Journal
SCIENCE CHINA-EARTH SCIENCES
Volume 54, Issue 3, Pages 372-379Publisher
SCIENCE PRESS
DOI: 10.1007/s11430-010-4145-2
Keywords
Early Triassic; Smithian-Spathian boundary; conodont; carbon isotopes; Chaohu; Anhui
Categories
Funding
- Ministry of Science and Technology [2006FY120300-11]
- National Natural Science Foundation of China [40830212, 40921062, 40972003]
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The West Pingdingshan Section in Chaohu, Anhui Province, has been extensively studied in recent years and become one of the classic Lower Triassic sequences well-clarified in multiple stratigraphies. Also it is an important section that defines the Smithian-Spathian (S-S) boundary within the Olenekian Stage. The S-S boundary strata at the section are restudied in high-resolution conodont biostratigraphy and carbon isotopes. The refined S-S boundary defined by the FAD of conodont Neospathodus pingdingshanensis is at 30 cm above the base of Bed 52, corresponding to a rapid diversification of conodonts. A sharp positive shift of delta C-13(carb) curve co-occurs at the S-S boundary and it can be used as a key reference to define the boundary. The defined S-S boundary position and carbon isotopes curve can be well correlated globally.
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