南京大学学报(自然科学版) ›› 2018, Vol. 54 ›› Issue (2): 322.
赵丹蕾,倪 培*,朱安冬,王国光,丁俊英
Zhao Danlei,Ni Pei*,Zhu Andong,Wang Guoguang,Ding Junying
摘要: 渔塘金矿位于扬子地块和华夏地块之间的新元古代江南造山带,属于德兴大型铜金矿集区. 渔塘金矿成矿阶段石英脉中的流体包裹体可分为三类:H2O-CO2包裹体(Ⅰ型)、富CO2包裹体(Ⅱ型)和水溶液包裹体(Ⅲ型). 成矿前石英-黄铁矿脉主要含有Ⅰ型包裹体,CO2含量较为一致,均一温度为345 ℃~383 ℃,盐度为2.0 wt.%~6.5 wt.% NaCl eq.. 在金成矿期脉体中,有三种类型的包裹体,并且气相比和CO2含量变化较大,Ⅱ型包裹体的均一温度为275 ℃~314 ℃,盐度为1.8 wt.%~4.8 wt.% NaCl eq.;Ⅲ型包裹体的均一温度为278 ℃~354 ℃,盐度为4.2 wt.%~9.6 wt.% NaCl eq.;Ⅰ型包裹体的均一温度为290 ℃~363 ℃,盐度为1.0 wt.%~5.5 wt.% NaCl eq.. 成矿后石英-黄铁矿脉只包含Ⅲ型包裹体,以较低的温度和盐度为特征. 因此成矿前为高温、富CO2的富矿流体;在成矿期发生了不混溶作用,形成不同盐度的两种流体,导致流体具有较为一致的温度和不同的盐度,金主要在此阶段富集;成矿后流体具低温和贫CO2的特征. 渔塘金矿的成矿流体具有典型的不混溶特征,是典型的造山型金矿.
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