云南东川播卡金矿构造控矿规律  

Structural ore control rule for Boka Gold Mine in Dongchuan of Yunnan

作　　者：鞠昌荣[1,2] 

机构地区：[1]南京大学地球科学与工程学院,江苏南京210093 [2]江苏省有色金属华东地质勘查局,江苏南京210007

出　　处：《地质学刊》2013年第2期243-247,共5页Journal of Geology

摘　　要：播卡金矿位于云南东川,大地构造位置隶属康滇地轴中段东缘次级隆起——东川块状隆起,其东、南、西三面均为深大断裂所围限。在这个隆起带的内部分布着中元古界昆阳群巨厚的浅变质岩系,外围覆盖着震旦系及中生界、古生界。矿区构造环境隶属扬子古大陆边缘裂谷——昆阳裂谷带,带内褶皱、断裂极其发育,构造对金、铜等矿床的形成、保存以及破坏有着重要意义。小江断裂为矿区的主干断裂,控制着播卡矿田、矿床的分布格局。形成于晋宁期的F3、F4断裂与小江深大断裂平行,组成了脆韧性剪切带,为区内导矿、容矿构造。F10—F21等近东西向断裂形成于喜山期,为成矿后构造,对矿体有破坏作用。The location of Boka Gold Mine in Dongchuan of Yunnan Province was located in the second Dongchuan massive uplift in the middle of the Kangdian axis. The uplift was confined by deep faults in the east, south and west, respectively. Very thick epimeta morphic rock series of mesoproterozoie Kunyang Group occurred dominantly within the uplift, whereas Sinian, Paleozoic and Mesozoic strata were distributed in the periphec~. The tectonic environment in the ore distric, t belonged to Kunyang rift zone in Yangtze ancient continental marginal rift. The faults and folds were extremely developed in the rift. Structure played an important role for the formation, reservation and destruction of Au and Cu deposits. Xiaojiang fault was the main fault in the ore district, it controlled the distribution style of Boka or field and ore deposit. The F3 and F4 faults formed during Jinnin period were parallel to Xiaojiang deep fault. These faults formed brittle ductile shear zone and were mainly conductive and host structures for the deposits. The F10 to F21 faults of east-westward strike were formed during Xishan period, and were post metallogenic structures and of destructive effect for the ore bodies.

关 键 词：金矿 控矿构造 破碎带 云南东川 

分 类 号：P618.51[天文地球—矿床学]