胶东新城金矿床黄铁矿热电性特征

新城金矿床是胶东焦家金矿田内发育的超大型破碎带蚀变岩型金矿床,黄铁矿为主要载金矿物。通过对该金矿床不同中段、不同勘探线内载金黄铁矿热电性特征的研究,厘定了黄铁矿热电导型的空间分布规律,估算了成矿温度及矿体剥蚀率,并圈定了深部找矿靶区。研究结果表明:新城金矿床载金黄铁矿热电导型以P型为主,出现率为70.20%,热电系数集中于180～320μV·℃-1,N型黄铁矿热电系数集中于-180～-80μV·℃-1;从矿体顶部到底部,Ⅰ号、Ⅴ号矿体载金黄铁矿热电导型变化规律分别为PN→NP→N→NP、P→NP,整体呈P→N,局部存在波动性;成矿温度集中于180～340℃,表明矿床为中温矿床;矿体剥蚀率为49.98%,整体剥蚀程度较低。综合分析提出149～157勘探线和181～193勘探线-630 m往深部以及161～179勘探线-730 m往深部3处找矿靶区。

Thermoelectricity Characteristics of Pyrite from Xincheng Gold Deposit, Eastern Shandong

Xincheng gold deposit,located in the Jiaojia gold field of Eastern Shandong,is a super-large altered cataclastic rock type gold deposit.Pyrite is recognized as the most important gold-bearing mineral in this depo-sit.Combined with thermoelectricity characteristics of pyrite from different depths and exploration lines of Xincheng gold deposit,the spatial distribution regularities of thermoelectric conductive type of pyrite,the mine-ralization temperature and the denudation rate of ore body are discussed in this paper,and we proposed the prospective ore area in the deeper areas.Research shows,compared to N-type(less than 30%),the thermoelectric conductive type of pyrite of Xincheng gold deposit is mainly P-type(70.20%),whose thermoelectric coefficient is 180 to 320 μV · ℃-1 and-180 to-80 μV · ℃-1 respectively;the variation trend of thermoelectric conductive type is P→N from shallow to deep areas;mineralizing temperature centers on 180 to 340 ℃,which indicates that it is a mesothermal deposit;denudation rate of ore body is 49.98%.Combined with the field geological study and the data in this paper,three ore prospective areas are proposed: depth below-630 m from 149 to 157 and from 181 to 193 exploration lines,and depth below-730 m from 161 to 179 exploration lines.