Estratigrafía, sedimentología y geoquímica de las formaciones Chapiza y Hollín en la Zona Subandina : Estratigrafía, sedimentología y geoquímica de la Formación Hollín en la Zona Subandina Subandina.

Abstract

This work was based on the use of geochemical tools such as chemostratigraphy and discriminating geochemical diagrams (lithogeochemistry), with the following applications: lithological classification, provenance, sediment composition, paleoredox environments, weathering indices, mineral association, differentiation of marine sediments and non-marines of the Hollin formation in the Sub-Andean zone of the Oriente Basin. The results of the lower member of Hollín formation reflected a predominance of non-marine quartz sandstones with an acidic to intermediate composition, without paleoredox environments, high weathering rates and with a mainly Andean contribution. On the other hand, the results for the upper member of the Hollín formation showed an important lithological variation with predominance in the field of non-marine shale and wackes with acidic to intermediate composition, which were affected by reducing conditions (paleoredox environments), low weathering rates and with a mainly cratonic contribution. The geochemical data collected in each of the lithofacies of the Hollín formation was compared with the data from studies by Mariño (2015) and Vallejo et al. (2021), in this way it was shown these studies are consistent with the results of this research.