广东莲花山钨矿成岩成矿温度研究

A STUDY OF ROCK-FORMING AND ORE-FORMING TEMPERATURES OF THE LIANHUASHAN TUNGSTEN DEPOSIT,GUANDONG PROVINCE

利用淬火油浸法测得莲花山钨矿流纹岩、石英斑岩和花岗岩锆石和造岩矿物石英中熔融包裹体均一化温度。证明本区成矿溶液来源主要与石英斑岩的含矿粒间溶液有关。

The Lianhuashan tungsten deposit occurs in the volcanic terrain of the southeast coastal areaof China,where rhyolite ,quartz porphyry and granite form a magmatic evolution series. Orebodiesoccur at the endo- and exocontact zone between quartz porphyry and metasandstone of Xiaopingcoal measures. Homogenization temperatures of melting inclusions in zircon andin quartz are 1100℃and 1050℃ for rhyolite,1000℃ and 860℃for quartz porphyry ,and 950～1000℃ and 820 ℃for granite respectively, suggesting that rock-forming temperatures dropped successively fromeruptive rocks to intrusive rocks, and that homogenization temperatures of melting inclusions inzircon are 50～180℃ higher than those in quartz. Homogenization temperatures of gas-liquid inclusions inquartzare520～230℃(thebestbeing230～270℃)forquartzporphyry , 450～200℃(the best being 200～360℃)for ore-bearing quartz veins, 150～210 ℃ for granite and 170～200℃ for its vein quartz. Quartz from the quartz porphyry is similar to that from the ore-bearingquartz veins in inclusion types and homogenization temperatures,indicating that intergranular so-lution was formed during the cooling of magma and that ore-forming solution in this area was de-rived mainly from ore-bearing intergranular solution in the quartz porphyry.