Caracterización de sedimentos terrígenos de la cuenca de Loja

Abstract

Abstract:The main objective of this work is to establish the possible formative tectonic environments of the terrific sediments of the Loja sedimentary basin through a compositional analysis, based on a detailed study of the chemical and mineralogical composition, as well as the statistical analysis of its various components. The sandstones were classified and the type of tectonic formation environment was established using thin sheets, with the help of the Pettijohn and Gazzi-Dickinson criteria and the results were contrasted by means of x-ray diffraction. The Trigal formation is mainly composed of feldspathic grauvacas deposited in a fluvial environment with origin of raised basement formation, the Bethlehem formation is formed by arches, feldspathic grauvacas to lithics deposited in a delta-fluvial environment and that come from areas of transitional arc with tendency A dissected arch, the San Cayetano formation is formed from litho-sandstone, sub-litho-sandstone, deposited in a lacustrine environment of transitional origin, the Quillollaco formation is composed of sub-rocky, litho-sandite, deposited in a fluvial environment and its origin is of a transitional-continental type.