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Geoscience ›› 2021, Vol. 35 ›› Issue (02): 552-567.DOI: 10.19657/j.geoscience.1000-8527.2020.053

• Petrology • Previous Articles     Next Articles

Zircon U-Pb Age and Its Geological Significance of the Anjiacha Formation in Xicheng Pb-Zn Orefield, Western Qinling

HAO Decheng1(), DING Zhenju2(), GAO Zhaokui3, HAN Yaoquan4, ZHOU Hong3   

  1. 1. Lanzhou Mineral Exploration Institute of Gansu Nonferrous Metal Geological Exploration Bureau, Lanzhou, Gansu 730046,China
    2. School of Earth Resources,China University of Geosciences, Wuhan, Hubei 430074,China
    3. Gansu Nonferrous Metal Geological Exploration Bureau, Lanzhou, Gansu 730000,China
    4. Information Center of Gansu Nonferrous Metal Geological Exploration Bureau, Lanzhou, Gansu 730000,China
  • Received:2020-01-21 Revised:2020-07-28 Online:2021-04-25 Published:2021-05-25
  • Contact: DING Zhenju

Abstract:

The Qinling-type Pb-Zn deposit in the Xicheng Pb-Zn orefield (west Qinling orogen) is hosted in Middle Devonian carbonate and fine-clastic sequences, and was formed or transformed by hydrothermal sedimentation. The Anjiacha Formation near the Changba-Lijiagou super-large Pb-Zn deposit is affected by regional metamorphism and contact metamorphism, and high-grade biotite-quartz schist is widely distributed. Detrital zircon U-Pb dating of the biotite-quartz schist yielded a maximum age of (401±6) Ma. Combined with lithogeochemical evidence, it is considered that the sedimentary structural environment was mainly active continental margin, which was likely the product of Early-Middle Devonian fault basin in the northern margin of Yangtze plate. The detrital provenance may have been the Yangtze Craton and north Qinling region.

Key words: Anjiacha Formation, Devonian, detrital zircon, U-Pb geochronology, petrochemistry, Xicheng Pb-Zn orefield

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