老挝帕奔金矿床同位素地球化学特征

Stable Isotope Geochemistry of the Phapon Au Deposit in Laos

对矿床热液成矿期含金方解石中H、O、C稳定同位素测定,探讨主成矿期成矿流体和成矿物质来源,为深入研究帕奔金矿成矿机制、成矿作用提供了新的地球化学资料。含金方解石碳氧同位素^(13)C_(V-PDB)值分布在-4.5‰^-5.2‰之间,^(18)O_(V-SMOW)值分布于20.0‰~20.8‰之间,含金的方解石矿物来源为流体与二叠纪海相碳酸盐岩相互作用产物;含金方解石矿物中包裹体水的δD值在-49‰^-92‰之间,δ^(18)O-H_2O的范围为8.32‰~13.42‰,成矿流体来源与岩浆活动存在密切关系。

Abstract： This paper deals with stable isotopic compositions of H, O and C for Au-bearing calcite from the Phapon Au deposit in Laos. The δ13C values vary from -4.5‰ to -5.2‰, δ18O values vary from 20‰ to 20.8‰ The 6D values for inclusions in Au-bearing calcite range from -49‰ to -92‰, The δ18O values from 8.32‰ to 13.42‰. These show that the ore fluids were derived from magmatism.