摘要
玛尔卡库里地区发育一条北西向大型韧性剪切带,构成阿尔泰构造带南缘的重要控矿结构。金矿体主要赋存在剪切带主干断裂及应变集中带中,表现出脉状、透镜状及蚀变岩型多样组合特征。40Ar/39Ar、Re-Os与U-Pb等多源定年结果表明成矿作用集中于晚二叠世至早三叠世,发生于剪切带由韧性向脆性转化的构造窗口期。成矿流体具有中温、中盐度、含CO_(2)等特征,同位素数据揭示其来源为岩浆—变质流体混合体系,蚀变带分布与高品位矿体密切重叠,体现出显著的构造-热液-成矿协同演化关系。
The Markakuli area hosts a large NW-trending ductile shear zone,which serves as a major ore-controlling structure along the southern margin of the Altay orogenic belt.Gold orebodies are primarily hosted within the main shear zone faults and strain concentration zones,displaying a diverse assemblage of vein-type,lens-type,and alterationtype mineralization.Multi-method geochronology,including^40Ar/^39Ar,Re-Os,and U-Pb dating,indicates that mineralization occurred mainly from the Late Permian to Early Triassic,coinciding with the transitional phase of the shear zone from ductile to brittle deformation.The ore-forming fluids are characterized by medium temperature,moderate salinity,and CO_(2) content.Isotopic data suggest a mixed magmatic-metamorphic fluid origin.The spatial overlap between alteration zones and high-grade orebodies reflects a strong coupling between structural deformation,hydrothermal activity,and mineralization.
作者
包中林
BAO Zhong-lin(Jingning County,Gansu Province,Altay 836700,China)
出处
《世界有色金属》
2025年第20期59-61,共3页
World Nonferrous Metals
关键词
剪切带控矿
热液成矿
金矿床
地球化学
shear zone-controlled mineralization
hydrothermal mineralization
gold deposit
geochemistry
