【摘要】 该矿床位于华北地台区北缘内侧。矿床围岩以中元古界高于庄组白云岩为主。岩浆岩主要是矿区东部的黑云母石英二长岩。从南东往北西,矿体划分为北山、红旗、炉沟、东风、冰沟五个矿段。 白云岩碳、氧同位素组成的研究表明,矿区白云岩是海相沉积碳酸盐。在其形成之后,由于燕山期黑云母石英二长岩的侵入和相应的热变质作用,使部分白云岩的δ¹⁸O和δ¹³C值显著降低。在热液成矿作用过程中,由于大气降水的混入,同样会导致白云岩的δ¹⁸O和δ¹³C值降低。燕山期黑云母石英二长岩的侵入及岩浆热液作用对八家子铅锌矿的形成起了重要作用。更多还原

【Abstract】 The deposit is located in the North margin of North-China Platform. The country rock of the orebody are dolomites of Gaoyuzhuang Formation(Middle Proterozoic era). Biotite quartz monzonite, cropping out east of the ore district, is the main intrusion. From southeast to northwest, the deposit is devided into five ore blocks, that is Bei-shan-Hongqi-Lugou-Dongfeng-Bingou.Through careful analyses of carbon and oxygen isotope compositions of dolomites, we come to conclusions as following.The dolomites in the district are marine sedimentary carbonates. After deposition, the δ18O & δ13C values of some dolomites were decreased because of the magmatism, metasomatism and hydrothermalism of Yanshanian Orogeny. The contamination of 18O-poor meteoric water to hydrothermal ore fluids also caused theδ18O & δ13C decreasion of dolomites. The intrusion of biotite quartz monzonite and subsequent hydrothermalism played an important role in the ore formation.更多还原