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- W87120218 abstract "Mineralogic variation in modern ooids is thought to be controlled mainly by short-term changes in the chemistry of the precipitating fluid. Other research documents large fluctuations in atmospheric pCO2 and changes in the mineralogy of tropical-marine carbonate sediments in relation to Pleistocene glacial/interglacial cycles. Glacio-eustatic control is generally inferred for transgressive/regressive carbonate cycles of Late Pennsylvanian age. The authors are investigating changes in ooid mineralogy in Late Pennsylvanian carbonates of the Midcontinent area that may provide a record of changing atmospheric and oceanic chemistry at this time. This study employs petrographic and geochemical techniques for inferring original carbonate mineralogy to document dominant primary mineralogies of ooids in transgressive and regressive limestone in the Missourian Series in southeastern Kansas. Enrichment of strontium in aragonite relative to calcite provides a trace-elemental indicator of primary mineralogies. Microprobe analyses of ooids with tangential fabrics show enrichment in strontium while strontium in ooids with radial fabrics is at lower levels. Investigation thus far suggests that originally aragonitic ooids having a tangential fabric are commonly associated with regressive units whereas originally calcitic ooids with radial fabric are more common in transgressive units. Changes in ooid mineralogy within and between transgressive/regressive limestones may allow semi-quantitative interpretation ofmore » changes in paleo-atmospheric and paleo-oceanic CO2 levels based on mineralogy.« less" @default.
- W87120218 created "2016-06-24" @default.
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- W87120218 date "1994-03-01" @default.
- W87120218 modified "2023-09-26" @default.
- W87120218 title "Bimineralic ooids as a record of Late Paleozoic changes in atmospheric and oceanic chemistry" @default.
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