Mapeamento geológico 1:5.000 e caracterização litogeoquímica para remineralizadores na região de Nazário-GO

Abstract

The intensive use of highly soluble chemical fertilizers (NPK) causes significant environmental impacts, proving the need to seek new alternatives to nourish the soil in less aggressive ways to the ecosystem. The use of rock dust to replenish nutrients to the substrate, known as rock dusting, is a technique that has stood out in recent years as a sustainable alternative to achieve this purpose. It can also be an option for properly disposing of mining waste. Normative Instruction No. 5 of March 10, 2016, from the Ministry of Agriculture, Livestock, and Supply (MAPA) stipulates that rocks efficient in replenishing nutrients to the substrate must meet certain criteria established by the agency. In recent years, the state of Goiás has become extremely relevant in the production of remineralizers. Keeping this in mind, DECAL – Derivados de Calcários Ltda contracted the services of Vila Rica Consultoria Mineral e Ambiental Ltda to conduct mineral research in the region of Nazário-GO, aiming to evaluate the potential of the region for the creation of a remineralizer product. The work includes field mapping, optical microscopy, chemical analyses using ICP-MS/OES (Inductively Coupled Plasma Mass Spectrometry), XRF (X-Ray Fluorescence), and SEM-EDS (Scanning Electron Microscopy with Energy Dispersive Spectroscopy) to perform quantitative and qualitative analysis of the lithologies of interest and studies of potentially toxic elements. As a complement to the field mapping, a geophysical survey of magnetic susceptibility was carried out to delineate and obtain more information about the geology of the work area. Based on the chemical analyses of the selected lithotypes, theoretical simulations were conducted to create a remineralizer compound composed of a blend of rock dust from various lithologies.