Abstract
The expansion of reduced environments during the Ireviken biogeochemical event; new Delta (super 34) S data across the Llandovery-Wenlock boundary of Gotland, Sweden
Abstracts with programs - Geological Society of America, Vol.54(5)
Geological Society of America, 2022 annual meeting; GSA connects 2022
10/2022
DOI: 10.1130/abs/2022AM-383112
Abstract
The Ireviken Biogeochemical Event (IBE) is one of several major biogeochemical events in the Silurian and occurs across the Llandovery-Wenlock boundary. This event consists of a major positive carbon isotope excursion, increased biotic turnover, and significant perturbations within other biogeochemical cycles, such as sulfur. More recently the IBE has been hypothesized to coincide with the expansion of reducing marine conditions which allowed for a global increase in organic carbon burial rates, and lead to the Ireviken positive carbon isotope excursion. One of the highest resolution carbon isotope datasets through this interval is in the Altajme core from Gotland, Sweden which offers an exceptionally well preserved and expanded stratigraphic section. New Sulfur isotopic data including delta (super 34) S (sub pyr) (pyrite) and delta (super 34) S (sub CAS) (carbonate-associated sulfate) from the Altajme core are indicative of a local signal of increased microbial sulfate reduction (MSR). The delta (super 34) S (sub pyr) signal provides evidence for a local expansion of reducing marine environments coincident with the IBE and when combined with data from the Baltic and distant basins the delta (super 34) S (sub CAS) data from this study may suggest a global expansion of reduced marine environments.
Details
- Title: Subtitle
- The expansion of reduced environments during the Ireviken biogeochemical event; new Delta (super 34) S data across the Llandovery-Wenlock boundary of Gotland, Sweden
- Creators
- Brittany Stolfus - University of IowaLindsi AllmanSeth YoungMikael CalnerEmma HartkeStephan ObornyAlyssa M. BancroftBradley Cramer
- Resource Type
- Abstract
- Publication Details
- Abstracts with programs - Geological Society of America, Vol.54(5)
- Conference
- Geological Society of America, 2022 annual meeting; GSA connects 2022
- Publisher
- Geological Society of America (GSA)
- DOI
- 10.1130/abs/2022AM-383112
- ISSN
- 0016-7592
- Alternative title
- Geological Society of America, 2022 annual meeting; GSA connects 2022
- Language
- English
- Date published
- 10/2022
- Academic Unit
- Earth and Environmental Sciences; Iowa Geological Survey; IIHR--Hydroscience and Engineering; International Programs
- Record Identifier
- 9984701800102771
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