摘要
对沙溪斑岩铜(金)矿床钻孔岩芯中含矿裂隙的系统测量,初步查明了含矿裂隙在三维空间中的变化趋势,确定裂隙的发育程度有效地控制了铜、金矿化的强度,并据此推断了深部矿化延续的可能性。稳定同位素研究结果表明:矿区硫来自岩浆源,成矿期热液以岩浆水为主导,并有少量天水加入;蚀变岩的δ^(18)O则值与铜含量及LREE/HREE比值呈明显的正相关,与锌、锰、钴含量呈负相关;成矿体系具较低的水/岩比值,成矿晚期和浅部水/岩比值减小,显示成矿物质主要是由岩浆流体带入,并与热液的脉动式活动有关。
The shaxi porphyry copper(gold) deposit is located within theTancheng-Lujiang deep fault belt. Stockworks are developed in this deposit.By measuring the ore-bearing fissures in drilling cores systematically, thedistribution pattern of ore-bearing fissures in three dimensions has beendescribed preliminarily. This study shows that the mineralized intensityof Au and Cu is controlled by the permeability of wall rocks. Themineralization should be continued in depths, but the mineralized intensityis getting weaken. The data of stable isotope indicate that the sulphurcomes from magmatic source. The hydrothermal fluid during mineralizationis composed mainly of magmatic water, but mixing with a small amount ofmeteoric water. The δ^(18)O values of altered-rocks have positive correlationwith Cu and LREE/HREE values, and have negative correlation with Zn,Mn and Co. The ore-forming system has low W/R values, which indicatesthat Cu and Au are derived mainly from magmatic fluid, and have relationto pulsive activity of hydrothermal fluid.
基金
国家自然科学基金
关键词
铜矿
金矿
斑岩
矿床
成因
裂隙
porphyry copper(gold) deposit
fissure abundance
isotopic composition
metallogeny
Anhui
