Toward high resolution isotope stratigraphy; Permian (super 87) Sr/ (super 86) Sr and delta (super 13) C stratigraphy from limestones in China and Nevada

Kate E Tierney; Matthew R Saltzman; Charles M Henderson; Vladimir I Davydov; Yan Jiaxin; Axel Munnecke; Bradley D Cramer

Abstract

Toward high resolution isotope stratigraphy; Permian (super 87) Sr/ (super 86) Sr and delta (super 13) C stratigraphy from limestones in China and Nevada

Kate E Tierney, Matthew R Saltzman, Charles M Henderson, Vladimir I Davydov, Yan Jiaxin, Axel Munnecke and Bradley D Cramer

Abstracts with programs - Geological Society of America, Vol.40(6), p.404

Geological Society of America, 2008 annual meeting

10/2008

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Abstract

Marine carbonate samples have been collected from the central Pequop Mountains, Nevada and the Tieqiao section, Laibin, China. The collected interval starts in the Gzhelian Stage of the Pennsylvanian and extends through the Wuchiapingian Stage of the Permian. These samples have been analyzed for carbon (delta (super 13) C) and strontium ( (super 87) Sr/ (super 86) Sr) isotopes as well as detailed biostratigraphy based on both foraminifers and conodonts. Both localities are characterized by continuous exposures of marine limestone each over a kilometer thick. Two sections were sampled from the Pequop Mountains, Nevada; 1) Ninemile Canyon from the Gzhelian Stage of the Pennsylvanian through the Sakmarian Stage of the Permian and 2) Rockland Ridge from the Sakmarian Stage through the Artinskian Stage. Ninemile Canyon has yielded delta (super 13) C (sub carb) values starting around 0ppm and culminating in a positive isotope excursion reaching almost +5ppm. This carbon isotope excursion has not previously been documented and likely coincides with the biotic change that occurs across the Sakmarian boundary. The (super 87) Sr/ (super 86) Sr data show a decreasing trend starting at 0.70825 in the Gzhelian and reaching low values in the Sakmarian of 0.70779. Rockland Ridge is still being analyzed. The Tieqiao section in Laibin, China begins in the Artinskian Stage of the Permian and continues through the Wuchiapingian Stage. The (super 87) Sr/ (super 86) Sr values start at approximately 0.70773 and continue the decreasing trend seen in the Central Pequop sections reaching an inflection point in the Roadian where the trend changes to more positive values. Integration of all of these geochemical trends with age constraints achieved by refined biostratigraphy will provide a high-resolution isotope stratigraphy for global correlation.

Asia

Biostratigraphy

China

Isotope Geochemistry

Stratigraphy

United States

alkaline earth metals

Artinskian

C-13/C-12

carbon

carbonate rocks

correlation

Elko County Nevada

Far East

high-resolution methods

isotope ratios

isotopes

Laibin China

limestone

Lower Permian

metals

Nevada

Paleozoic

Pequop Mountains

Permian

Rockland Ridge

Sakmarian

samples

sedimentary rocks

Sr-87/Sr-86

stable isotopes

strontium

Tieqiao China

Wuchiapingian

Details

Title: Subtitle: Toward high resolution isotope stratigraphy; Permian (super 87) Sr/ (super 86) Sr and delta (super 13) C stratigraphy from limestones in China and Nevada
Creators: Kate E Tierney - Ohio State University, Department of Geological Sciences Columbus, OH USA United States
Matthew R Saltzman
Charles M Henderson
Vladimir I Davydov
Yan Jiaxin
Axel Munnecke
Bradley D Cramer
Resource Type: Abstract
Publication Details: Abstracts with programs - Geological Society of America, Vol.40(6), p.404
Conference: Geological Society of America, 2008 annual meeting
Publisher: Geological Society of America (GSA)
ISSN: 0016-7592
Alternative title: Geological Society of America, 2008 annual meeting
Language: English
Date published: 10/2008
Academic Unit: Earth and Environmental Sciences; Office Of The Provost; International Programs
Record Identifier: 9984240909402771

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