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岩石学报 2013
U-Pb dating of zircons from the Weideshan molybdenum copper polymetallic deposits in Jiaodong Peninsula, China, and its geological significance
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Abstract:
The Weideshan area, located in the Ludong district of the Sulu-Dabie Orogen, is a very important polymetallic mineralization zone. There are a series of medium-and small-sized Mo-Cu-Pb-Zn-Au-Ag polymetallic deposits (occurrences) distributed in and around the Weideshan granite, which is the main rock in the area. The U-Pb dating of the zircons of the mineralization granites from two typical deposits were measured, and all the zircons are magmatic origins. The weighted average U-Pb ages of the zircons from the two granites are separately 113.4±1.8Ma and 114.2±2.1Ma,identical with the results (108±2Ma, 117.7±2.9Ma~113.4±2.5Ma) by zircon SHRIMP technique measured before. Based on the studies on the difference between the granites and the related mineralization forming age in East China, it was suggested that the copper and molybdenite mineralization in Weideshan area was about 110Ma, belong to the Yanshanian polymetallic deposits metallogenetic series. Coupled with previous researches, it was suggested that the petrologenesis and metallogenesis in Weideshan area was probably the result of crust-mantle interactions under the geodynamic setting of the lithospheric thinning and extension.
