南京大学学报(自然科学版) ›› 2018, Vol. 54 ›› Issue (2): 351.
顾建峰1,2,倪 培1*,李文生1,王国光1,潘君屹1,刘 政1
Gu Jianfeng1,2,Ni Pei1*,Li Wensheng1,Wang Guoguang1,Pan Junyi1,Liu Zheng1
摘要: 安徽马头钼矿床位于长江中下游成矿带的安庆-贵池矿集区内,矿体主要赋存在花岗闪长斑岩中,其矿化类型由浅部石英脉型和深部细脉浸染型矿体组成. 其中,浅部蚀变以绢英岩化和青磐岩化为主,钾化和碳酸盐化相对较弱,深部蚀变主要为强钾化和少量硅化. 成矿流体研究结果表明,该矿床浅部主要为Ⅰ型水溶液包裹体,而深部则包含Ⅰ型水溶液包裹体、Ⅱ型富CO2包裹体和Ⅲ型含CO2包裹体. 浅部Ⅰ型包裹体均一温度集中在224 ℃~283 ℃,盐度在3.8 wt.%~7.6 wt.% NaCl之间;深部Ⅰ型和Ⅱ型包裹体均一到液相,其均一温度分别集中在263 ℃~316 ℃和311 ℃~331 ℃,盐度分别为5.1 wt.%~10.3 wt.% NaCl和0.6 wt.%~2.0 wt.% NaCl,Ⅲ型包裹体均一温度为335 ℃~362 ℃,盐度为2.7 wt.%~6.7 wt.% NaCl. 深部大量Ⅰ型与Ⅱ型、Ⅲ型包裹体共生在同一石英颗粒中,均一温度相近,均一方式不同,表明深部细脉浸染型成矿作用过程中可能有流体不混溶作用发生,导致CO2逃逸,流体性质改变致使Mo等成矿物质的沉淀. 本研究发现NaCl-H2O-CO2体系流体不混溶为马头钼矿床属于斑岩型矿床提供了新的地质地球化学证据.
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