![]() ![]() ![]() Rietveld refinements using X-ray diffraction data give modelled L vol–IB crystallite size values of <120 nm for all carbonates. In the fine-grained sediments of these lakes, very high magnesium calcite and magnesite occur as aggregate particles of nanocrystals (<100 nm). ![]() This study uses the preserved crystal sizes, morphologies and microstructures of Ca–Mg carbonates in the Coorong Lakes (Milne Lake, Pellet Lake and North Stromatolite Lake) to evaluate which crystallization pathway most likely occurred. Previously conducted laboratory studies demonstrate that carbonate minerals can precipitate via classical and non-classical crystallization pathways. Critically, today only a few modern environments remain where large quantities of very high magnesium calcite (VHMC Ca 0.5Mg 0.5CO 3 also described as protodolomite or disordered dolomite) and magnesite (MgCO 3) precipitate. The Coorong Lakes, South Australia, are one of the models for unravelling the ‘Dolomite Problem’. ![]()
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