吉林大学学报(地球科学版) ›› 2015, Vol. 45 ›› Issue (6): 1657-1666.doi: 10.13278/j.cnki.jjuese.201506109
张志辉1,2,3, 张达3, 狄永军3, 李兴俭3, 阙朝阳4, 马先平5, 杜泽忠1,2
Zhang Zhihui1,2,3, Zhang Da3, Di Yongjun3, Li Xingjian3, Que Chaoyang4, Ma Xianping5, Du Zezhong1,2
摘要:
安徽铜陵焦冲金矿床位于长江中下游铁铜金银铅锌成矿带铜陵矿集区内,矿体主要赋存在下二叠统栖霞组(P1q)灰岩中。根据野外地质特征及含矿组合,将矿床划分为3个成矿阶段:黄铁矿-石英阶段、石英-硫化物阶段和石英-方解石阶段。笔者对该矿床不同成矿阶段石英和方解石进行了详细的岩相学观察和显微测温研究。结果表明,该矿床的均一温度区间分别为410~440 ℃、320~350 ℃和260~320 ℃。显示早期的黄铁矿-石英阶段、石英-硫化物阶段,直到晚期的石英-方解石阶段均一温度呈现逐渐减低的趋势。根据公式计算矿床成矿深度约1.5 km,成矿压力400×105 Pa。流体沸腾作用是金属硫化物大量沉淀的主要机制。
中图分类号:
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