Title

Detrital zircon geochronology of Paleozoic to Late Cretaceous siliciclastic strata of the Ozark Dome, Southern Missouri

Presenter Information

Jing Hua

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

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Apr 15th, 9:00 AM Apr 15th, 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.