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Mappable variations in the metallic ion concentration of late diagenetic carbonate cements at the surface above Velma oil field can be correlated to a qualitative measure of cathodoluminescence (CL). This proposed measure, the carbonate CL index or CCI, compares trace element quencher and activators of CL in carbonates to visual estimates of CL intensity.

The late diagenetic aureole at Velma is well developed. In surface sandstone, the aureole contains abundant Fe sulfides and associated ferroan carbonate cement which imparts a dark-reddish-brown color to the rock. The aureole is surrounded by Fe-poor sandstone. Prior studies of the Permian siliciclastic rocks...

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