山东焦家金矿带深部找矿的重大突破及其意义  

GREAT PROGRESS AND FAR-REACHING SIGNIFICANCE OF DEEP EXPLORATION IN THE JIAOJIA METALLOGENIC BELT,SHANDONG PROVINCE

作　　者：宋明春[1] 崔书学 杨之利 姜洪利 杨承海 焦秀美 

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]山东省第六地质矿产勘查院,招远265400 [3]山东省地质矿产勘查开发局,济南250013

出　　处：《地质与勘探》2008年第1期1-8,共8页Geology and Exploration

基　　金：国家自然科学基金项目(编号:40672319);山东省地质矿产勘查开发局科技攻关项目资助

摘　　要：通过5年时间对山东焦家金矿带深部的地质找矿工作，发现了位于莱州寺庄矿区深部的特大型破碎带蚀变岩型金矿。该矿床与产于焦家断裂第一矿化富集带中的寺庄矿区浅部金矿床之间有100～250m垂深的无矿间隔，构成第二矿化富集带。认为胶西北地区3条主要金矿控矿断裂——三仓断裂、焦家断裂、招平断裂具有明显的相似性，形成上陡下缓的铲状断层，构成了沿玲珑花岗岩与早前寒武纪地质体边界分布的大型伸展构造带。建立了焦家式金矿新的成矿模式：在伸展构造主断面附近的岩石受到强烈的伸展剪切应力，产生倾向与伸展滑动方向一致的一系列伸展断层，构造岩为变形均匀的碎粒岩和糜棱岩，形成浸染状蚀变岩型矿石；主断面之下，由伸展引起的剪切应力，产生了具共轭剪节理性质的网状裂隙带，形成网脉状矿石；远离主断面，岩体上拱造成的引张作用产生近直立的裂隙带，形成脉状矿石。指出焦家金矿带深部成矿远景区在该断裂平面位置的西侧，而非其东侧的玲珑花岗岩分布区。Through 5 years deep exploration in the Jiaojia metallogenic belt of Shandong province, a superlarge altered rock type gold deposit, which is located in the depths of Sizhuang mining area at Laizbou city, is founded. There is 100-250m vertical interval of no ore space between newly founded deep ores and shallow ores of Sizhuang mine. h is indicated that three ore - controlling fracture zones in the northwest Jiaodong area like Sancang, Jiaojia and Zhaoping fractures are similar obviously. These shovel - like faults constitute of large - scale extensional structure along boundary of Linglong ganitoid and Preeambrian rocks. A new mineralization model for Jiaojia - type gold deposits is proposed. Rocks closed to main fracture of extensional structure underwent intense extensional shear stress. A serious of extensional extensional faults, which dip consistently with extensional slipping direction, were formed Structural rocks are eataclasite and mylonite with uniform deformation, and formed altered rock type ores. Under main fracture of extensional structure, rocks underwent shear stress due to extensional fault, consequently formed net - shaped fissure belt with conjugate joints. Network gold ores are formed. Far away from main fracture of extensional structure, rocks underwent tensile stress due to magmatic body uplift, consequently formed approximate vertical fissure belt, and formed vein gold ores （ Linglong type）.

关 键 词：焦家金矿带 深部找矿 寺庄矿区 伸展构造 

分 类 号：P618.51[天文地球—矿床学]