Determinación del origen y las características del Lahar "Tena", Provincia de Napo : Mapeo y descripciones de la estratigrafía del Lahar “Tena”, comparación con la geoquímica de las bombas y de posibles fuentes volcánicas y realizar un estudio de las láminas delgadas.

Abstract

Lahars are dense flows that move by gravity down the quebradas of a volcano and consist of a mixture of water (liquid phase) and loose volcanic materials (solid phase) such as large rocks, sand, ash and even tree trunks that can be dragged by the flow. Volcanic materials may come from an ongoing eruption and/or previous eruptions, while water may originate directly from partial melting of the ice cap during the eruption or from heavy rainfall over the volcano. The magnitude and destructive potential of these flows depends on the volume contained in the two phases, as well as the size of the solid particles that can vary between fine sand and rocks of a few meters in diameter. In this document the mapping, the descriptions of the stratigraphy and lithology of the lahar "Tena" found along the beds of the Misahualli, Pano and Tena rivers, the comparison with the geochemistry of both major elements and trace elements of the juvenile bombs extracted from the lahar with the geochemical data of possible parent volcanoes (Sumaco and Sierra Azul volcanos) is carried out. The determination of the possible volcanic source of the Lahar, the determination of the age of the lahar by radiometric analysis of the organic material extracted from the lahar matrix, and the study of thin sections and related rocks to know their textures and mineralogical compositions and correlations, were all undertaken.