Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (5): 1429-1441.doi: 10.13278/j.cnki.jjuese.201705108

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Zircon SHRIMP U-Pb Age and Hf Isotope of Granite in Panling Ore Concentration Area in Liaoning and Its Geological Significance

Yang Fengchao1,2, Song Yunhong1, Zhao Yuyan3   

  1. 1. Shenyang Geological Survey Center, China Geological Survey, Shenyang 110034, China;
    2. College of Earth Sciences, Jilin University, Changchun 130061, China;
    3. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China
  • Received:2016-12-13 Online:2017-09-26 Published:2017-09-26
  • Supported by:
    Supported by Land and Resources Survey Project of China Geological Survey Bureau (12120113058800,1212011085280,DD20160049)

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Abstract: The Panling ore concentration area is a typical paleoproterozoic sedimentary basin and a multi-metal ore-concentrated area, located in the zone of Caohekou-Caohecheng-Heiyu, also in the middle section of Liaoning-Jilin rift. The Beidalazi rock developed in the Early Cretaceous and the Gaoliduntai rock developed in Paleoproterozoic are closely related with the mineralization in this ore-concentrated area. The weighted average of the zircon SHRIMP U-Pb age of the Beidalazi rock is (123.9±2.2) Ma, and the weighted average of the zircon SHRIMP U-Pb age of the Gaoliduntai rock is (1 872±13) Ma. The εHf(0) value of the Beidalazi rock is negative, and the εHf (t) is (-16.86——10.95), that indicate its shell material domination when the Beidalazi rock formed. The single stage Hf model age (TDM) is 1 339 Ma, and the two-stage Hf model age (TDMC) is 2 043 Ma. The εHf(0) value of Gaoliduntai rock is negative, and the εHf(t) is 0.29-4.64, that indicate the shell material domination when the Gaoliduntai rock formed. The single stage Hf model age (TDM) is 2 171 Ma, and the two-stage Hf model age (TDMC) is 2 355 Ma. The geochemical results show that:The Beidalazi rock is of high-K calc-alkaline series and highly differentiated aluminous I-type granite, and it is a thickened and molten product of the lower crust with a serious magma contamination in the Late Mesozoic continental margin magmatic arc environment resulted from the Early Cretaceous subduction of the paleo Pacific plate; The magmatic activity directly led to the mineralization of copper, lead, zinc and molybdenum etc. in Panling area. While the Gaoliduntai rock is a kind of low potassium magmatite (tholeiitic) and highly differentiated aluminous I-type granite caused by the melting of the basaltic melt to heat the crust to melt, and it may have the contribution of mantle material invasion induced by a series of faults (including inter-layer fractures) to control the mineralization and distribution of the ore veins.

Key words: Liaoning Panling ore concentration area, granite, zircon SHRIMP U-Pb age, Hf isotope, Early Cretaceous, Paleoproterozoic

CLC Number: 

  • P588.121
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