150 bulk samples from two standard stratigraphic sections at the Precambrian/Cambrian boundary in Hubei and Yunnan provinces, China have been analyzed for carbon and oxygen isotopes. Investigations of the Precambrian/Cambrian boundary revealed that the boundary event left a signature in carbon and oxygen isotope anomaly. Report herein is the discovery of a sharp negative carbon and oxygen isotope shift in carbonates from a clay layer immedi-ately above a marker at the Precambriah /Cambrian boundary. This va...
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有关白至纪和第三纪,二叠纪和三叠纪边界之间的灾变事件,国内外已有很多学者作了详细研究。在全世界范围内,在上述边界之间都存在着一层1一Zcm厚的粘土层,在此粘土层中发现了铱和碳同位素的双异常(Aluarer ot al,1980;Hs位e,al,1982;徐道一等,一953;sun Yiyinge,al,198斗;Hs位e
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