Conference proceeding
Sr isotope stratigraphy of the Early Permian Cisuralian Epoch (Artinskian-Kungurian stages) from Laibin, China
Abstracts: Annual Meeting - American Association of Petroleum Geologists, Vol.2008
AAPG 2008 annual convention & exhibition
2008
Abstract
Carbonate samples have been analyzed for (super 87) Sr/ (super 86) Sr from the Tieqaio section at Laibin, China. The section analyzed spans the Artinskian (pamrinia and tschernyschewi fusulinids) through Kungurian Misellina claudiae fusulinid zone. Laibin is thick and well constrained by fusulinids, with conodont samples currently being processed that will further increase the potential for intercontinental correlations. The (super 87) Sr/ (super 86) Sr values fall steadily from 0.707668 in the Artinskian to 0.707371 in the Kungurian. The decreasing trend is consistent with the overall Permian (Cisuralia-Guadalupian) drop in the curve of Korte et al (2006), and data through the mid-Sakmarian reported by Needham et al (2006). Korte et al. (2006), however, show a considerable spread of values for the Kungurian, which they consider "bad" brachiopod data due to stratigraphic uncertainty. Thus, our new data resolve the Sr isotope trend for a key gap in the "good" data of Korte et al (2006; Figure 4). Sr concentrations in our samples range from 150 to 1200 ppm, with an average of 550 ppm. Korte et al (2006) considered samples with greater than 400 ppm Sr as well preserved ("good"). Furthermore, Korte et al analyzed a brachiopod from the Laibin section (sample ch33), which is at precisely the same level from which one of our samples was analyzed. The difference in Sr isotope values between their brachiopod sample and our micritic limestone is 0.000003 (0.707368 vs. 0.707371). The overall Sr isotope drop in the Permian (Cisuralia-Guadalupian) has been attributed to increased continental aridity and a diminishing riverine flux of radiogenic strontium to the oceans. This is consistent with lithologic evidence, including evaporite deposits and red beds. At the same time, the glaciation in the Southern Hemisphere was weakening, and the Neotethys was opening which could also contribute non-radiogenic Sr.
Details
- Title: Subtitle
- Sr isotope stratigraphy of the Early Permian Cisuralian Epoch (Artinskian-Kungurian stages) from Laibin, China
- Creators
- Kate Tierney - Ohio State University Columbus, OH USA United StatesMatthew SaltzmanYan JiaxinKenneth A FolandJeff LinderAxel MunneckeBradley D Cramer
- Resource Type
- Conference proceeding
- Publication Details
- Abstracts: Annual Meeting - American Association of Petroleum Geologists, Vol.2008
- Conference
- AAPG 2008 annual convention & exhibition
- Publisher
- American Association of Petroleum Geologists and Society for Sedimentary Geology
- Alternative title
- 2008 AAPG annual convention & exhibition; abstracts volume
- Language
- English
- Date published
- 2008
- Academic Unit
- Earth and Environmental Sciences; Office Of The Provost; International Programs
- Record Identifier
- 9984240806502771
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