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Research on the isotopic age of the Sinian–Cambrian boundary at the Meishucun section in Jinning County, Yunnan Province, China

Published online by Cambridge University Press:  01 May 2009

Xue Xiaofeng
Xue Xiaofeng
Affiliation:
Yunnan Institute of Geological Sciences, Kunming, Yunnan, China
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Abstract

In this paper the author describes the results of the Rb-Sr isotopic dating of black shale at the Sinian (Precambrian)–Cambrian boundary at the Meishucun section, Jinning County, Yunnan Province, China. The Sinian and Cambrian strata in eastern Yunnan are well developed, the Sinian–Cambrian boundary section in the vicinity of Meishucun Village in Jinning County being representative. These well developed strata provide excellent conditions for research on the radiometric age of the Precambrian–Cambrian boundary. An Rb-Sr isochron age of 579.7 ±8.2 Ma has been obtained on black shale from the Badaowan Member of the Early Cambrian Qiongzhusi Formation, which occurs at 20 m above the Sinian–Cambrian boundary. So an inferred age of 610±10 Ma is given for the Sinian (Precambrian)–Cambrian boundary.

Type
Articles
Information
Geological Magazine , Volume 121 , Issue 3 , May 1984 , pp. 171 - 173
Copyright
Copyright © Cambridge University Press 1984

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References

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