Classifying the reactivity of volcanic rocks from the Serra Geral Group: an approach using a proposed Reactivity Index (RI)
DOI:
https://doi.org/10.5380/bpg.v83i2.99861Resumen
The increasing global interest in CO₂ mineralization in basaltic rocks has led to studies within Large Igneous Provinces (LIPs), particularly focusing on their carbon storage potential. In South America, the Serra Geral Group (SGG), part of the Paraná-Etendeka Province, has been the subject of investigations due to its compositional diversity and extensive volcanic sequences. This study assesses the applicability of the Reactivity Index (RI) as a predictive tool for geochemical reactivity in six SGG volcanic rock samples, compared with two Icelandic basalts and one Columbia River Basalt (CRB). Results reveal RI values for SGG samples ranging from -11.1 to -6.7 log mol/s, aligning well with the observations from batch reactor experiments. Higher RI values were associated with increased reactivity, supporting the use of the index as a reliable proxy, especially in preliminary evaluations, although it does not account for textural characteristics or surface area variations. The samples from SGG, Icelandic, and CRB showed similar RI values. When integrated with petrography, surface area, and chemical data, the RI provides a promising tool for evaluating the reactivity of volcanic rocks in carbon storage strategies.
Citas
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