Huangfengling area is located in middle of Zhuguangshan pluton， Nanling large igneous province in southern China. Researches on the LA-ICP-MS zircon U-Pb geochronology， mineralogy and petrogeochemistry of granites in this area have been conducted， proposing that the origin of uranium—bearing granites were related with the liquid immiscibility of fluorine—rich magma. Based on the divide of granites in Huangfengling area， LA-ICP-MS zircon U-Pb dating results showed that age of reddening pegmatoid granite was 225.4±1.7Ma， while the reddening finegrained biotite granite associately were 222.9±2.7Ma and 226.9±2.7Ma respectively， indicating that granites of both types were formed synchronization and later than the Indosinian granite（235.4+1.1Ma）. The results of the microscopic identification，X—ray powder diffraction and thermodynamic calculation of feldspar showed that the potassium and sodium feldspar which belonging to the maximum microcline and low albite series， have been formed in the diagenetic stage mainly， which were different with the terminal heat—treated albite. Analysis of element geochemical showed that Si-Al and K-Na separation， Nb-Ta， Zr-Hf and other elements couple differentiation， the rare earth elements distribution pattern were mutagenicity and conjugation and ΣREE-（La/Yb）N with La-La/Sm owned the separation characteristics of evolution direction in different types of granites. Moreover， the presence of late stage Li-F granite porphyry vein associated with many fluorite deposits（or prospecting points）around Huangfengling area implied that there have been massive fluorine element. Comprehensive analysis of these characteristics indicates that， the origin of uranium—bearing granites was related to the fluorine—rich liquid immiscibility in diagenetic stage of Huangfengling area， and belonged to the medium—low stage in this system， which have formed the rich and poor silicate systems， resulted the phenomenon of reddening pegmatite granite associated with fine granite uraniumbearing in space and geochemical conjugation. The enrichment of uranium in granites which formed from liquid immiscibility have laid the foundation for mineralization later.
Zou Mingliang,Fang Shiyi,Xu Hao et al. Liquid immiscibility for U—bearing granites of Huangfengling area，in the middle of Zhuguangshan pluton， southern China
[J]. Chinese Journal of Geology, 2016, 51(3): 850-871.