Dolomite stoichiometry and Ostwald's Step Rule
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A DOM regulation model for dolomite versus calcite precipitation in the Ediacaran ocean: Implications for the “dolomite problem”
2023, Precambrian ResearchCitation Excerpt :% MgCO3, including disordered dolomite and protodolomite) (Gregg et al., 2015; Fang and Xu, 2019; Fang et al., 2022). Many primary carbonate minerals are metastable phases, with high-Mg calcite (and aragonite) transforming to low-Mg calcite and disordered dolomite and protodolomite to ordered dolomite during burial diagenesis (Tucker and Wright, 1990; Burton, 1993; Nordeng and Sibley, 1994; Gregg et al., 2015; Pina et al., 2022), resulting in carbonate rocks in deep-time systems being composed mainly or exclusively of low-Mg calcite and ordered dolomite. For the sake of simplicity, primary low-Mg calcite and high-Mg calcite are collectively referred to as “calcite” in samples, and primary disordered dolomite and protodolomite as “dolomite” in samples.
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