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Chinese Science Bulletin

, Volume 43, Issue 15, pp 1289–1294 | Cite as

Single-zircon dating of Precambrian strata in the west sector of the northern Qilian Mountains and its geological significance

  • Jingwen Mao
  • Zhaochong Zhang
  • Jianmin Yang
  • Biao Song
  • Maobing Wu
  • Guochao Zuo
Bulletin

Abstract

Single-zircon evaporation method was employed in the present study to determine the age of the iron-bearing rock series in Precambrian strata in the western sector of the northern Qilian Mountains. Three zircon ages from the diabase of the Aoyougou ophiolite previously put into Upper Lithologic Formation of the Zhulongguan Group are (1 840 ± 2), (1 783 ± 2) and (1 784 ± 2) Ma respectively, whereas the zircon ages from the welded breccias in the Zhulongguan Group are (733 ± 71, (738 ± 4) and (604 ± 6) Ma respectively. These results show that they should belong to the bottom of the middle Proterozoic and the upper part of upper Proterozoic respectively.

Keywords

single-zircon dating Proterozoic stratigraphic division 

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Copyright information

© Science in China Press 1998

Authors and Affiliations

  • Jingwen Mao
    • 1
  • Zhaochong Zhang
    • 2
  • Jianmin Yang
    • 1
  • Biao Song
    • 2
  • Maobing Wu
    • 3
  • Guochao Zuo
    • 3
  1. 1.Institute of Mineral DepositsChinese Academy of Geological SciencesBeijingChina
  2. 2.Institute of GeologyChinese Academy of Geological SciencesBeijingChina
  3. 3.Institute of Geological SciencesGansu Bureau of Geology and Mineral ResourcesLanzhouChina

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