Abstract
Depositional build-and-fill within the Zarah Subgroup (Upper Pennsylvanian, Missourian stage) of Miami County, Kansas; integrated lithostratigraphy, biostratigraphy, delta (super 13) c (sub carb) chemostratigraphy, and geophysical well-log data
Abstracts with programs - Geological Society of America, Vol.47(7), p.652
Geological Society of America, 2015 annual meeting & exposition
2015
Abstract
Surface and subsurface analysis of units within the Zarah Subgroup of Miami County reveal extensive distal-delta lobe development with variable thicknesses up to 16.5 meters of the Liberty Memorial Shale Formation, and 17.1 meters and 31.7 meters respectively of the Island Creek and middle Farley shale members. The relief developed by these near-shore deposits promoted the aggradation and progradation of photic-zone algal mounds with thicknesses of greater than 14.6 meters on and around bathymetric highs, resulting in a dynamic interplay between carbonate build-up, and siliciclastic infilling, modulated by glacioeustatic sea level rise and fall. This dynamic system has been described as "build-and-fill" and is applied to the Zarah Subgroup as a means of predicting algal mound development and distribution. This high-resolution study is presented here in a sequence-stratigraphic framework, and improves upon past interpretations of the mound-bank paleotopography and our understanding of the Missourian depositional systems within the study area. This study also provides the first whole-rock carbonate carbon isotope delta (super 13) C (sub carb) chemostratigraphic data from Missourian rocks in this region, which show elevated delta (super 13) C values in association with carbonate and core shale lithologies with shifts of up to +6.0 ppm (total change) for delta (super 13) C. These data show a similar pattern to that observed in the Permian of south-central Kansas, and has been attributed to glacial-interglacial cyclicity during the Late Paleozoic Ice Age. This study also provides updated conodont biostratigraphic information for the Kansas City Group.
Details
- Title: Subtitle
- Depositional build-and-fill within the Zarah Subgroup (Upper Pennsylvanian, Missourian stage) of Miami County, Kansas; integrated lithostratigraphy, biostratigraphy, delta (super 13) c (sub carb) chemostratigraphy, and geophysical well-log data
- Creators
- Stephan C Oborny - University of Iowa, Department of Earth and Environmental Sciences Iowa City, IA USA United StatesGreg A LudvigsonRobert HenthornePhilip H HeckelBradley D Cramer
- Resource Type
- Abstract
- Publication Details
- Abstracts with programs - Geological Society of America, Vol.47(7), p.652
- Conference
- Geological Society of America, 2015 annual meeting & exposition
- Publisher
- Geological Society of America (GSA)
- ISSN
- 0016-7592
- Alternative title
- Geological Society of America, 2015 annual meeting & exposition
- Language
- English
- Date published
- 2015
- Academic Unit
- Earth and Environmental Sciences; International Programs; Office Of The Provost
- Record Identifier
- 9984240886002771
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