湖南柏坊铜矿床稳定同位素地球化学初步研究

对湖南柏坊铜矿床矿石和脉石矿物进行矿物包裹体、碳、氧、氢和硫同位素测定，获得成矿均一温度约为182℃～192℃，盐度为1．2～4．7wt％。方解石的δ^13C为-2．0‰～3．1‰，δ^18Osmow为12．6‰～20．9‰，δD为-67．3‰～-131．6‰，氢、氧和碳同位素数值随矿体浅部到深部由小到大的变化，显示出热液可能是多来源的。硫化物中辉铜矿的δ^34S为-31．8‰～2．9‰，黄铁矿的δ^34S为-2．1‰～＋2．9‰。黄铁矿的硫同位素组成大于辉铜矿的硫同位素组成，表明硫同位素达到平衡，并估算出δ^34S∑s为0‰，δ^34S∑s值小，指示出硫可能是岩浆来源。

Primary research on geochemistry of stable isotopes in the Bofang copper deposit, Hunan

After determining mineral inclusion, isotopes of C, O, H and S in ores and gangues from the Bofang copper deposit of Hunan, the study has gained ore-forming homogenization temperature of about 182℃～192℃,and salinity of 1.2～4. 7wt%. According to the results that δ^13C is -2. 0‰-3. 1‰, δ^18Osmow is 12. 6‰-20. 9‰, and δD is -67.3‰-131.6‰ in calcite, and the isotopic values of H, O, C would change from lower values in shallow part of the orebodies to higher values in deep part of the orebodies, the study found that the hydrotherm may be from different sources. Furthermore, based on the discovery that δ^34S is as -31.8‰-2. 9‰ in chalcocite, and δ^34S is as -2.1‰-2.9‰ in pyrite, from which we can find that S isotopic composition of pyrite is higher than that of chalcocite and conclude that S isotopes have reached equilibrium. The study also estimated δ^34S∑sof 0‰, and this lower value of δ^34S∑S.sindicated that S may come from magma.