Speaker
Description
To abate the effects of global climate disruption, removal and storage of atmospheric CO2 will be paramount to decrease the greenhouse effect. Subsurface carbon mineralization in mafic-ultramafic rocks has been demonstrated to permanently store injected CO2 as carbonate minerals. Ultramafic rocks, have typically higher reactive storage potential compared to their mafic counterparts, yet lack extensive pore and fracture volume for injection. These reservoirs can also have potential applications for geologic hydrogen generation and critical mineral mobilization during carbonation. Thus, increasing reactive surface area is paramount to access the vast reactive potential of these reservoirs. In this study, we performed elevated temperature and pressure reactions with CO2, meant to mimic geologic conditions, on coarse grain olivine peridotite cubes from the Tamarack Intrusive Complex in northern Minnesota, USA, provided Talon Metals. Samples reacted in both aqueous CO2 and supercritical CO2 and with and without organic ligand additives, showed extensive carbonation and fracturing across grain boundaries. The carbonation products were analyzed via micro-X-ray diffraction and SEM-EDS and fracture networks were mapped with X-ray microtomography, showing a significant increase in reactive surface area, with carbonation occurring in fractures.
| Country | United States |
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