胶东新城金矿床黄铁矿热电性特征  

Thermoelectricity Characteristics of Pyrite from Xincheng Gold Deposit, Eastern Shandong

作　　者：戢兴忠[1] 杨立强[1] 王中亮[1] 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室,北京100083

出　　处：《现代地质》2013年第1期37-45,共9页Geoscience

基　　金：国家科技支撑计划课题(2011BAB04B09);国家自然科学基金项目(41230311;40672064;40872068);教育部新世纪优秀人才支持计划项目(NCET-09-0710);高等学校学科创新引智计划项目(B07011);教育部长江学者和创新团队发展计划项目(IRT0755)

摘　　要：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。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 pro- spective ore area in the deeper areas. Research shows, compared to N-type （less than 30% ）, the thermoelec- tric conductive type of pyrite of Xincheng gold deposit is mainly P-type （70.20%） , whose thermoelectric coeffi- cient is 180 to 320μV·℃^-1 and - 180 to -80μV·℃^-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 geo- logical 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.

关 键 词：胶东 新城金矿床 黄铁矿 热电性 成矿预测 

分 类 号：P578.292[天文地球—矿物学] P574.19[天文地球—地质学]