Abstract
A suite of 40 Pennsylvanian and Permian shelf limestones from Kansas and Oklahoma has been analyzed for major and trace elements and for C, O and Sr isotopes. The chemistry and C and O isotope ratios were compared to the difference between the measured 87 Sr 86 Sr and original seawater ratio. Concentrations of Mn, Sr and Fe varied most systematically with the change in the seawater Sr ratio. All samples containing < 300 ppm Mn yielded correct ratios. All samples with > 700 ppm Mn yielded altered ratios. Fe and Sr contents were also found to have a less well-defined correlation with the retention of the original Sr ratio. All limestones with > 900 ppm Sr and 20 of 22 samples with a Sr Mn > 2.0 yielded correct ratios. The geochemical guidelines were applied to the chemical and isotopic results from 76 shelf limestones, mostly of Pennsylvanian age, from Texas and Oklahoma. More than 92% of the samples that contain < 300 ppm Mn, or with a Sr Mn > 2.0 yielded correct seawater ratios. Every sample with < 3000 ppm Fe and a Sr Mn > 2.0 retained the original seawater ratio.
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