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Palaeomagnetic Study on the Precambrian‐Cambrian Boundary Candidate Stratotype Section at Meishucun, Yunnan

 

作者: Liang Qizhong,   Fang Wu,   Rob Van der Voo,  

 

期刊: Acta Geologica Sinica ‐ English Edition  (WILEY Available online 1991)
卷期: Volume 4, issue 1  

页码: 97-109

 

ISSN:1000-9515

 

年代: 1991

 

DOI:10.1111/j.1755-6724.1991.mp4001009.x

 

出版商: Geological Publishing House

 

数据来源: WILEY

 

摘要:

AbstractThe Meishucun secton has been recommended as an international candidate stratotype secton of the Precambrian‐Cambrian boundary. The paper deals with the palaeomagnetic study on the section. A total of 159 palaeomagnetic samples were successively collected from the platform‐facies sequence of carbonates and phosphates at the section. Thermal demagnetization results indicate a great majority of the rocks at the section have been strongly overprinted by recent magnetic field, but 57 samples have preserved remanent magnetization with antipodal directions (mean D /1 = 4.2 ° / 7.1 °, K= 9, α95= 6.6 ° ). Baaed on calculation, the location of the palaeomagnetic pole was at 68.8 ° N and 270.7 ° E, which is different from any palaeopoles obtained from younger Phanerozoic rocks in South China. The results reveal a polarity zonation which includes at least 9 reversal events. A comparison of China' s magnetostratigraphic records with those from Siberia, Australia and the western U.S.A. shows that all the sections are characterized by frequent polarity r

 

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