3D Resistivity Survey of a Weathering Profile of Metamorphic Rocks in State of Pernambuco, Brazil

Abstract

This paper aims to study a weathering profile of crystalline rocks in the City of Camaragibe, State of Pernambuco, Brazil. For this purpose, a survey using electroresistivity was conducted. A regular mesh was performed aiming at 3D acquisition. The target area of the survey has 3 meters of depth (the Data Collection Platform, abbreviated as PCD) responsible for recording soil moisture information. An auger soil sampler was also made reaching a depth of 3 meters to describe and identify the substrate. The main objectives of the paper are to determine the geoelectrical characteristics of the materials and relate them to the strata previously identified and the soil moisture profiles. A goal was also to calculate moisture from the resistivity model and compare the results with those obtained by the PCD. The results allowed the creation of 3D geo-electric models, extending to a depth of 8 meters. It was also possible to create a 3D soil moisture model. It was possible to make a correlation between the geoelectric horizons and the layers of the rock alteration profile. The humidity results obtained by PCD and the resistivity model were examined, indicating favorable prospects for applying the method.