GEOPHYSICAL AND GEOCHEMICAL FEATURES OF ORE-FORMING FLUID IN FANKOU SUPER-LARGE LEAD-ZINC DEPOSIT
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摘要: 流体是汲取矿质、搬运矿质和沉淀矿质的介质, 是当代盆地研究和成矿研究的重要课题.在野外矿床地质研究和室内镜下研究、地球化学研究的基础上, 对矿区矿物流体包裹体的温度、盐度和化学成分的测试分析结果表明, 凡口矿床的成矿流体为低盐度、弱酸性的中低温热液, 属富CO2的K+-Ca2+-Cl-型的流体.它既不同于盆地压实流体, 也不同于斑岩型矿床的成矿流体, 是具有独特组成的深部循环流体Abstract: The ore forming fluid, a medium that absorbs, transports and precipitates mineral materials, is an important topic for the research into the contemporary basin and mineralization. The testing analysis is made of the temperature, salinity and chemical composition of the mineral fluid inclusions in the deposit, on the basis of the field geological research into mineral deposits, the indoor microscopic research and geochemical research. The testing analytical results show that Fankou ore bearing fluid, the intermediate low temperature hydrothermal liquid low in salinity and weak in acidity, belongs to K+-Ca2+-Cl- types of deep circulating ore bearing fluid rich in CO2. This ore bearing fluid, a specific deep circulating fluid, differs not only from the basin compaction fluid but also from the ore forming fluid in the porphyrite type deposit.
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图 1 包裹体温度分布
横线以上为爆裂温度, 横线以下为均一温度.a.金星岭矿段; b.曲塘矿段; c.狮子岭矿段
Fig. 1. Temperature distribution of inclusions
图 2 包裹体中w(K++Na+)-w(Ca2+)-w(Mg2+)比值分布
Ⅰ.凡口矿区; Ⅱ.斑岩铜矿
Fig. 2. w(K++Na+)-w(Ca2+)-w(Mg2+) ratio in fluid inclusions
图 3 包裹体中w(K+)-w(Ca2+)-w(Na+)(a)和w(CO)-w(H2)-w(CH4)(b)比值分布
a.Ⅰ.凡口矿区; Ⅱ.大宝山矿区; Ⅲ.乐昌杨柳塘矿区; Ⅳ.红岩和密西西比河谷型铅锌矿区; Ⅴ.某些斑岩铜矿样品区; Ⅵ.海水、软泥水样品区.b.Ⅰ.凡口铅锌矿床样品区; Ⅱ.斑岩铜矿样品区
Fig. 3. w(K+)-w(Ca2+)-w(Na+)(a)and w(CO)-w(H2)-w(CH4)(b)ratios in fluid inclusions
图 4 粤北泥盆系层控矿床铅同位素组成
Fig. 4. Lead isotopic compositions of Devonian stratabound de-posits in northern Guangdong Province
图 5 矿物包裹体δ (D) -δ (18O) 分布
主矿体样品; △晚期方解石脉样品
Fig. 5. δ (D) versusδ (18O) diagram of fluid inclusions in the minerals
表 1 包裹体成分
Table 1. Compositions of fluid inclusions
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