伏牛山付店地区钼铅锌矿田成矿物质来源及成矿模式

Ore-forming material sources and metallogenic model of Mo-Pb-Zn ore field in Fudian area of Funiu Moutain

东秦岭伏牛山山脉东段付店地区钼铅锌矿田是河南省重要的矿产基地,高温钼矿与中温铅锌矿在剖面上构成一个完整的成矿系统。钼矿成矿物质来源第一矿源层是太古界太华群中深变质岩系,第二矿源层是中元古界熊耳群底部火山岩系包括王屋山期石英二长岩系;据对太山庙燕山期花岗岩基和东沟花岗斑岩株的岩石学、岩石化学及岩石地球化学等方面测试发现,花岗岩演化结果富含钼质但不含铅锌,而石英二长岩类铅锌丰度值为最高。得出的结论为:由燕山期白垩纪花岗斑岩熔融太古界和熊耳群底部地层提供了成钼物质;石英二长岩经花岗岩浆熔融提供了铅锌物质。燕山期花岗岩浆活动为钼铅锌矿田提供了超高温超高压的成矿环境,通过熔融不同的含矿地质体储备了不同的矿物质,形成了不同的矿床。这就是建立矿田成矿模式的条件。

Mo-Pb-Zn ore field in Fudian area of Funiu Mountain at East Qinling is an important mineral resource base in Henan.The high-temperature molybdenum ores and mesothermal lead-zinc ores constitute a complete metallogenic system on the profile.In terms of the ore-forming material sources of molybdenum ores,the first source bed is mesometamorphic rock series in Archaean Taihua Group and the second source bed is volcanic series at the bottom of Mesoproterozoic Xiong＇er Group which includes adamellite series of Wangwushan period.According to the test on the petrology,petrochemistry and petrogeochemistry of Taishanmiao-Yanshanian granite batholiths and Donggou Granite porphyry stocks,the results indicated that after evolution the granite contained rich molybdenum and no lead and zinc,but adamellite had the highest lead and zinc abundance.This indicates that molybdenum-forming materials are provided by Archean group and the bottom strata of Xiong＇er Group melted by Yanshanian Cretaceous granite porphyry,while lead-zincforming materials are from adamellite melted by granitic magma.Yanshanian granitic magma activities create a superhigh temperature and ultrahigh pressure environment for the ore-forming of Mo-Pb-Zn ore field.Through melting of different ore-bearing geologic bodies different mineral materials are reserved and form different deposits.This is the condition of the metallogenic model of the ore field.