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摘要
Zircon U-Pb geochronological, Hf isotopic and petrological analyses have been carried out on the Late Jurassic Xitian granite emplaced in the middle part of Shiwandashan-Hangzhou belt, which is closely related to the economically important Xitian tungsten-tin deposit in eastern Hunan Province, Southeast China. LA-ICP-MS zircon U-Pb dating of one representative granite sample yields weighted means 206Pb/238U age of ~150 Ma, suggesting that both the Xitian granite and Xitian tungsten-tin deposit have the same formation age. In-situ zircon Hf isotope analysis indicates that the Late Jurassic Xitian granite mainly originated from partial melting of metamorphic basement rocks with a small amount of mantle materials. Electron microprobe analyzer(EMPA)analysis suggests that biotite has high Fe/(Fe+Mg)values and low oxygen fugacities, which are in favor of W-Sn mineralization. The above data and regional geological data indicate that large scale of crustal extension and thinned would be the most important mechanism to result in the Mesozoic magmatism in South China, which is also the key reason why abundant polymetallic deposits developed in South China during Late Mesozoic. The Late Jurassic magmatism shows a close relationship with the Xitian tungsten-tin deposit. ? 2022, Science Press. All right reserved.
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