老挝川圹省BanDa锡多金属矿床地质特征及找矿标志  

Geological characteristics and prospecting signs of BanDa tin polymetallic deposits in Xiengkhouang Province,Laos

作　　者：罗达 康铁锁 史琪 赵毅 赵延朋 邹先文 陆少华 LUO Da;KANG Tiesuo;SHI Qi;ZHAO Yi;ZHAO Yanpeng;ZOU Xianwen;LU Shaohua(China Nonferrous Metals(Guilin)Geology and Mining Co.,Ltd.,Guilin 541001,China)

机构地区：[1]中国有色桂林矿产地质研究院有限公司,广西桂林541001

出　　处：《中国矿业》2024年第S02期500-505,共6页China Mining Magazine

基　　金：广西科技基地和人才专项资助(编号:桂科AD24010023);广西重点研发计划项目资助(编号:桂科AB24010058);企业创新基金项目资助(编号:KDYCXJJ202111)。

摘　　要：BanDa锡多金属矿床位于长山成矿带西北段,为近年来新发现的一处中型锡多金属矿床,随着勘查的深入有望突破为大型锡多金属矿床。现阶段矿体主要赋存于二叠系Khang Khai组泥质粉砂岩、粉砂质泥岩中的近SN向构造破碎带和层间破碎带中,矿体的产状、空间分布及形态特征严格受NE向断裂、近SN向断裂和层间破碎带的联合控制。矿体主要呈脉状、细网脉状、条带状、蜂窝状在断裂带和层间破碎带中产出,矿体沿走向和倾向变化较大,具分支复合、尖灭再现和尖灭侧现等现象。矿体中矿石矿物以锡石为主,其次为闪锌矿和黄铜矿,矿石结构以它形-半自形粒状结构为主,矿石构造以浸染状构造为主,认为该矿床为构造-热液充填交代型锡多金属矿床。厘定了五大找矿标志:露头标志、岩性标志、构造标志、围岩蚀变标志及地球物理-地球化学标志等,为下一步矿床深边部找矿勘查和长山成矿带西北段锡多金属矿找矿勘查起指导作用。BanDa tin polymetallic deposit is located in the northwestern part of the Changshan metallogenic belt,which is a medium-sized tin polymetallic deposit newly discovered in recent years,and is expected to break through to a large-sized tin polymetallic deposit with the deepening of the exploration.At this stage,the ore body is mainly deposited in the nearly SN-oriented tectonic fracture zones and interlayer fracture zones in the muddy siltstone and silty mudstone of Khang Khai Formation of the Permian System,and the production,spatial distribution and morphological characteristics of the ore body are strictly controlled by the joint control of NE-oriented fracture,nearly SN-oriented fracture and interlayer fracture zones.The ore body is mainly vein-like,fine net vein-like,strip-like,honeycomb-like in the fracture zone and interlayer fracture zone,the ore body along the course and tendency of the change is large,with branching composite,cusp extinction reappearance and cusp extinction of the side of the phenomenon.The ore body is dominated by cassiterite,followed by sphalerite and chalcopyrite,and the ore structure is dominated by other-autogenous granular structure,and the ore structure is dominated by dipping structure,which makes the deposit a tectonic-hydrothermal filling and accounting type tin polymetallic deposit.The deposit is considered to be a tectonic-hydrothermal filling and accounting type of tin polymetallic deposit,and five major ore searching markers have been identified:outcrop marker,lithological marker,tectonic marker,peripheral rock alteration marker,and geophysical and geochemical markers,which will play a guiding role for the next step of the ore searching and exploration in the deep part of the deposit,and for the searching and exploration for tin polymetallic ores in the northwest section of the Changshan metallogenic belt.

关 键 词：锡多金属矿床 地质特征 找矿标志 长山成矿带 老挝川圹省 

分 类 号：TD12[矿业工程—矿山地质测量] P632[天文地球—地质矿产勘探]