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研究证实冬瓜山叠生式层状铜矿热液改造型流体包裹体均一温度介于 2 2 4℃～ 478℃之间 ,盐度介于 3 2 0 %～ 43 9%之间 ,呈双峰式分布 ;硬石膏与石炭系海水硫酸盐δ34 S相当 ,矿石黄铁矿和石英闪长岩黄铁矿中δ34 S比较接近岩浆中的硫 ;表明冬瓜山叠生式层状铜矿床既有沉积特征 ,又有热液改造的特征 ,且后者在铜矿富集成矿过程中占主导地位。碳同位素研究表明 :矿区地层和矿体中方解石脉的δ1 3C、矿石中的δ1 3C和矿体石英脉中的碳主要来源于沉积碳酸盐 ,但经过一系列的地质作用 ,使得方解石脉中的δ1 3C减少的速率明显的比围岩快。石英脉的δ1 8OSMOW介于 0 937%～ 1 390 %之间 ,δDSMOW介于 - 5 50 0 %～ - 7 2 90 %之间 ,说明流体中的氧、氢同位素接近岩浆水。因此热液改造型流体主要来自岩浆
The results show that the homogenization temperature of hydrothermal fluid inclusions in the Dongguashan superimposed stratiform copper deposit is between 224 and 478 ℃ and the salinity is between 320 and 439% Type distribution; anhydrite and carboniferous seawater sulfate δ34S considerable, ore pyrite and quartz diorite pyrite δ34 S is relatively close to the magma in the sulfur; that melon mountain stratified layered copper deposit both Sedimentary features, but also the hydrothermal transformation of the characteristics, and the latter in the process of enrichment and mineralization of copper dominates. Carbon isotope studies show that δ13C of calcite veins and δ13C of ore bodies and carbon in quartz veins of ore bodies are mainly derived from sedimentary carbonate, but after a series of geological processes, the calcite veins The δ1 3C reduction rate is significantly faster than the surrounding rock. Δ1 8OSMOW of quartz veins ranged from 0 937% to 1 390% and δDSMOW was between -550 0% to -7 2 90%, indicating that oxygen and hydrogen isotopes in the fluid are close to magmatic water. Hydrothermal fluids are therefore mainly derived from magma