Abstract

MOYA, María Cristina. La "Fase Oclóyica"(Ordovícico Superior) en el noroeste argentino. Interpretación histórica y evidencias en contrario. Ser. correl. geol. [online]. 2015, vol.31, n.1. ISSN 1666-9479.

The conceptual framework in which was def-ned the "Ocloyic Phase" in the Argentine Northwestern is discussed. This conceptual framework was modifed not only by the introduction of new concepts contributed by plate tectonics and sequence stratigraphy, but by the increasing radiometric and biostratigraphic information, which allowed to adjust the age of the major geological events that occurred during the lower Paleozoic in this region. The discussion begins with an analysis of the unconformity that marks the top of the Santa Victoria Group (Upper Furongian - Upper Ordovician), whose genesis was attributed to the "Ocloyic Phase" tectonism, event that was traditionally considered responsible for the folding of the Ordovician deposits in northern Argentina. Evidences that contradict this interpretation are shown and alternative hypotheses are provided about the deformation times of the Ordovician sequences in the region.

Keywords : Argentine Northwestern; Tectonic phases; Ocloyic Phase. Paleozoic orogenies..

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