18: Isotope Chemostratigraphy of the Lower Mississippian St. Joe Group in Northeastern Oklahoma and Southwestern Missouri
Published:January 01, 2019
Julia P. S. Sessions, Christina L. Opfer, Robert W. Scott, 2019. "Isotope Chemostratigraphy of the Lower Mississippian St. Joe Group in Northeastern Oklahoma and Southwestern Missouri", Mississippian Reservoirs of the Midcontinent, G. Michael Grammer, Jay M. Gregg, James Puckette, Priyank Jaiswal, S. J. Mazzullo, Matthew J. Pranter, Robert H. Goldstein
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The St. Joe group (Lower Mississippian, Tournaisian) is petrographically and isotopically analyzed using δ13C and δ18O bulk sample stable isotopes in central, northeastern Oklahoma, and southwestern Missouri. Determined to be conformable in Oklahoma, this group represents deposition in the mid- to outer-ramp setting during one long-term depositional cycle and can be used as a reference section for geochemical chronostratigraphy. Minor diagenetic alteration did not overprint the initial isotope signal, and the resulting curve is similar to those from previous studies and is integrated with published conodont biostratigraphy. The resulting correlation indicates that the St. Joe group was deposited in the upper Tournaisian Stage.