Study of calcite cements in the Taum Sauk Limestone (Upper Cambrian, southeast Missouri) using cathodoluminescence petrography and microprobe analysis has shown that: 1) distinct luminescent zones correspond to distinct compositional zones; 2) the degree of luminescent intensity of a particular calcite zone appears to be controlled by the Fe/Mn ratio of the zone, not by the absolute concentrations of either cation; 3) manganese may induce luminescence in calcite at concentrations as low as 300 ppm; and 4) there may be no critical concentration of ferrous iron in calcite above which there can be no luminescene.

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