Isotopic dating of the Chengjiang Fauna-bearing horizon in Central Yunnan Province, China
Chinese Journal of Geochemistry(2007)
摘要
Twenty black shale samples, which are free from the influence of weathering, were collected from the Chengjiang Fauna-bearing horizon, central Yunnan Province, yielding a Pb-Pb isochron age of 534±60 Ma. Although this age is younger than both the Rb-Sr isochron age and 40 Ar- 39 Ar age, it should represent the lower isotopic age limit of the Chengjiang Fauna.
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关键词
Chengjiang Fauna,lead isotope,isotopic dating,Yunnan Province
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