Abstract
Integrated high-resolution biochemostratigraphy of the Schlamer #1 drill core, southern Illinois, USA;: marine redox cycling during the Ireviken and Mulde positive carbon isotope excursions
Abstracts with programs - Geological Society of America, Vol.48(7)
Geological Society of America, 2016 annual meeting & exposition
2016
Abstract
The Schlamer #1 Drill Core was recovered from Alexander County, Southwestern Illinois, and contains more than 250 feet of Silurian strata. Conodont and carbon isotope data demonstrate that the core spans an interval at least from the Hirnantian Stage through the Pridoli Series. At present more than 400 carbonate carbon isotope samples, 150 conodont samples, 1,200 pXRF data points, and 150 solution ICP-MS samples have already been completed and demonstrate that the core contains the Hirnantian, Ireviken, Mulde, and Lau positive carbon isotope delta (super 13) C (sub carb) excursions and associated biogeochemical events. As suggested by previous studies, significant increases in redox-sensitive elements occur at the onset of both the Ireviken and Mulde biogeochemical events that may have played important roles in the development of the ocean-atmosphere-biosphere system during the Wenlock Epoch. In particular, REE and redox-sensitive elemental abundance data from the Schlamer #1 Core show evidence of marine anoxia during the Ireviken and Mulde positive delta (super 13) C (sub carb) excursions. These findings provide support for a marine anoxia cause for the positive carbon isotope excursions of the Wenlock Epoch as opposed to their being the result of either carbonate weathering or diagenetic processes.
Details
- Title: Subtitle
- Integrated high-resolution biochemostratigraphy of the Schlamer #1 drill core, southern Illinois, USA;: marine redox cycling during the Ireviken and Mulde positive carbon isotope excursions
- Creators
- Bradley D Cramer - University of Iowa, Department of Earth and Environmental Sciences Iowa City, IA USA United StatesNeo E. B McAdamsAlyssa Marie BancroftTerryl L BandyJoseph Devera
- Resource Type
- Abstract
- Publication Details
- Abstracts with programs - Geological Society of America, Vol.48(7)
- Conference
- Geological Society of America, 2016 annual meeting & exposition
- Publisher
- Geological Society of America (GSA)
- ISSN
- 0016-7592
- Alternative title
- Geological Society of America, 2016 annual meeting & exposition
- Language
- English
- Date published
- 2016
- Academic Unit
- Earth and Environmental Sciences; International Programs; Office Of The Provost
- Record Identifier
- 9984240796302771
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