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Mafic rocks might present a high potential for permanent carbon storage through CO2 mineralization. The main reason for that is the abundance of reactive minerals in their composition. However, the mineral composition can significantly vary spatially within an igneous interval and from one geologic site to another. Here, we quantify the impact of rock composition, regarding the mafic minerals, on the long-term field-scale CO2 entrapment. The results point out relevant differences in the efficiency of mineral trapping, even in the short term, considering a timeframe of 30 years.