Acceleration of dolomitization by zinc in saline waters

Veerle Vandeginste (), Oliver Snell, Matthew R. Hall, Elisabeth Steer and Arne Vandeginste
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Veerle Vandeginste: University of Nottingham
Oliver Snell: University of Nottingham
Matthew R. Hall: GeoEnergy Research Centre, University of Nottingham
Elisabeth Steer: Nano- and Microscale Research Centre, University of Nottingham
Arne Vandeginste: Camco Technologies, Haasrode Research Park 1040

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Dolomite (CaMg(CO3)2) plays a key role in the global carbon cycle. Yet, the chemical mechanisms that catalyze its formation remain an enigma. Here, using batch reactor experiments, we demonstrate an unexpected acceleration of dolomite formation by zinc in saline fluids, reflecting a not uncommon spatial association of dolomite with Mississippi Valley-type ores. The acceleration correlates with dissolved zinc concentration, irrespective of the zinc source tested (ZnCl2 and ZnO). Moreover, the addition of dissolved zinc counteracts the inhibiting effect of dissolved sulfate on dolomite formation. Integration with previous studies enables us to develop an understanding of the dolomitization pathway. Our findings suggest that the fluids’ high ionic strength and zinc complexation facilitate magnesium ion dehydration, resulting in a dramatic decrease in induction time. This study establishes a previously unrecognized role of zinc in dolomite formation, and may help explain the changes in dolomite abundance through geological time.

Date: 2019
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DOI: 10.1038/s41467-019-09870-y

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