Análisis morfo-estructural de la falla Las Pitas del borde ENE de la cuenca de Loja, mediante la integración de datos geofísicos (gravimetría yo TRE) y geológicos de superficie.

Abstract

Abstract:This work characterizes the extension and take-off of the Las Pitas fault on the ENE edge of the Loja basin, through the integration of geophysical and geological interpretations. The geological interpretation on the ENE edge consists of a sequence of filitas, quartzites and schist, with scales of metavolcanic sediments forming the base, and a sequence of lutitas, sandstones, limolites, limestones, and fan-alluvial deposits as a sedimentary filling. Metamorphic and sedimentary rocks have geomorphological features that correspond to the most prominent areas affected by failures; sedimentary rocks have hilly reliefs and small valleys, metamorphic rocks present undulated plain reliefs with long depressions and narrow V valleys. In the 2D models of TRE and microgravimetry it has been determined that the metamorphic sequences were raised by a compressive system in the E-W direction that suffered the basin, the Las Pitas fault being evidence of the structural control of tectonic events Regional. In addition, the metamorphic base is covering metavolcanic scales that are outof a compression duplex type system caused by low-angle horseback riding failures.