西秦岭马坞金矿床韧性剪切带构造控矿特征  

Ore-controlling Characteristics of Ductile Shear Zone Structure in Mawu Gold Deposit,Western Qinling

作　　者：曹东宏 崔龙[1] 辛晓军 朝银银[1] CAO Donghong CUI Long XIN Xiaojun CHAO Yinyin(No.5 Gold Geological Party of CAPF, Xi ＇ an 710100, Shaanxi, China)

机构地区：[1]武警黄金第五支队,陕西西安710100

出　　处：《黄金科学技术》2016年第6期24-31,共8页Gold Science and Technology

基　　金：中国地质调查局地质调查子项目"甘肃岷县寨上-马坞金矿整装勘查区专项填图与技术应用示范"(编号:1210114050301)资助

摘　　要：马坞金矿床位于西秦岭礼(县)—岷(县)成矿带西段,是近年发现的一个中型微细浸染型金矿床。矿体产出受NWW向脆韧性剪切带控制,赋矿围岩为中泥盆统何家店组千枚岩与灰岩。马坞金矿床成矿构造以剪切动力系统为主导因素,次级韧—脆性剪切构造控制着金矿化蚀变带和矿体的产出,地层和岩石构造的韧性剪切变形变质特征非常典型,从矿源层、流体性质及来源、矿体形态和矿石类型等方面来看,均体现了韧性剪切带型金矿的特征。在"富金地层—剪切带—岩浆活动"三位一体联合作用下形成中低温微细浸染型矿床,矿体被剥蚀到中部偏下部位,向深部仍有一定规模的延伸。Mawu gold deposit is a medium-sized fine disseminated gold deposit discovered in recent years,located in western segment of Western Qinling Li-Min metallogenic belt.The orebody is controlled by NWWtrending faults, with the wall rocks consisting of phyllite and limestone in Hejiadian Group of Middle Devonian.The shear dynamic system is the leading factor of metallogenic structure in Mawu gold deposit ,ithe secondaryductile-brittle shear structure of the deposit controlled the occurrence of gold mineralization alteratioh zones andthe orebody.The ductile shear deformation and metamorphism characteristics of the strata and rocks are verytypical.The source bed,fluid nature and origin,orebody morphology and ore types were reflected thecharacteristics of ductile shear zone type gold deposit.Under the combined effect of trinity ＂gold-rich strata, shearzone, magmatic activity＂, formed low temperature micro-disseminated-type deposits.The orebody was eroded to Lthe middle position and downwards, there was still some scale extends to the deep.

关 键 词：韧性剪切带 构造控矿 马坞金矿床 西秦岭 

分 类 号：P618.51[天文地球—矿床学]