A precise U–Pb age on cassiterite from the Xianghualing tin-polymetallic deposit (Hunan,South China) |
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| Authors: | Shunda Yuan Jiantang Peng Ruizhong Hu Huimin Li Nengping Shen Dongliang Zhang |
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| Institution: | (1) State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China;(2) Graduate School, Chinese Academy of Sciences, Beijing, 100049, China;(3) Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037, China;(4) Tianjin Institute of Geology and Mineral Resources, Tianjin, 300170, China;(5) Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, Guizhou Province, China |
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| Abstract: | We report the first precise U–Pb isotope data on cassiterite from the large Xianghualing tin-polymetallic deposit in the
central Nanling district, South China. The results show that four separates from sample XF-51 have a relatively narrow range
of 206Pb/238U apparent ages, varying from 152 to 157 Ma, and the three 206Pb/238U apparent ages yield a weighted average value of 156 ± 4 Ma (MSWD = 0.32). Separates from two other cassiterite samples do
not have sufficient radiogenic Pb to generate a reliable 206Pb/238U age. Seven separates from the above three cassiterite samples define a well-constrained 238U–206Pb isochron corresponding to an age of 157 ± 6 Ma (MSWD = 34). A comparison of the U–Pb cassiterite ages with published Ar–Ar
dates on muscovite from this deposit and K–Ar age data on biotite from the pluton genetically related to the tin mineralization
in this area demonstrates that the U–Pb isotope system of cassiterite is a potential geochronometer. Combined with the Ar–Ar
dates of muscovite from this deposit, we can constrain the absolute age of tin-polymetallic mineralization in Xianghualing
at 154–157 Ma. The dates obtained in this study, consistent with the published geochronological results from other important
deposits in this region, reveal that the large-scale tungsten–tin mineralization in the central Nanling region was predominantly
emplaced during 150–161 Ma. |
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| Keywords: | U– Pb isotope system Cassiterite Radiometric dating Tin mineralization Xianghualing Nanling China |
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