ARQUITECTURA ALUVIAL DE DEPÓSITOS PIROCLÁSTICOS RETRABAJADOS EN CUENCAS PERI-VOLCÁNICAS:FORMACIÓN CASTILLO (ALBIANO) DE LA CUENCA DEL GOLFO SAN JORGE, ARGENTINA

José M. Paredes, Nicolás foix, José O. Allard, Ferrán Colombo, Maisa A. Tunik

Resumen


La distribución espacial de litofacies y asociaciones de litofacies es primordial para entender las variaciones en los estilos fluviales y dimensiones de los canales, los controles externos y el grado de predictibilidad de la arquitectura aluvial de depósitos piroclásticos retrabajados en cuencas peri-volcánicas. Estos aspectos se analizan en este estudio sobre la Formación Castillo (Albiano) de la cuenca del Golfo San Jorge en la Faja Plegada de San Bernardo, un grupo de sierras con orientación N-S, ubicadas 190 km al este de la Cordillera de los Andes. Se conformó un marco estratigráfico detallado basado en 19 secciones estratigráficas y la caracterización de 284 canales fluviales, analizando siete localidades desde el margen norte de la cuenca, a la sección más completa en el extremo sur de la faja plegada. La unidad se dividió en quince litofacies, agrupadas en seis asociaciones de litofacies: (i) planicies de inundación subaérea y subácuea, (ii) planicie proximal, (iii) canales fluviales de baja sinuosidad y entrelazados, (iv) depósitos de flujos de detritos, (v) flujos no encauzados, (vi) niveles de ceniza retrabajada. Las variaciones en la proporción de asociaciones de litofacies y en las dimensiones de los depósitos clásticos están relacionadas a aporte variable de agua y partículas volcaniclásticas en redes de drenaje locales o regionales desarrolladas en areas de variable tasa de subsidencia. Pese al control del volcanismo sobre la composición de los depósitos volcaniclásticos, los rasgos característicos del sistema fluvial preservado en esta cuenca peri-volcánica fueron mayormente establecidos por procesos intracuencales.


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