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LA-ICP-MS Zircon U-Pb Dating of the Bozhushan Granite in Southeastern Yunnan Province and Its Significance

CHENG Yan-bo1| MAO Jing-wen2| CHEN Xiao-lin3| LI Wei3   

  1. 1.School of the Earth Sciences and Resources|China University of Geosciences|Beijing 100083|China;
    2.Institute of Mineral Resources|Chinese Academy of Geological Sciences|Beijing |100037|China;
    3.No.2 Geological Party|Wenshan|Yunnan 663000|China
  • Received:2010-04-09 Online:2010-07-26 Published:2010-07-26

Abstract:

The LA-ICP-MS zircon U-Pb dating of three samples from the Bozhushan complex granite intrusion, in Southeastern Yunnan Province, constrains the emplacement age of the intrusion. The 206Pb-238U mean data of the sample CYB0808079 is （86.51 ±0.52） Ma and the MSWD value is 2.4, the sample CYB0808084 is （87.54 ±0.65） Ma and the MSWD value is 1.6, as well as the sample CYB0808079 is （87.83 ±0.89） Ma and the MSWD value is 0.15. These chronology data are consistent with the magmatism and mineralization in the area, and supply the reasonable isotopic age for the Bozhushan complex granite. It is demonstrated that the Bozhushan and other grantic intrusion as well as associated supergiant Gejiu, Dachang and Dulong tin-polymetallic deposits were formed during the Late Cretaceous period. Both the magmatism and large scale mineralization are the components of the western South China metallogenic belt in the Late Cretaceous period.

Key words: LA-ICP-MS, zircon U-Pb dating, granite, Bozhushan, southeastern Yunnan

CLC Number: 

  • P597
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