CAJ | 학술논문

湘西-黔东下寒武统铅锌矿床位于湘西-鄂西成矿带西南部湘黔边境地区，是一类产于寒武系清虚洞组藻灰岩中的铅锌矿床。对李梅、狮子山、嗅脑、卜口场4个矿床开展了流体包裹体及硫、铅、碳同位素地球化学分析，分析结果表明：铅锌矿石流体包裹体具有低温、中-高盐度特点；硫化物δ34S值较高；围岩及方解石的δ13C、δ18O组成均为正常海相碳酸盐的碳、氧同位素组成；矿石与围岩的铅同位素组成变化范围不大，所有铅同位素数据在207 Pb/204 Pb-206 Pb/204 Pb图中呈线性分布。综合分析认为，湘西-黔东下寒武统铅锌矿床成矿流体可能为区域迁移流体与地层封存水构成的混合流体，成矿物质大部分来源于碳酸盐岩围岩地层，可能有部分Pb、Zn等金属元素随区域迁移流体带入，矿床的形成可能为两种来源流体混合后Pb、Zn等金属元素因物理化学条件的改变而沉淀成矿，矿床成因类型应为密西西比型铅锌矿床。
상서-검동하한무통연자광상위우상서-악서성광대서남부상검변경지구，시일류산우한무계청허동조조회암중적연자광상。대리매、사자산、후뇌、복구장4개광상개전료류체포과체급류、연、탄동위소지구화학분석，분석결과표명：연자광석류체포과체구유저온、중-고염도특점；류화물δ34S치교고；위암급방해석적δ13C、δ18O조성균위정상해상탄산염적탄、양동위소조성；광석여위암적연동위소조성변화범위불대，소유연동위소수거재207 Pb/204 Pb-206 Pb/204 Pb도중정선성분포。종합분석인위，상서-검동하한무통연자광상성광류체가능위구역천이류체여지층봉존수구성적혼합류체，성광물질대부분래원우탄산염암위암지층，가능유부분Pb、Zn등금속원소수구역천이류체대입，광상적형성가능위량충래원류체혼합후Pb、Zn등금속원소인물이화학조건적개변이침정성광，광상성인류형응위밀서서비형연자광상。
The western Hunan-eastern Guizhou area is an important Pb-Zn polymetallic ore district,some of which hosted in the algal limestone of the Lower Cambrian Qingxudong Formation.In this study,fluid inclusions and S,Pb,C isotope compositions were studied for four typical Pb-Zn deposits (Limei,Shizishan,Xiunao and Pukouchang)hosted in the Qingxudong Formation.The results show the ore-forming fluid with low temperature and medium to high salinity.The δ34 S values of sulfides are high.The δ1 3 C and δ1 8 OV-SMOW values of wall-rock and calcite show the same characteristic with the normal marine carbonate.The Pb isotope of the wall-rocks and ore have a little variation scope,showing the linear distribution in the 207 Pb/204 Pb -206 Pb/204 Pb diagram.Our results indicated that ore-forming materials of the Pb-Zn deposits in the western Hunan-eastern Guizhou area mostly derived from the carbonate wall-rocks.Meanwhile,migrating fluid added Pb,Zn materials to the depo-sits as well.Pb,Zn and associated minerals were precipitated due to the changes of the physical and chemical conditions,resulted from mixing of two sources,indicating that the genesis type of our studied deposits is the Mississippi Valley-type (MVT)lead-zinc deposit.