| Citation: |
LIU Yongqiang, LYU Zhicheng, WANG Hu, CHENG Haiming. 2025. Zircon U−Pb age and geochemical characteristics of biotite monzonitic granite and mineralization background in Xiaodachuan Pb−Zn−Cu deposit of Inner Mongolia, the southern Great Khingan Range. Geological Bulletin of China, 44(2~3): 404-423. doi: 10.12097/gbc.2023.08.013
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Zircon U−Pb age and geochemical characteristics of biotite monzonitic granite and mineralization background in Xiaodachuan Pb−Zn−Cu deposit of Inner Mongolia, the southern Great Khingan Range
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Abstract
Objective The newly discovered Xiaodachuan Pb−Zn−Cu deposit in the southern section of the Greater Khingan Range occurs in the biotite monzonitic granite body and is spatially affected by the late Yanshanian intrusive rocks. The age of diagenesis and mineralization, petrogenesis and metallogenic geological background are still unclear. The study can provide a new basis for the metallogenic regularity of lead and zinc in the area.
Methods Samples of biotite monzogranite from the Xiaodachuan Pb−Zn−Cu deposit in the southern section of the Greater Khingan Range were collected for petrographic study, zircon U−Pb dating, whole rock geochemical analysis, and Sr−Nd isotopic investigations.
Results Research shows that the zircon U−Pb ages of the biotite monzonitic granite are 135.9±0.8 Ma and 134.9±0.8 Ma, indicating that the Pb−Zn mineralization occurred in the Early Cretaceous. The rock geochemical characteristics show that the biotite monzonitic granite is rich in SiO2(71.29%~72.92%), K2O＋Na2O(7.17%~7.89%), Al2O3(13.35%~14.48%), poor in MgO(0.61%~0.64%) and CaO(1.24%~1.73%), enriched in Nb, Ta, Zr, Hf and Th elements, depleted in Ba, K, Sr, P and Ti elements, and the rare earth distribution pattern is “seagull” type. The δEu value is 0.35~0.47, and the negative Eu anomaly is obvious. It belongs to high−potassium calc−alkaline and peraluminous A2−type granite. The Sr−Nd isotope characteristics show that the (87Sr/86Sr)i value is 0.70545~0.70548, the εNd(t) value is −1.7 ~ −0.3, and the two−stage model age of Nd isotope is 1071~957 Ma.
Conclusions Combined with the chronological and geochemical characteristics, it is considered that the diagenetic material is a mixture of new crust and mantle−derived material and is contaminated by the upper crust. The Xiaodachuan biotite monzonitic granite was formed in an extensional environment after the closure of the Mongolia−Okhotsk Ocean, which also led to the occurrence of diagenesis and mineralization in the region.
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References
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LIU Yongqiang, LYU Zhicheng, WANG Hu, CHENG Haiming. 2025. Zircon U−Pb age and geochemical characteristics of biotite monzonitic granite and mineralization background in Xiaodachuan Pb−Zn−Cu deposit of Inner Mongolia, the southern Great Khingan Range. Geological Bulletin of China, 44(2~3): 404-423. doi: 10.12097/gbc.2023.08.013
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Figure 1.
Geotectonic position (a) and geological and mineralogical sketch map (b) of the southern section of the Great khingan Range
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Figure 2.
Geological sketch map of the Xiaodachuan Pb−Zn−Cu deposit
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Figure 3.
Granite hand specimens and microscopic photographs
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Figure 4.
Profile of survey line 0 for Cu ore bodies No. 1, No. 2 and No. 3 (a) and survey line 3 for Pb−Zn ore body No. 6 (b) in the Xiaodachuan deposit
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Figure 5.
Illustration of TAS (a) and SiO2−K2O discrimination (b) for the biotite monzogranite of the Xiaodachuan Pb−Zn−Cu deposit
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Figure 6.
A/CNK−A/NK diagram for the biotite monzogranite of the Xiaodachuan Pb−Zn−Cu deposit
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Figure 7.
Chondrite-normalized rare earth element partition curves (a) and primitive mantle normalized trace element spiderweb plots (b) of biotite monzogranite from the Xiaodachuan Pb−Zn−Cu deposit
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Figure 8.
Zircon CL images and test position of biotite monzonitic granite in the Xiaodachuan Pb−Zn−Cu deposit
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Figure 9.
The XBC-7, XBC-9 zircon U−Pb age concordia diagrams (a, c) and age weighted average diagrams (b, d)
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Figure 10.
Illustration of the type discrimination of the biotite monzogranite in the Xiaodachuan Pb−Zn−Cu deposit
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Figure 11.
La−La/Sm diagram (a) and (La/Yb)N−Nb/La diagram (b) for the biotite monzogranite of the Xiaodachuan Pb−Zn−Cu deposit
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Figure 12.
Illustration of (87Sr/86Sr)i−εNd(t) of the biotite monzogranite of the Xiaodachuan Pb−Zn−Cu deposit and typical deposits in the neighboring area that are related to metallogenic magmatism (a) and mixing calculations for source and melt contarninations (b)
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Figure 13.
SiO2−TFeO/(TFeO+MgO) (a) and (Y+Nb)−Rb (b) tectonic setting discrimination diagrams of the biotite monzogranite in the Xiaodachuan Pb−Zn−Cu deposit
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Figure 14.
Lead isotope △β−△γ classification diagram（a）and sulfur isotope composition diagram（b）of typical ore deposits in Xiaodachuan Pb−Zn−Cu deposit adjacent area