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作 者:瞿泓滢[1,2] 裴荣富[1] 王永磊[1] 李进文[1]
机构地区:[1]中国地质科学院矿产资源研究所国土资源部成矿作用与资源评价重点实验室,北京100037 [2]南京大学内生金属矿床成矿机制研究国家重点实验室,江苏南京210093
出 处:《现代地质》2010年第2期228-236,共9页Geoscience
基 金:中国地质调查局项目(200799093);南京大学内生金属矿床成矿机制研究国家重点实验室基金项目(15-09-01)
摘 要:以安徽铜陵凤凰山铜矿床为例,通过对成矿流体特征的研究以及碳、氢、氧同位素分析,探讨矿床的成矿机制,分析成矿流体性质以及成矿流体来源。凤凰山铜矿床石榴子石、石英和方解石普遍发育流体包裹体,其类型为V-L型、V-L+S型、V-L富气相型和V型。石榴子石、石英和方解石中的流体包裹体分别集中于3个区,其流体包裹体的温度和盐度区间代表成矿流体演化的3个不同阶段。成矿流体经历了从高温度、高盐度向低温度、低盐度的持续演化过程,与成矿作用阶段基本对应,降温、流体沸腾是导致流体中巨量铜元素卸载的主要因素。氢、氧同位素组成表明成矿流体以岩浆水为主,可能在成矿晚期混有少量大气降水。This study takes the Fenghuangshan copper deposit as an example to examine the metallogenic mechanism,the nature and origin of ore-forming fluid using the characteristics of metallogenic fluid and C,D and O isotope analysis.The Fenghuangshan deposit contains garnet,quartz and calcite in which fluid inclusions were well developed.The fluid inclusion can be classified into V-L type,V-L+S type,V-L rich gas type,and V type.Most of the fluid inclusions in garnet,quartz and calcite are concentrated mainly in three zones and the temperatures and salinity ranges of fluid inclusions represent three different phases of ore-forming fluid evolution,indicating that the fluid experienced a continuous process of evolution,which was well coupled with metallogenic phases of the Fenghuangshan deposit.Temperature decreasing and fluid boiling resulted in the discharge of a large amount of copper from Cu-bearing fluid.Furthermore,H and O isotopic analysis indicates that the ore-forming fluid consists mainly of magmatic water,with minor meteoric water at the late stage of mineralization of the Fenghuangshan deposit.
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