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Diagenesis of Lower Mississippian carbonates (Kinderhookian to Osagean) in northern Arkansas and southern Missouri
Cepero, Robert John
Cepero, Robert John
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[Fort Worth, TX] : Texas Christian University,
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2016
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Lower Mississippian carbonates in the North American midcontinent exhibit complex and extensive diagenetic histories. Previous diagenetic studies in the midcontinent have focused on individual formations or members of Lower Mississippian section. This study expands previous diagenetic studies to the entire Lower Mississippian sequence in northern Arkansas and southern Missouri, and offers explanations for the differences and similarities in diagenetic history between the St. Joe Limestone and Boone Formation. Data for this study includes 51 hand samples taken from outcrops throughout the Tri-State region. Standard petrographic techniques were used to document the timing of diagenetic events. XRF and XRD analyses were conducted to understand mineralogical and elemental changes related to diagenetic alteration, while carbon and oxygen isotope analyses allowed interpretations on the environments of precipitation of intermediate stage and late stage cements. Intermediate stage syntaxial cements could not have been precipitated in solely marine conditions and precipitation in meteoric conditions appears likely. Late stage sparite cements could have formed under burial or meteoric conditions, however, meteoric conditions appear most likely. Subaerial exposures from Chesterian-Atokan time may have played a role in the precipitation of carbonate cements, and may have also contributed to the stratigraphic variation in intensity and frequency of intermediate and late stage cementation.
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Geological Sciences