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胶东剪切带型金矿床产出受韧-脆性变形构造控制。韧-脆性构造转换对矿床(体)形成和分布的控制作用,具有重要的理论和实际意义。研究表明,变形条件不同,剪切带岩石蚀变类型存在差异。韧性变形多形成绢英岩化、绿泥石化,而脆性变形则以钾长石(钠长石)化、石英-黄铁矿-多硫化物化和碳酸盐化为主。蚀变岩型和石英脉型金矿床的矿石组成、矿石结构构造等特征表明,两类型金矿床的形成都经历了韧-脆性变形的多期次转换。区域应力松弛引起剪切带由韧性变形向脆性变形的大规模转换,可能是形成胶东矿集区金巨量富集的主要因素。
The output of Jiaodong shear zone gold deposit is controlled by the ductile-brittle deformation structure. It is of great theoretical and practical significance to control the formation and distribution of deposits by ductile-brittle structural transformation. The results show that there are some differences in the type of rock alteration in shear zone with different deformation conditions. Most of the ductile deformations are sericite and chlorite, while the brittle deformations are dominated by potash feldspar (albite), quartz-pyrite-polysulphide and carbonate. The characteristics of the ore composition and ore structure of the altered rock type and quartz vein type gold deposits show that the formation of the two types of gold deposits has undergone multi-stage conversion of ductile-brittle deformation. The regional stress relaxation leads to the large-scale transition of ductile deformation from ductile deformation to brittle deformation, which may be the main factor for the formation of large gold enrichment in the Jiaodong ore district.