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espanolEn la presente contribucion se realiza la descripcion e interpretacion de las microfacies carbonaticas de la Formacion San Juan (Ordovicico) en la seccion de Niquivil, considerando el intervalo estratigrafico comprendido entre las zonas de conodontos Oepikodus evae y Oepikodus intermedius. El analisis de las microfacies y los conodontos asociados permiten el reconocimiento de diferentes subambientes carbonaticos dentro de la rampa carbonatica desarrollada durante el Floiense tardio de la Precordillera Central. Se reconocieron cinco microfacies que, de base a techo, son: M1 Mudstone-Wackestone bioclastico; M2 Wackestone bioclastico-peloidal; M3 Wackestone intra-bioclastico; M4 Packstone intra-bioclastico; M5 Grainstone peloidal. La interpretacion vertical de estas microfacies indica una tendencia hacia la somerizacion de la rampa carbonatica en la seccion de Niquivil para el lapso temporal estudiado. El que se corresponderia con un ambiente de rampa media de baja energia sin efecto de accion de olas que evoluciona hacia a un ambiente de rampa media-interna, con mayor energia por accion de oleaje y desarrollo de tempestitas. EnglishThis contribution presents the description and interpretation of carbonate microfacies of the San Juan Formation (Ordovician) at the Niquivil section, considering the stratigraphical interval between the Oepikodus evae and Oepikodus intermedius conodont zones. The distribution of the microfacies and the conodonts assemblages allow us to identify different sub-environments within the late Floian carbonate ramp of the Central Precordillera. Five microfacies were recognized from the base to the top: M1 Bioclastic mudstone-wackestone; M2 Bioclastic-peloidal wackestone; M3 Intra-bioclastic wackestone; M4 Intra-bioclastic packstone; M5 Peloidal grainstone. The vertical distribution of these microfacies indicates a shallowing trend of the carbonate ramp in the Niquivil section for this temporal interval, which suggests a middle ramp environment with low energy, without wave action, and that evolved towards the middle-inner ramp environment with more energy by wave action and development of tempestites.

boletín geológico y minero/boletín geológico y minero

Microfacies carbonáticas de la Formación San Juan (Ordovícico: zonas de conodontos Oepikodus evae y Oepikodus intermedius), Niquivil, Precordillera Central, Provincia de San Juan (Argentina)