中文摘要：

塔北铅锌矿床是西天山吐拉苏盆地中新近勘查成功的一个重要热液型铅锌矿床。矿体赋存于晚泥盆世-早石炭世大哈拉军山组第五岩性段酸性凝灰岩中，受断裂构造控制。矿石硫化物的δ34 S值介于0.5‰～7.3‰，估算获得成矿流体的总硫同位素值δ34 S∑S约2.7‰，具岩浆硫的特征。晚期石膏的δ34 S值为4.7‰～5.3‰，表明石膏可能是火山热液中的SO2发生歧化反应或火山喷发带出的H2 S挥发分在近地表的氧化环境中反应生成的。矿石铅同位素组成十分稳定，并与大哈拉军山组火山岩的铅同位素组成相似，指示成矿物质来源于赋矿火山岩。碳、氧同位素组成指示成矿流体中碳主要来源于深部岩浆。塔北铅锌矿床可能属于矿化较深的浅成低温热液型矿床。

英文摘要：

The Tabei Pb-Zn deposit,located in the Tulasu basin,Western Tianshan,is a newly explored hy-drothermal deposit.The Pb-Zn orebodies are controlled by fault and hosted in acid tuff of the fifth member of the Upper Devonian to Lower Carboniferous Dahalajunshan Formation.The δ34 S values of the sulfides in the main stage range from 0.5‰ to 7.3‰,and the estimated δ34 S∑S of the ore-forming hydrothermal system is around 2.7‰,which reflects a characteristic of sulfur from magmatic source.Theδ34 S values of the gypsum in the late stage vary from 4.7‰to 5.3‰,indicating that the aqueous sulfate may be derived from the disproportionation of SO2 or the oxidation of H2 S.The compositions of Pb isotopes of sulfides are stable and similar to those of host volcanic rocks,suggesting that the ore-forming materials were derived from the ore-bearing volcanic rocks.Car-bon and oxygen isotopic compositions of calcite show that carbon in ore-forming fluid was mainly derived from the magma.The Tabei Pb-Zn deposit may belong to the epithermal deposit with deeper mineralization.