Abstract
In an Electron Spin Resonance (ESR) study of over 30 dolomites, representing a variety of probable sedimentary origins, we observed a Mg-site to Ca-site ratio in the Mn distribution that suggests two groups of dolomite. In one group the dolomites have a Mn distribution ratio near 5.0 and an excess of Ca; in the other group the dolomites are near-stoichiometric but have a Mn distribution ratio that varies from near 5 to near 70. We suggest that these two groups reflect different origins for the dolomites. The wide variation in the manganese distribution ratio for the near-stoichiometric dolomites supplies a parameter against which other variables can be plotted in studies of dolomite origin.
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