Correlación de las formaciones Agoyán y Tres Lagunas en la vía Cucanamá Tumianuma

Abstract

Abstract: This work focuses on the correlation of the Agoyán and Tres Lagunas formations, in the sector Cucanamá Tumianuma of the Vilcabamba parish in the province of Loja. The IGEM In 2017, Gonzanamá 1:1000,000 geological map was published, showing the terrain from the Loja Division, Chigüinda Unit and Tres Lagunas Formation; however, it is not identifies the Agoyán Formation for which this study is proposed. The methodology was developed in four phases; initial information gathering phase; field work phase interpretation and survey scale 1:25,000, description of rocks and sampling; laboratory work phase geochemical tests and petrographic; final phase of cabinet development of technical report. The results showed the presence of chlorite in the geochemical tests, biotite, chlorite and albite in thin sheets demonstrating the presence of green schists of the Agoyán Formation. In the Tres Lagunas Formation, albite was evident in the tests geochemical and thin slices of muscovite, biotite and quartz. The Chigüinda Unit declared biotite in the geochemical tests and in thin section albite and quartz.