1887

Abstract

Summary

Carbon mineralisation is a geochemical trapping mechanism that can permanently store CO in the reactive silicate rocks. In this study, the carbon mineralisation potential of mafic rocks is investigated, examining the impact of their chemical and mineral heterogeneity on the process. For this purpose, high-pressure and temperature batch reaction experiments were conducted on olivine gabbro (OG) and picrite basalt (PB) samples, which were procured from the Deccan Traps. The carbon mineralisation efficiency was analysed by observing changes in mineral phases using X -ray diffraction, thermogravimetric analysis, total carbon analysis, and scanning electron microscopy. Magnesite was the dominant carbonate phase in OG, while PB consistently showed magnesian calcite and dolomite formation. The associated carbon mineralisation efficiencies for the best case were at ∼39%, and ∼11% for OG and PB respectively, under conditions of 185 °C, 50 bars of partial pressure of CO (pCO), and a 10-hour reaction time in an aqueous fluid with 2 M NaHCO and 0.1 M NaHEDTA•2HO. Higher mineralisation extents were strongly correlated with the presence of olivine and pyroxene. The study highlights the critical role of mineralogical composition in determining carbon mineralisation efficiency.

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2025-02-03
2026-02-06

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References

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/content/papers/10.3997/2214-4609.202570034
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Carbon Mineralisation Potential of Mafic rocks for Enhanced CO2 Sequestration
Conference Proceedings 2025, 1 (2025); https://doi.org/10.3997/2214-4609.202570034
/content/papers/10.3997/2214-4609.202570034
/content/papers/10.3997/2214-4609.202570034
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