山东烟台岔夼金锑矿床地质特征及成因探讨

Geological characteristics and genesis of Chakuang Gold-Antimony Deposit in Yantai,Shandong Province

岔夼金锑矿床是胶东地区新发现的首例金锑共生矿床,金锑矿体赋存于近南北向断裂构造破碎带中,围岩为新太古代TTG岩系和古元古界荆山群片岩系,含锑矿物为辉锑矿,围岩蚀变以硅化、黄铁矿化、绢云母化、碳酸盐化为主。流体包裹体、硫同位素分析结果表明,成矿流体为中低温、中低盐度、中低密度的NaCl-H_2O-CO_2流体体系,成矿物质来源于深源及TTG岩系和荆山群地层,成矿深度为浅成。初步认为,矿床成因为中低温热液脉型金锑矿床,成矿时代为中生代燕山期。

Chakuang Gold -Antimony Deposit is the first gold and antimony intergrowth deposit that is newly discovered in Jiaodong region. The gold - antimony ore body is hosted in near SN fault structural fracture zone, the sur- rounding rocks belong to Neo-Archean TTG rock system and Palaeoproterozoic Jingshan group schist system, the antimony-bearing minerals are stibnite, the surrounding rock alteration is mainly silicification, pyritization, sericitization and carbonitization. Analysis of fluid inclusion and sulfur isotopes shows that the ore-fornfing fluids are medium-low temperature, medium-low salinity, medium-low density NaCl- H2O- CO2 fluid system, ore-forming materials originate from deep source and the strata form TTG rock system and Jingshan group, and the ore-forming depth is hypabyssal.Preliminary analysis takes that the deposit genesis is medium-low hydrothermal fluid gold -antimony deposit and the mineralization period is Mesozoic Yanshanian period.