【摘要】 内蒙古赤峰地区少朗河成矿带受华北板块、西拉沐沦河断裂、赤峰-开源断裂以及嫩江断裂的影响,在中生代时期火山活动及成矿作用强烈且复杂。黄花沟矿床是少朗河成矿带中典型的Pb-Zn-Ag多金属矿床,矿体主要赋存在晚古生代与中生代的火山熔岩及火山碎屑岩中。根据空间产状可将矿体划分为2种类型:1)充填到火山口放射性裂隙中的脉状矿体;2)存在火山通道中的角砾状矿体。显微镜下鉴定、能谱及电子探针微区成分分析显示,该矿床主要矿石矿物为方铅矿、闪锌矿、黄铁矿、硬锰矿等,此外尚有少量的菱锰矿、软锰矿、辉银矿和黄铜矿。主要蚀变矿物组合为石英-玉髓、冰长石-伊利石-绢云母、重晶石-萤石、菱铁矿-菱锰矿。矿石呈脉状、网脉状、条带状、浸染状、栉状、似层纹状及角砾状等构造类型,矿体与围岩之间多数为交代渐变关系,少数呈脉状充填。矿石矿物及蚀变围岩组合特点显示,该矿床具有低硫化型浅成低温热液矿床的矿化特点,结合前人成果,推测该矿床可能为浅成低温热液成因。更多还原

【Abstract】 The Mesozoic volcanic activity and metallogenesis occurred strongly and complicatedly in the Shaolanghe metallogenic belt of the Chifeng area in Inner Mongolia, as the belt was influenced by the North China Plate, the Xilamulun River Fault, the Chifeng-Kaiyuan Fault and the Nenjiang Fault. The Huanghuagou deposit is a typical Pb-Zn-Ag polymetallic deposit in the Shaolanghe metallogenic belt. The ore bodies are mainly hosted in the Late Paleozoic and Mesozoic volcanic lavas and pyroclastic rocks. According to the spatial distribution, ore bodies of the deposit can be classified into two types: 1) The vein-type orebody filling into radial fissures/fractures in volcanic crater; 2)The breccia-type orebody existed in the volcanic vent. Microscopic observation, EDS and electron microprobe micro analysis(EPMA) show that main metallic minerals of the deposit include galena, sphalerite, pyrite, psilomelane, etc., with minor rhodochrosite, pyrolusite, argentite and chalcopyrite. The main alteration mineral assemblages are quartz-chalcedony, adularia-illite-sericite, barite-fluorite, and siderite-rhodochrosite. Ores have veining, stockwork,banded, disseminated, pectinating, lamellar and brecciated structures, etc. There is mainly metasomatic gradient relationship between orebodies and wallrocks, with minor crosscutting relation by the vein. The characteristics of metallic minerals and altered wall rocks show that the deposit is characterized with those of the low sulfidation epithermal deposit. Combining with previous achievements, it is inferred that the deposit may be of epithermal genesis.更多还原