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.
出处
《现代地质》
CAS
CSCD
北大核心
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)
关键词
成矿流体
稳定同位素
矽卡岩型铜矿床
凤凰山
铜陵
安徽
metallogenic fluid
stable isotope
skarn-type Cu deposit
Fenghuangshan
Tongling
Anhui
