Study on the Characteristics and Origin of Ore-forming Fluids of Nancha Gold Deposit in Jilin Province
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摘要: 吉林南岔金矿床地处辽吉裂谷系老岭隆起带西南端，为20世纪80年代发现的一中型构造蚀变岩型矿床，区内金矿化带（体）产于中元古界老岭群珍珠门组白云质大理岩与花山组片岩接触过渡部位，其热液成矿作用经历了：Ⅰ黄铁矿-石英阶段；Ⅱ黄铁矿-黄铜矿-石英阶段；Ⅲ少硫化物-碳酸盐-石英阶段。流体包裹体研究表明，各阶段矿石中主要发育气液两相包裹体。Ⅰ阶段包裹体均一温度180~260℃，盐度为4.78%~9.47% Nacl；Ⅲ阶段包裹体均一温度为164~188℃，盐度为2.76%~4.94% Nacl，表明成矿流体为中低温、低盐度NaCl-H2O体系热液。氢-氧同位素研究结果表明，Ⅰ阶段包裹体水δ18OH2O-SMOW値为3.3‰~5.3‰，δDV-SMOW值变化范围为-90.5‰~-92.6‰；Ⅲ阶段包裹体水δ18OH2O-SMOW値为-6.5‰~-8.2‰，δDV-SMOW值为-105.4‰~-117.7‰，反映Ⅰ阶段成矿流体主要来源于岩浆热液，Ⅲ阶段成矿流体多来源于大气降水。岩浆来源流体温度降低及与大气降水混合可能是金沉淀成矿的主要机制。Abstract: Located in the Southwestern end of the Laoling uplift belt in Liao-Ji rifting zone, Nancha gold deposit is a medium-sized altered rock type deposit and was discovered in the late 1980s. The mineralization belts(ore bodies) mainly occurred in the contact zone between dolomitic marble of Zhenzhumen formation and schist of Huashan formation in Liaohe group of middle Proterozoic Era. Its hydrothermal mineralization experiences three stages:Ⅰ pyrite-quartz stage; Ⅱ pyrite-chalcopyrite-quartz stage; Ⅲ rarely sulfides-carbonate-quartz stage. The study shows that only aqueous two-phase fluid inclusions were developed in ores of different stages. The homogeneous temperature in stageⅠ is 180~260℃, and the salinity is 4.78%~9.47%Nacl. In stage Ⅲ the temperature and the salinity is 164~188℃ and 2.76%~4.94%Nacl respectively. The results of hydrogen-oxygen isotope analysis shows that the δ18OH2O-SMOW and δD V-SMOW composition of mineralization in stageⅠ is 3.3~5.3‰ and -90.5~-92.6‰ respectively; and in stage Ⅲ that is -6.5~-8.2‰ and -105.4~-117.7‰, which means that the fluids of stageⅠmainly came from magmatic solutions and in stage Ⅲ mainly from meteoric water. The decreasing of temperature of magma-derived solutions, combined with meteoric water, may be the main mechanisms of gold deposition.
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