浙江西裘铜块状硫化物矿床火山-热泉沉积成矿的地质地球化学证据

Evidence for metallogenic geochemistry of volcano-hot spring deposition in Xiqiu Copper Massive Sulfide Deposit, Zhejiang Province

浙江西裘矿区新元古代火山-热泉活动强烈，矿石Cu：Zn：Pb原子百分比与火山岩和热水沉积硅质岩相似。矿δ34S值为-6．5～2．8‰，δ30si值为-0．2‰～0．6‰，δ18O值为8.14‰～22．32‰，铅同位素示踪主要为下地壳铅；矿石具较高的As、Sb、Bi、Ga、Zn、Ba等含量；具较低的Al／（AI＋Fe＋Mn）比值，Zn／（Pb＋Zn）比值接近1，均表现出火山-热泉沉积成矿地球化学特征。

There were strong volcano and hot spring activities in Late Proterozic in Xiqiu Mining Area, Zhejiang Province. The volcanic rocks and hydrothermal sediment cherts have high contents of the major metallogenic elements. Their atomic percentage of Cu: Zn: Pb is similar very much among volcanic rock, hydrothermal sediment chert and ore. Therefore, the metallization has a direct bearing on the volcano and hot spring activities in Xiqiu Area. The δ34S values range from - 6. 5‰ to 2. 8‰, the δ30Si values range from - 0. 2‰ to 0. 6‰, and the δ18Ovalues from 8. 14‰ to 22. 32‰. Lead isotopes originated mainly from lower crust leads. The ores have high contents of As, Sb, Bi, Ga, Zn, and Ba, and have low Al/ (Al + Fe + Mn) ratios, with Zn/ (Pb + Zn) ratios of near 1. Therefore, Xiqiu copper massive sulfide deposit can be identified as volcano and hot spring deposition.