吉林夹皮沟金矿带黄铁矿热电性及热爆裂特征

Thermoelectric and Thermal Decrepitation Characteristics of Pyrites from Jiapigou Gold Ore Belt,Jilin Province

通过对夹皮沟金矿带主要载金矿物黄铁矿的热电性和热爆裂特征分析,确定了主成矿世代及各世代矿化类型,预测了深部探矿的可能性。黄铁矿以电子型(N型)为主,极少有空穴型(P型),N型热电系数分布于-347.3^-6.2μV.℃-1,P型热电系数介于17.4~193.5μV.℃-1,成矿温度集中于258.8~319.2℃,剥蚀率为50.260%~50.485%。爆裂曲线反映中低温(<280℃)矿化没有高温(>290℃)矿化好。综合分析认为,夹皮沟金矿带矿化分早期高温世代(热电系数峰值为-120μV.℃-1,成矿温度峰值为320℃)和晚期中低温世代(热电系数值峰值为-210μV.℃-1,成矿温度峰值为270℃)。前者包括石英脉型与蚀变岩型,在矿体走向与夹皮沟主断裂一致及相交的矿区中均有发育;后者属石英脉型,主要在矿体走向与夹皮沟主断裂相交的矿区发育,叠加于高温世代热液矿化之上。高温热液矿化世代是主成矿世代,但有叠加的部位矿化增强。

According to the thermoelectric and thermal decrepitation characteristics of pyrites,the main gold-bearing minerals in the Jiapigou gold ore belt,this article determins the main metallogenic epoch as well as the mineralization types of each epoch and discusses the possibility of prospecting to the deep.Pyrites are mainly electric conductivity N-type,with only a few hole-core P-type.Thermoelectric coefficient of N-type counts from-347.3 to-6.2 μV·℃-1,and that of P-type from 17.4 to 193.5 μV·℃-1;mineralizing temperature centers on 258.8 to 319.2 ℃;denudation rate lies between 50.260% and 50.485%.Decrepitation curves reflect that the mineralization of medium-low temperature（280 ℃） is poorer than that of high temperature（290 ℃）.The comprehensive research shows that the mineralization of Jiapigou gold ore belt includes the early high-temperature-epoch（-120 μV·℃-1 of thermoelectric coefficient and 320 ℃ of mineralizing temperature） and the late medium-low-temperature-epoch（-210 μV·℃-1 of thermoelectric coefficient and 270 ℃ of mineralizing temperature）.The former includes both quartz vein-type and alteration mineralizations,developing both where orebody trends parallel and intersect with the main Jiapigou fault.The later comprises of quartz vein-type mineralization,superposites on the former and occurs just where the orebody trend intersects with the main Jiapigou fault.The high-temperature hydrothermal mineralization epoch is the main one.However,mineralization of multi-stage superposition is enhanced.