胶东西北部金矿床深部资源潜力与找矿方向  

Deep Prospecting Potential of Gold Deposits in the Northwestern Jiaodong Peninsula and Their Ore-Search Direction

作　　者：郭春影[1,2,3] 张文钊[1] 葛良胜[1] 卿敏[1] 高帮飞[2,3,4] 王长明[2,3] 夏锐[1,2,3] 

机构地区：[1]中国人民武装警察部队黄金地质研究所,河北廊坊065500 [2]中国地质大学(北京)地质过程与矿产资源国家重点实验室,北京100083 [3]中国地质大学(北京)岩石圈构造、深部过程及探测技术教育部重点实验室,北京100083 [4]中铁资源集团有限公司,北京100055

出　　处：《地质与勘探》2012年第1期58-67,共10页Geology and Exploration

基　　金：国家自然科学基金项目(编号40872068、40572063、40672064和40872194);高等学校学科创新引智计划(编号B07011);地质过程与矿产资源国家重点实验室开放课题(GPMR0732、GPMR200833)联合资助的成果

摘　　要：结合胶东地区近年来金矿勘查的重大突破,通过对控矿断裂构造网络、成矿流体来源、成矿深度估算和剥蚀程度的综合分析,认为胶东地区具有良好的区域金成矿地质条件和深部找矿前景。胶东地区具有三山岛、焦家、招平3条主要的控矿断裂和众多次级断裂,构成成矿流体活动和金矿床就位的构造网络。成矿流体具有壳幔混合特征,暗示成矿作用深部延伸潜力可观。近年来的勘查实践已经发现众多深部资源,证明胶东地区深部找矿切实可行。通过流体包裹体压力和花岗岩形成深度综合分析,认为胶东金矿床成矿深度上限为2～3km,成矿深度下限5～8km,后期剥蚀程度不超过3km,因此区域上3km以浅甚至5km以浅均具有找矿前景。三山岛断裂与焦家断裂深部可能在4km左右深度交汇,其交汇部位可能发育隐伏的巨型金成矿带。Based on breakthrough in deep gold prospecting in the northwestern Jiaodong Peninsula, comprehensive analyses of regional ore-controlling fault networks,ore-forming fluid origin,ore precipitation depth and subsequent denudation depth indicate good metallogenie conditions for gold deposits and a fairly good ore-search potential. There are 3 main ore-controlllng faults, i. e. , the Sanshandao, Jiaojia and Zhaoping faults, and many secondary faults,forming a tectonic network for ore forming fluid transportation and gold precipitation. The ore-forming fluid shows characters of crust-mantle mix- ture, which implies that these faults have great continuity downward at depth. Recent exploration work has discovered several orebodies at depth. This fur- ther proves the possibility of gold exploration at depth in the Jiaodong Peninsula. Comprehensive interpretation of pressure estimation from fluid inclusions and the formation depth of regional granite intrusions suggests that the upper formation limit of gold deposits is 2 ~ 3km, and the lower limit is 5 ~ 8kin, with erosion depth less than 3km. Therefore,great gold prospecting potential is expected to be as deep as 3kin and even 5kin in this area. The Sanshandao fault and the Jiaojia fault likely intersect at about 4km depth where a huge gold deposit belt probably is present.

关 键 词：深部找矿 成矿深度 剥蚀程度 胶东西北部 

分 类 号：P618.51[天文地球—矿床学]