Caracterización quimioestratigráfica de las capas enriquecidas en vanadio en el polígono 2 del sector La Sota, cantón Puyango, provincia de Loja

Abstract

Abstract: The present work aims to carry out the chemostratigraphic characterization of the vanadium (V) enriched layers in polygon 2 of the La Sota sector, Puyango canton, Loja province, in order to establish their formation environment. Once the proposed methodology has been applied, two members were identified, the lower member consisting of an intercalation between layers of bituminous limestone and brown calcareous shales and the upper member consisting mostly of powerful layers of massive bituminous limestone which present the highest concentrations of vanadium in the area (min = 475 ppm; max = 2240; average = 1385 ppm), in addition, within the study area, it was possible to identify anomalies of uranium (195 ppm) and zinc (1398 ppm). The V / (V + Ni) ratio of the upper limb (min = 0.82; max = 0.97; mean = 0.93) indicates that this member was deposited under anoxic sulfidic (euxinic) conditions, which favored the preservation of organic compounds in which vanadium was adsorbed, similarly, concentrations of Cd (min = 2 ppm; max = 69 ppm) and Mo (min = 6 ppm; max = 161 ppm) indicate an anoxic environment.