陕南汉阴黄龙金矿脆——韧性剪切带特征及其对成矿的控制作用  

Characteristics of Brittle-ductile Shear Zone and Its Control Effect on Gold Mineralization in the Huanglong Gold Deposit,Hanyin,South Shaanxi Province

作　　者：韩珂[1] 杨兴科[1] 张健[1] 胡国朝 

机构地区：[1]长安大学地球科学与资源学院,陕西西安710054

出　　处：《黄金科学技术》2017年第5期18-29,共12页Gold Science and Technology

基　　金：中国地质调查局项目"陕西石泉-旬阳金矿整装勘查区关键基础地质研究"(编号:12120114014201);中央高校基本科研业务费专项"矿田构造与找矿预测"(编号:310827153408)联合资助

摘　　要：黄龙金矿位于南秦岭石泉—神河韧性滑脱逆冲推覆带,矿区内主要出露下志留统梅子垭组一套变形变质岩,岩性主要为绢云石英片岩,岩层经历了多期构造变质变形,控矿构造和矿化蚀变较复杂,区内岩浆岩不发育。经野外调研发现,矿区内岩石片理化、褶皱变形和断层等构造发育,表明矿区内岩石地层经历过强烈的韧性剪切作用。通过对脆—韧性剪切带进行宏观和微观研究,依据矿区内构造(断层、褶皱、岩石片理化和糜棱岩化等)发育程度、规模和密度等标志,在黄龙矿区划分出3条次级脆—韧性剪切带,共同构成了控制黄龙金矿产出的区域脆—韧性剪切带RF4(DSZ2)。RF4(DSZ2)脆—韧性剪切带整体走向NW,与各矿段金矿体产状基本一致。研究认为,脆—韧性剪切带是黄龙金矿的重要控矿要素,黄龙金矿具有韧性剪切带型金矿特有的垂向矿化分带特征。Huanglong gold deposit is located in Shiquan-Shenhe ductile decollement thrust-nappe belt of South Qinling.There is a set of deformed metamorphic rocks of the Lower Silurian Meiziya Formation （S1m） in the mine area,mainly with sericite quartz schist,which has undergone many stages of structural deformation and metamorphism.The ore-controlling structure,alteration and mineralization are complex,and the magmatic rocks aren＇t developed in this area.Based on the field investigation,the development of rock schistosity, fold deformation and faults in the mine area indicates that the rocks have experienced strong ductile shearing.According to the development degree, scale and density of structures （faults, folds, rock schistosity and mylonitization） in the mine area, three brittle-ductile shear zones with strong deformation can be identified.These three brittle-ductile shear zones constitute the regional brittle-ductile shear zone RF4 （DSZ2）, and tending NW, which are consistent with gold orebodies in each section.Through comprehensive study,it is believed that the brittle-ductile shear zone is an important metallogenic mechanism and ore-controlling factor of Huanglong gold deposit,the mineralization type of the mine has the characteristics of vertical mineralization zonation of the ductile shear zone gold deposit.

关 键 词：控矿构造 脆—韧性剪切带 S2面理 黄龙金矿 南秦岭 

分 类 号：P618.51[天文地球—矿床学]