CAJ | 학술논문

多才玛超大型铅锌矿床是三江北段铅锌铜银多金属成矿带中的典型矿床，其主要硫化物的δ34 S 值变化范围大，主要集中于－26.72‰～－4.1‰之间，具塔式分布特征；其中，方铅矿的δ34 S 最高值大于黄铁矿的相应值。这表明成矿过程中硫同位素未达到平衡，硫主要是细菌还原硫酸盐的产物。矿区208 Pb ／204 Pb ＝38.985～39.253，206 Pb ／204 Pb ＝18.825～18.918；铅同位素构造环境演化图解和Δβ－Δγ成因分类图解显示铅的来源复杂多样，不仅来自上地壳和造山带，还来自壳幔混合的俯冲带。δ13 CV-PDB ＝1.2‰～6.7‰，而δ18 OV-SMOW ＝16.4‰～23.4‰，碳氧同位素明显来源于海相碳酸盐岩，成矿过程中应伴随有碳酸盐岩的溶解作用。综上，多才玛大型铅锌矿成矿物质来源复杂，碳酸岩围岩和深部物质都有可能提供成矿物质来源，生物作用参与成矿的痕迹明显。
다재마초대형연자광상시삼강북단연자동은다금속성광대중적전형광상，기주요류화물적δ34 S 치변화범위대，주요집중우－26.72‰～－4.1‰지간，구탑식분포특정；기중，방연광적δ34 S 최고치대우황철광적상응치。저표명성광과정중류동위소미체도평형，류주요시세균환원류산염적산물。광구208 Pb ／204 Pb ＝38.985～39.253，206 Pb ／204 Pb ＝18.825～18.918；연동위소구조배경연화도해화Δβ－Δγ성인분류도해현시연적래원복잡다양，불부래자상지각화조산대，환래자각만혼합적부충대。δ13 CV-PDB ＝1.2‰～6.7‰，이δ18 OV-SMOW ＝16.4‰～23.4‰，탄양동위소명현래원우해상탄산염암，성광과정중응반수유탄산염암적용해작용。종상，다재마대형연자광성광물질래원복잡，탄산암위암화심부물질도유가능제공성광물질래원，생물작용삼여성광적흔적명현。
The Duocaima Pb-Zn deposit is located in the northern Sanjiang polymetallic metallogenic belt.The values of δ34 S in main sulfides are significantly variable,mainly ranging in between -26.72 ‰and -4.1 ‰ with a normal distribution.The maximum δ34 S value of galena is larger than the correspond-ing value of pyrite,indicating that the sulfur isotopes are in disequilibrium during the process of minerali-zation and that sulfur is originated mainly from bacterial sulfate reduction.The 208 Pb /204 Pb values vary from 38.985 to 39.253,and 206 Pb /204 Pb from 18.825 to 18.918.Tectonic evolution and Δβ~Δγgenet-ic classification diagrams of lead isotope show that the source of lead is complex and diverse.It is not only originated from the upper crust and orogenic belts,but also from the subducted zone with crust and man-tle mixed.The values of δ13 CV-PDB 1.2 -6.7‰ and 18 OV-SMOW 16.4 -23.4‰ show that the C and O are derived from marine carbonates,accompanied by carbonate dissolution.The origin of the Duocaima Pb-Zn deposit is complex,The hosting carbonates and the mantle may provide metals,while biomineraliza-tion may play an important role in the ore-forming process.