江西留龙金矿矿质来源及硫、铅、氢、氧同位素组成研究

STUDY ON THE SOURCE OF LIULONG GOLD NINERAL-MATTER AND COMPOSITIONS OF SULFUR,LEAD, HYDROGEN AND OXYGEN ISOTOPES,JIANGXI

留龙金矿存在两种不同类型的金矿体，一类为毒砂石英脉；另一类为铅锌硫化物石英脉。它们都受上施组火山沉积凝灰岩中近南北向断裂控制，具有不同的矿物组合、成矿温度和同位素组成。毒砂石英脉形成于１４０～２２０℃，δ＿（３４）Ｓ的值—０．０４‰～—１．０４‰，铅同位素组成与变沉凝灰岩一致，成矿流体以大气降水为主，是加热了的天气降水热液改造围岩而形成的改造型矿体。铅锌硫化物石英脉形成于２６０～３２５℃，δ＿（３４）Ｓ值—２．３５‰～０．８５‰，铅以加里东期岩浆源铅为主，混入了部分毒砂石英脉中的铅，成矿流体以岩浆水为主，是岩浆热液沿断裂充填，交代毒砂石英脉而形成的复合成因矿体。

Two different types of gold ore bodies exist in Liulong gold deposit ,One is arsenopy-rite quartz vein ,another quartz vein of lead zinc Sulfuret ,They are all controlled by the South north rift in the Volcanic Sedimentary tuff in the Shang shi Formation and have different mineralassemblage ,mineral forming temperature and isotope composition.The arsenopyrite quartz veinwas formed around 140～220℃,δ￣(34)S value 0. 01‰～ 1. 04‰ ,lead isotope composition beingconsistent with metamorphic sedimentary tuff, the atmospheric water is main mineral-formingflurcl which is the transformed ore body formed by the heated meteoric water hydrothermal,this hydrothermal transformed wallrocks. The quartz vein containing lead zinc sulfuret wasformed around 260～325℃,δ￣(34) value 2. 35‰～0. 85‰,most of the lead is Caledonian rock-magma source lead,mixed part lead in the arsenopyrite quartz vein。 Most of the mineral-formingfluid is magmatic water.It is the polygenetic ore body formed by the filling of rock-magma hy-drothermal along the rift and replacement arsenopyrite quartz vein.