Abstract
GEBELEIN and Hoffman1 drew attention to the association of dolomite with stromatolitic sequences, and suggested that the precipitation of dolomite is related to the presence of organic material. Their experiments confirmed previous results2,3 that large quantities of magnesium may be absorbed from seawater by organic material. Magnesium-rich algal filaments may form sites for the precipitation of high magnesium calcite with 17–20 mol % MgCO3 and although dolomite has not been precipitated in such conditions, it is possible that high-Mg calcite could be diagenetically altered to dolomite because of the high Mg–Ca ratio associated with the organic material1.
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References
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DAVIES, P., FERGUSON, J. & BUBELA, B. Dolomite and organic material. Nature 255, 472–474 (1975). https://doi.org/10.1038/255472a0
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DOI: https://doi.org/10.1038/255472a0
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