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Chinese Journal of Geochemistry

, Volume 23, Issue 4, pp 342–348 | Cite as

40Ar−39Ar dating of quartz from ore in the baiyangping Cu−Co polymetallic ore-concentrated area, Lanping Basin, Yunnan

  • He Mingqin
  • Liu Jiajun
  • Li Chaoyang
  • Li Zhiming
  • Liu Yuping
  • Yang Aiping
  • Sang Haiqing
Article

Abstract

40Ar−39Ar fast neutron activation age spectrum of quartz in ore collected from the Baiyangping Cu−Co polymetallic ore-concentrated area, Lanping Basin, is saddle-shaped. The plateau age, minimum appearance age and isochron age shown on the spectra are 56.53±0.43 Ma, 55.52±1.78 Ma and 55.90±0.29 Ma respectively. The age data are consistent with each other within 1σ uncertainties. Because the given initial40Ar/36Ar value of 294.7±1.14 is very close to Nier's value (295.5±5), both plateau and isochron ages may be considered as the forming time of quartz. So the age of 55.90–56.53 Ma represents the forming age of ore deposits. It is obvious that the ore deposits were formed during the Early Himalayan period.

Key words

40Ar−39Ar dating Early Himalayan Cu−Co polymetallic ore-concentrated area Lanping West Yunnan 

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Copyright information

© Institute of Geochemistry, Chinese Academy of Sciences 2004

Authors and Affiliations

  • He Mingqin
    • 1
  • Liu Jiajun
    • 2
  • Li Chaoyang
    • 1
  • Li Zhiming
    • 1
  • Liu Yuping
    • 1
  • Yang Aiping
    • 3
  • Sang Haiqing
    • 4
  1. 1.Institute of GeochemistryChinese Academy of SciencesGuiyangChina
  2. 2.China University of GeosciencesBeijingChina
  3. 3.No. 3 Geological Party of Yunnan Bureau of Geology and Mineral ResourcesDaliChina
  4. 4.Institute of Geology and GeophysicsChinese Academy of SciencesBeijingChina

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