The zircon U-Pb geochronology, petrogeochemistry, zircon and biotite mineral geochemistry of biotite monzogranite (-porphyry) in Shimenlou area of northwestern Jiangxi province have been studied. The LA-ICP-MS zircon U-Pb 206Pb/ 238U weighted average ages of zircons from the biotite monzogranite (-porphyry) are in the range of 145.6~148.4 Ma, suggesting late Late Jurassic. The rock is common low fractionation S-type granite. The magma properties are moderately reductive (the ratio of Fe2O3/FeO = 0.18~0.19, the ratio of Ce 4+/Ce 3+ =14~158, log10(fO2)D=-22.4~-6.9, averaging -13.8 (> IW-3.6)), strong evolution (the ratio of K/Rb =153~206), low fractionation (the ratio of Rb/Sr =1.6~4.2) and low temperature (T(zircon)Ti = 619~881℃, averaging 750℃). The magma was derived from the magma source enriched area of the upper crust, which was formed by remelting and regenerating of the Neoproterozoic granitoids derived from the early Mesoproterozoic crustal material (Shuangqiao Mountain Group). The rock has the metallogenic material, time and spatial specialization and metallogenic possibility of forming tungsten deposit.
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