Basalts of the Arapey Group and their potential use as a source of agrominerals (stonemeal)

Abstract

The technique known as rochagem, stonemeal or rocks of crops consists of the addition of rock dust to increase the fertility conditions of the soil. In this paper, preliminary geochemical studies of the basalts of Los Catalanes Formation (Grupo Arapey) of three slag heaps are presented as a result of the disposal of mining activity in the Department of Artigas, and compared with successful use experiences of lithologies correlative to the region, specifically in the basalts of the Serra Geral Formation in the southern part of Brazil. The results obtained show SiO2, Al2O3 and Fe2O3 as the principal oxides, and in a smaller proportion, they are followed by CaO, MgO Na2O, TiO2, K2O and P2O5. The most noticeable differences are in the content of minor and trace elements such as Mn, Cr, As, Cd, Ba, Sr, V, Pb, Ti, Zn and Zr, possibly due to geochemical differences between streams. This study should be addressed in more detail in future works. In addition, the potential use of Los Catalanes Formation as an agromineral source and the development of the stonemeal technique in Uruguay are discussed. The possibility of using alternative inputs brings two productive activities, such as mining and agriculture, into dialogue, contributing to the sustainable development thereof.