摘要
新地沟金矿是华北地台北缘大青山段绿岩型金矿的代表性矿床,矿体主要产于上太古界色尔腾山岩群绿片岩组合中的蚀变糜棱岩带中。矿石类型有:蚀变糜棱岩、千糜岩、石英脉等。主要蚀变为硅化、钾化、黄铁矿化、绢云母化。矿体与围岩糜棱面理产状基本一致,绿片岩为矿源层。影响成矿的主要因素是两期不同层次的韧性剪切变形变质作用和早期同构造侵位的晚太古代二长花岗岩。矿床形成是上述地质事件综合作用的产物。显生宙以来的花岗岩侵位对成矿影响不大,基底硬化后脆性断裂对矿体起破坏作用。
Xindigou gold deposit is a typical greenstone gold deposit in Daqing shan part on the north ridge of North China Platform. Its ore body mainly occurs in altered mylonite zone of greenschist compound in Upper Archean Sertengshan Group. The type of the ore is altered mylonite, phyllonite and quartz vein and others. Silicification, potassic alteration, pyritization and sericitization are main alterations for the gold deposit. The ore body is basically concordan with attitude of mylonite faliation of its host rock. Greenschist is its source bed. Main metallogenic factors are the ductile sheared deformation and metamorphization of two stage, and the Upper Archean monzonitic granite which intruded simultaneous with the early stage tectonic deformation. The gold deposit is the compounding result of the above discussed geological events. Granite emplacement has little effect on oreformation since Phanerozoic. After basement hardened,brittle fractures had destructive effect on the ore body.
出处
《内蒙古地质》
2002年第4期1-7,共7页
Geology of Inner Mongolia
关键词
金矿
绿片岩
韧性剪切变形
新地沟
golddeposit
greenschist
ductile sheared deformation
Xindigou
