摘要
望儿山金矿床是位于山东招远-莱州金矿区西部焦家金矿田内的一个大型金矿床,矿区内断裂构造发育,总体走向为NNE-NE,其控制了矿区蚀变带的展布;矿床由石英脉型矿体和蚀变岩型矿体组成,两者均严格受断裂构造的控制。通过对望儿山金矿床的野外地质考察,根据野外观察到的构造性质、切割关系以及地质体的穿插关系认为矿区内构造-热事件时序为:①黑云母花岗岩→②花岗伟晶岩脉→③早期钾长花岗岩脉→④近EW向右行正断层和煌斑岩脉→⑤主干断裂(F1、F5、F5’)、黑云母花岗岩的热液蚀变和晚期钾长花岗岩脉→⑥近SN向逆断层、NE向平行正断层系和石英硫化物脉→⑦NW和NE向成矿后断裂以及F1、F5、F5’断裂发生左行逆断;成矿时序为:①花岗伟晶岩脉成矿→②钾长花岗岩脉成矿→③蚀变岩型矿体形成→④石英脉型矿体形成。
The Wang＇ ershan gold deposit is a large-sized gold deposit, which is located in the Jiaojia gold field west of the Zhaoyuan-Laizhou gold zone, eastern Shandong Province. In this mine area, there are well-developed faults with a general trend in NNE-NE direction. The distribution of alteration zones is controlled by the faults. The deposit is composed of altered rock-type and quartz vein-type ore bodies, which are both controlled by the faults. Based on the field geological investigation in the Wang＇ershan gold deposit, especially the fauh properties and cutting relations of geological bodies, we suggest the timing of structural-thermal events in this region is as follows ： ① biotite-granites → ② granitic pegmatite dikes → ③ early K-feldspar granite veins → ④ EW-trending dextral normal faults and lamprophyre dikes → ⑤main faults （ F1, F5 and FS＇ ）, hydrothermal alteration of biotite granites and late K-feldspar granite veins → ⑥ SN-trending thrust faults, NE-trending parallel normal faults and quartz sulfide veins → ⑦ main faults （ FI, F5 and F5＇ ） changing into left-reverse faults and post-mineralization faults. The mineralization timing is as follows ： ①mineralization in granitic pegmatite dikes → ②mineralization in K-feldspar granite veins→ ③ the formation of altered rock-type ore bodies→the formation of quartz vein-type ore bodies.
出处
《地质与勘探》
CAS
CSCD
北大核心
2011年第6期1067-1076,共10页
Geology and Exploration
基金
国家科技支撑计划课题(No.2011BAB04B09)
教育部新世纪优秀人才支持计划(No.NCET-09-0710)
教育部长江学者和创新团队(No.IRT0755)
自然科学基金项目(No.40872068和40672064)
111计划(No.B07011)资助
关键词
望儿山
金矿
热事件
成矿时序
胶东
Wang＇ ershan
gold deposit
thermal event
mineralization timing
