen catorce litofacies, cuyas relaciones, geometr¨ªa y estructuras son representadas mediante perfiles transversales y longitudinales de detalle. En el sector basal y medio del perfil fueron reconocidas facies de distinto grado de transporte y retrabajo ¨¢cueo, en tanto, en el sector superior fue identificada una secuencia de facies marinas y perilitorales correspondientes a la transgresi¨®n  Belgranense  (=Fm. Pascua), culminando la sucesi¨®n facies e¨®licas relictuales. Las diferentes interpretaciones hist¨®ricas son ampliamente discutidas, homolog¨¢ndose las unidades referidas previamente con las propuestas en este trabajo. Dichas unidades se correlacionan con aquellas definidas en el esquema aloestratigr¨¢fico propuesto para el ¨¢rea comprendida entre Playa San Carlos y Arroyo Chapadmalal. E
%K Lithofacies
%K Stratigraphy
%K Geomorphology
%K Pleistocene
%K Centinela del Mar
%K Buenos Aires
%K Argentina
%K Litofacies
%K Estratigraf¨ªa
%K Geomorfolog¨ªa
%K Pleistoceno
%K Centinela del Mar
%K Buenos Aires
%K Argentina
%U http://estudiosgeol.revistas.csic.es/index.php/estudiosgeol/article/view/817/848