Caracterización e interpretación geológico - estructural de las secuencias licotectónicas de la Coordillera Real entre las longitudes 78°34' y 78°30' O y las latitudes 1°40' y 1°50'S, al Este de Chambo, Provincia de Chimborazo

Abstract

The study area comprises basement metamorphic rocks and Pliocene-Quaternary volcanics that cover a wide area. Petrographic, structural and geomorphological analysis allowed to identify Jurassic and Cretaceous lithologic sequences. The geological mapping allowed to define new lithologies and discriminate the existing, controlled by structures and shear zones with Andean NNE strike, reflecting the dominant regional tectonic in the area. With the development and evolution of the Alao continental arc, important volcanic and sedimentary events are recorded and generated several lithologies that keep a relationship with each other for their common formation environment in this arc, which is constituted by the San Pablo de Sali volcaniclastic unit and by the Alao-Paute basaltic unit. These units form part of the arc basement. The Guamote unit is a pelitic sequence deposited along the forearc east of the Alao continental arc, accompanied by the Rio Daldal sedimentary unit deposited on the platform or near the continental slope. The Peltetec unit is the result of an exhumed basement suture zone, becoming an important structure that originated the main shear zone dominated by a west-thrusting dextral reverse faulting, causing uprisings and placing the regional main stress with an E-W direction.