介于岩浆岩型与剪切带型之间的脉状钨锡矿床--广西珊瑚钨锡矿床新认识  

A kind of tungsten-tin vein deposit between magmatic rock type and shear zone type——New acknowledge on Shanhu tungsten-tin deposit in Guangxi

作　　者：韦安伟 汪劲草[1,2] 莫志明 张知春 严小敏 程雄卫[1,2] 王永东[1,2] 李庚华 

机构地区：[1]桂林理工大学广西矿冶与环境科学实验中心 [2]桂林理工大学广西隐伏金属矿产勘查重点实验室,广西桂林541004 [3]广西地质勘查总院,南宁530023 [4]广西机电工业学校,南宁530023 [5]广西地质矿产勘查开发局二七一地质队,广西桂林541100

出　　处：《桂林理工大学学报》2015年第1期8-14,共7页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(41172089);广西自然科学基金项目(桂科自0832251;2012GXNSFAA053185;2014GXNSFAA118281);广西自治区第一批、第二批大规模地质矿产勘查科研子项目

摘　　要：通过对广西珊瑚钨锡矿床矿脉的结构与构式研究,认为该矿床属"岩浆岩型"与"剪切带型"脉状矿床的过渡类型。早期,矿床受逆-平移脆-韧性剪切带控制,其初始破裂体系在平面上呈左行雁列,在横剖面上呈正花状构造;晚期,由于岩浆矿液的大量喷涌,早期破裂体系中的流体压力剧增,导致矿脉扩展由构造致裂转变为流体致裂,矿脉呈现树型分叉。矿脉分维值为1.39,其值介于流体型破裂与构造型破裂之间。根据珊瑚钨锡脉状矿床的新构造模型,认为该矿床F1断层东侧深部具有很大的找矿潜力。Studies of the configuration and structural style on the ore-veins in Shanhu tungsten-tin deposit sug-gests that a kind of tunsten-tin vein deposit locates and belongs to the transition pattern between magmatic rock type and shear zone type.In the early stage,this deposit is controlled by a strike slip brittle-ductile shear zone with thrust component,in which initial fracture system is characterized by sinistral echelon in a plane and posi-tive flower-structure in a profile.In the late stage,huge spewing of magmatic ore-fluid leads to the fluid pres-sure in the initial fractures increasing considerably,the ore-vein propagation results from tectonic fracturing to hydro-fracturing,and the ultimate appearance of a branch-like structure.The fractal dimension of the vein dis-tribution is 1.39,between fluid type fracture and tectonic type fracture.A new tectonic model of Shanhu tung-sten-tin vein deposit indicates that vast range of prospects in the deep part locates at the east side of fault F1 .

关 键 词：脉状矿床 流体致裂 构造致裂 花状构造 珊瑚钨锡矿床 

分 类 号：P618.401[天文地球—矿床学] P613[天文地球—地质学]