Caracterización microtectónica y microdeformaciones de la Unidad Chigüinda desde las latitudes 3°57'S a 04°12'S, de oriente a occidente al sur del Ecuador.

Abstract

Abstract: This work was developed in the Chigüinda metamorphic unit of the Cordillera Real in southern Ecuador, with the aim of characterizing the microstructures that are presented. The study was carried out through the road cuts of Zamora-Loja-Catamayo, and Loja-Malacatos that includes part of the Andean fragment in southern Ecuador. The structures developed and observed in the field correspond to a system of fold thrust belt and at regional level, the deformation style on a large scale that exposes the Cordillera Real in the southern zone and is a deformation system in duplex, with a sequence of flats and ramps that develop into pelitic rocks. The structures observed at the meso-structural level are isopaque or similar folding completely interfoliate with thickened and recrystallized nuclei, kink bands, sigma structures and SC structures in shear zones, chevron folds, Z and S microfolds type, and reverse faults that control the growth and deformation of the mountain range; and at the microstructures level in thin sections, porphyriaclasts with pressure shadows, sigma structures o, veins of recritalization, mineral lineaments are observed; on a crystalline the microtectonic indicators are domino-type fragmented porphyroclast and mechanical twinning. All these described structures are cataloged in a codified database that facilitates the collection of information of the structures in the studied area, besides being a contribution for later works. For this cataloging a worksheet was developed that covers the necessary information that must be collected in an outcrop to carry out a structural study and deformation zones.