合仁坪金矿H-O-S-Pb同位素地球化学特征及其成因机制

对合仁坪金矿的H-O-S-Pb同位素地球化学分析研究显示，其硫化物的δ³⁴S值介于-4.8‰~2.0‰之间，硫化物的²⁰⁶Pb/²⁰⁴Pb比值为17.419~17.436， ²⁰⁷Pb/²⁰⁴Pb比值为15.519~15.535， ²⁰⁸Pb/²⁰⁴Pb比值为 37.86~37.90.成矿流体的δD介于-62.3‰~-53.0‰之间，δ¹⁸O 介于4.2‰~11.8‰之间.合仁坪金矿的S， Pb， O和H同位素研究结果表明，成矿物质具有深源特征，成矿流体为岩浆热液水来源，成矿作用存在明显的氧化还原特征，并形成本区特色的褪色蚀变带.该金矿是一个与深部岩浆作用有关的金矿床，找矿应着眼于赋矿地层内的氧化还原界面，褪色蚀变带是其主要的找矿标志.

H-O-S-Pb Isotopic Geochemical Characteristics and Formation Mechanism of the Herenping Gold Deposit

The geochemical analysis of H-O-S-Pb isotopes in the Herenping Gold Mine was carried out. The δ³⁴S values of sulfides from ore lie in-4.8‰~2.0‰. The ratios of ²⁰⁶Pb/²⁰⁴Pb， ²⁰⁷Pb/²⁰⁴Pb and ²⁰⁸Pb/²⁰⁴Pb from sulfide ores are 17.419~17.436， 15.519~15.535 and 37.86~37.90， respectively. The δD values of the fluid fall in-62.3‰~-53.0‰，and the δ¹⁸O values of the fluid are 4.2‰~11.8‰. These sulfur， lead， hydrogen and oxygen composition indicate that the ore-forming materials originate from the depth and the ore-forming fluid from magmatic hydrothermal， and mineralization has the characteristics of redox which formed the faded alteration zone in the region. Considering that the Herenping gold deposit is related to the deep magmatism， the ore prospecting should focus on the redox interface in the host strata and the faded alteration is the main indicator for the deposit.