Rock-Forming and Ore-Forming Temperatures of Lianhuashan Tungsten Deposit, Guangdong Province

摘要

The Lianhuashan tungsten deposit occurs in the volcanic terrain in the coastal area of Southeast China, where rhyolite, quartz porphyry and granite constitute a complete magmatic series. The orebodies are located in the endo- and exo-contacts between the quartz porphyry and the metasandstone of the Xiaoping coal measures. Homogenization temperatures of melt inclusions in zircon and quartz are 1100℃ and 1050℃ for rhyolite, 1000℃ and 860℃ for quartz porphyry, and 950 - 1000℃ and 820℃ for granite, respectively, demonstrating that the rock-forming temperatures dropped successively from the eruptive to the intrusive rocks and that the homogenization temperatures of melt inclusions in zircon are 50 - 180℃ higher than those in quartz. Homogenization temperatures of gas-liquid inclusions in quartz are 230 - 520℃ (mostly 230 - 270℃) for quartz porphyry, 200 - 450℃ (mostly 200 - 360℃) for ore-bearing quartz veins, 150 - 210℃ for granite and 170 - 200℃ for the vein quartz in it. Quartz from the quartz porphyry and from the ore-bearing quartz veins show similar characteristics in inclusion type and homogenization temperature, indicating that intergranular solutions must have been formed upon cooling of magma and that ore-forming solutions for the tungsten mineralization were evolved mainly from ore- bearing intergranular solutions in the quartz porphyry.