Análise geoquímica de solos na Ocorrência de Cobre Primavera, Caçapava do Sul – RS

Abstract

Caçapava do Sul city is part of the Cuprífera Province of the Escudo Sul-rio-grandense, in which there are several base metal occurrences distributed in the region. Thus, the study aimed to determine the geochemical characteristics of the soils around the Cobre Primavera Occurrence located 10 km south of the city of Caçapava do Sul. Considering that it is an important area with good exposures of metamorphic rocks with clear evidence of surface mineralization, it sought to understand the pedogenetic processes acting in the area, the mobility of chemical elements, and the correlation of the local geology with the soils. Seventeen soil samples were collected and analyzed using the Energy Dispersive X-Ray Fluorescence Spectrometry (EDXRF) method. It was possible to observe high concentrations of Mg, Al, P, K, Ca, Ti, Fe, Mn, Co, Mo, Ce and Hf throughout the study area. Allowing the understanding that these values correspond to a chemical composition coming from the basic metavolcanic rocks in the region. The elements of greater economic interest, such as Cu and Zn, presented only four points with contents above zero, and this is related to the high mobility of these elements in the environment. From the isotheor maps it was possible to evidence the geochemical affinity between the elements, as was predicted by observing the correlations between them. It was also possible to visualize that the elements have a northwest concentration in relation to their main area of influence on the ground, and this behavior is linked to the topography of the area.