Detrital zircon geochronology of Paleozoic to Late Cretaceous siliciclastic strata of the Ozark Dome, Southern Missouri
Department
Geosciences and Geological and Petroleum Engineering
Major
Geology and Geophysics
Research Advisor
Chapman, Alan D.
Advisor's Department
Geosciences and Geological and Petroleum Engineering
Funding Source
Dr. Chapman’s startup funding
Abstract
Siliciclastic strata exposed in the Ozark Dome provide Late Cambrian to Late Cretaceous snapshots of an evolving paleogeography and regional to far-field tectonic events. Detrital zircon geochronology in the Ozark Dome reflects an evolving depositional environment involving two significant provenance shifts:
- 1) a Cambrian–Ordovician shift from local basement- to Superior Province-derived detritus, attributed to the rise in base level associated with the Sauk transgression and/or the inversion of Proterozoic basins perched on Superior Province and midcontinent rift basement at the onset of the Taconic orogeny.
- 2) an Ordovician–Devonian shift to detritus sourced from the emerging Appalachian Mountains to the east. Westward transport of clastic sediment originating from the Appalachian highlands continued sporadically until at least Late Cretaceous time.
Additionally, the originally assigned “Pennsylvanian sink fill” in the Ordovician Gasconade Dolomite is reinterpreted here as Ordovician in age on the basis of petrographic and detrital zircon age similarities between this unit and the St. Peter Sandstone and cross cutting relationship with the surrounding strata.
Biography
Jing Hua is a senior student who is interested in detrital zircon geochronology. She won the Spreng research award last semester which supports her to attend 2015 GSA section meeting. Jing’s abstract has just been accepted by GSA and is published in GSA Abstracts with Programs Vol. 47, No. 1.
Research Category
Sciences
Presentation Type
Poster Presentation
Document Type
Poster
Location
Upper Atrium/Hall
Presentation Date
15 Apr 2015, 9:00 am - 11:45 am
Detrital zircon geochronology of Paleozoic to Late Cretaceous siliciclastic strata of the Ozark Dome, Southern Missouri
Upper Atrium/Hall
Siliciclastic strata exposed in the Ozark Dome provide Late Cambrian to Late Cretaceous snapshots of an evolving paleogeography and regional to far-field tectonic events. Detrital zircon geochronology in the Ozark Dome reflects an evolving depositional environment involving two significant provenance shifts:
- 1) a Cambrian–Ordovician shift from local basement- to Superior Province-derived detritus, attributed to the rise in base level associated with the Sauk transgression and/or the inversion of Proterozoic basins perched on Superior Province and midcontinent rift basement at the onset of the Taconic orogeny.
- 2) an Ordovician–Devonian shift to detritus sourced from the emerging Appalachian Mountains to the east. Westward transport of clastic sediment originating from the Appalachian highlands continued sporadically until at least Late Cretaceous time.
Additionally, the originally assigned “Pennsylvanian sink fill” in the Ordovician Gasconade Dolomite is reinterpreted here as Ordovician in age on the basis of petrographic and detrital zircon age similarities between this unit and the St. Peter Sandstone and cross cutting relationship with the surrounding strata.
