2019/04/23 by Veerle Vandeginste, Oliver Snell, Matthew R. Hall +2 · 2 citations
Earth and Planetary Sciences · Environmental Science · Chemistry · #Geochemistry and Elemental Analysis #Paleontology and Stratigraphy of Fossils #Mine drainage and remediation techniques #Dolomite #Dolomitization #Zinc #Magnesium #Gypsum #Chemistry #Carbonate #Inorganic chemistry #Mineralogy #Geology #Paleontology
paper · pdf · doi:10.1038/s41467-019-09870-y
openalex publication_date 2019/04/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/23
Abstract Dolomite (CaMg(CO 3 ) 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 (ZnCl 2 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.