Evaluación de la fertilidad de sistema tipo pórfido y caracterización de alteraciones hidrotermales mediante el uso de elementos traza inmóviles en área ubicada en el suroriente ecuatoriano.

Abstract

Abstract: This research evaluates the magmatic fertility and characterizes the hydrothermal alterations of a porphyry-type prospect in the Jurassic metallogenic belt of southeastern Ecuador. To overcome the limitations of visual logging, multi-element lithogeochemistry and Compositional Data Analysis via logarithmic transformations were applied, mitigating statistical closure errors. The use of immobile elements allowed for the isolation of late intrusive pulses, such as monzonitic and dioritic porphyries, which intrude a granodiorite basement, in addition to volcanic rocks such as Dacites, Rhyolites, and Andesites. These phases demonstrated different adakitic Sr/Y signatures, formed at depths of 25 to 35 km. Their oxidation state, measured with a V/Sc ratio between 10 and 27.5, indicates the suppression of early sulfide precipitation, allowing the retention of metals of interest. Additionally, through various hydrothermal alteration classification techniques, alterations of interest were discriminated in an area that coincides with the highest fertility values obtained. It is concluded that lithogeochemical integration constitutes a useful predictive tool for vectoring toward the core of porphyry systems.