CAJ | 학술논문

桂北老堡铅锌矿床位于扬子地台前寒武地块前陆盆地边缘的正向构造带上,产于震旦系陡山沱组白云岩和老堡组硅质岩中.矿石矿物成分简单,主要由闪锌矿、方铅矿、黄铁矿及少量黄铜矿等硫化物组成;脉石矿物主要由白云石、方解石、石英及少量绢云母、绿泥石等矿物组成.石英流体包裹体均一温度变化在115～270 ℃,盐度在(w(NaCl))3.8%～5.8%.流体包裹体的气液相成分显示,成矿流体富含CO2、CH4、C2H6,其中的w(Na+)/w(K+)、w(Cl-)/w(F-)较高,且w(Na+)＞w(K+)＞w(Ca2+)＞w(Mg2+).矿体中黄铁矿的δ34S为12‰～21‰.与闪锌矿共生的石英的δ18O为16.0‰～18.4‰,其中的流体包裹体δD为-58‰～-61‰.地质和地球化学特征表明,老堡为由热卤水与变质水或建造水混合的MVT型铅锌矿.
계북로보연자광상위우양자지태전한무지괴전륙분지변연적정향구조대상,산우진단계두산타조백운암화로보조규질암중.광석광물성분간단,주요유섬자광、방연광、황철광급소량황동광등류화물조성;맥석광물주요유백운석、방해석、석영급소량견운모、록니석등광물조성.석영류체포과체균일온도변화재115～270 ℃,염도재(w(NaCl))3.8%～5.8%.류체포과체적기액상성분현시,성광류체부함CO2、CH4、C2H6,기중적w(Na+)/w(K+)、w(Cl-)/w(F-)교고,차w(Na+)＞w(K+)＞w(Ca2+)＞w(Mg2+).광체중황철광적δ34S위12‰～21‰.여섬자광공생적석영적δ18O위16.0‰～18.4‰,기중적류체포과체δD위-58‰～-61‰.지질화지구화학특정표명,로보위유열서수여변질수혹건조수혼합적MVT형연자광.
Laobao Pb-Zn deposit is located in the forland basin margin of the Precambrian massif,controlled by lithology and stratiform.The ore mineral is simply composed of sphalerite,galena,pyrite with minor chalcopyrite.The gangue minerals consist of dolomite,cacite,quartz,sericite and chlorite.The homogenous temperatures of fluid inclusion in quartz range from 115 to 270 ℃ with salinity of 3.8%-5.8%.The compositions of fluid inclusion in quartz are rich in CO2,CH4,C2H6 with high w(Na+)/w(K+),w(Cl-)/w(F-)ration and w(Na+)＞w(K+)＞w(Ca2+)＞w(Mg2+).Sulfur isotope of pyrite in ore ranges from 12‰ to 21‰.The oxygen isotope and hydrogen isotope in quartz and fluid inclusions are from 16.0‰ to 18.4‰,from -58‰ to -61‰,respectively.It is suggested that Laobao Pb-Zn deposit has characteristics of MVT type deposit,and its fluids are derived from brine or formation water.