摘要
寨上金矿床共发现金矿脉22条,金矿体19条。通过氢、氧同位素分析得出:该区成矿流体水具有多来源特征。δ34S的组成特点可能反映了硫源为岩浆硫和地层硫的混合。碳的来源主要由海相沉积碳酸盐岩经溶解作用和花岗岩岩浆热液提供。矿石稀土元素并没有完全继承围岩的特征。成矿流体具有以下特征:成矿流体为中低温、低盐度、低密度、多期次活动的流体。金矿成矿是在300Ma之后燕山晚期形成的。成矿热液中,金主要以硫化物配合物的形式迁移。成矿流体与围岩发生充分的物质交换后,运移到裂隙发育部位,并因为流体的混合和围压突然降低,成矿流体产生强烈的沸腾作用,使成矿物质沉淀富集成矿。
22 gold veins and 19 orebodies were discovered in the Zhaishang gold deposits. The hydrogen and oxygen isotopic geochemistry indicate that ore -forming fluids have a multi -sources. δ^34S composition reflects a mixed sulfur source from both magma and country rocks. The main source of carbon was provided by the dissolution of marine carbonate sediments and also the granite magma and hydrothermal. Rare earth elements from Ores did not entirely inherit the characteristics of the country, rocks. Ore - forming fluids have the following features ： medium to low temperature, low-salinity, low - density, multi - phases of fluid activity. Gold mineralization formed in the late Yanshanian Period later than 300Ma. Gold elements were carried in the form of sulfide complex and migrated into the fractures after full exchange between ore - forming fluids and surrounding rock. Because of the fluid mixing and sudden reduces in pressure, the ore - forming fluids had a strong boiling which results the deposition of gold.
出处
《地质与勘探》
CAS
CSCD
北大核心
2009年第2期27-37,共11页
Geology and Exploration
关键词
氢
氧同位素碳
氧同位素
硫同位素
稀土元素
流体包裹体
Hydrogen and Oxygen isotopes, Carbon and Oxygen isotopes, sulfur isotope, rare earth elements, fluid inclusions
