商丹断裂带(河南段)构造变形特征及其找矿意义

商丹断裂带是一条多期次活动的大型断裂带,区域上也是大型金属矿的赋存带,对金属矿产具有重要的控制作用.文章以商丹断裂带(河南段)为研究对象,在基于孔沟至寨根一带构造剖面的宏观特征和显微构造特征解析的基础上,对研究区控矿构造和机理提出了新的认识.综合研究表明,商丹断裂带(河南段)具多期活动特征,整体呈现"正花状构造"样式....

Structural deformation characteristics of the section in Henan province of Shangdan fault and the ore prospecting significance

Shangdan fault is a large scale fault belt with multiperiodic activities. Regionally large scale metal deposits occur in the belt thus it is a major ore control structure. This paper deals with its section in Henan province. Based on the interpretation of macro and micro structure along Konggou-Zhaigen structural profile a new understanding of the ore-control structure and the mechanism is put forward. The section of the fault in Henan province is characterized by multiple periodic activities and positive flower style structure on the whole. Analysis of microscopic structural phenomenon, such as the mechanical twin crystal of calcite, dynamic recrystallization of minerals and metamorphic mineral assemblages show that the fault belt is characterized by dominance of ductile deformation and overprint of ductile deformation and brittle deformation of the strata on both sides of the fault. Dominance of green schist facies reflects medium-low metamorphic tempreture. At only locality is reached amphiblite fancies. The early ductile activity controls the overall ore-control interface of the Au deposit in the area. The late ductile-brittle fractural zone reworked the early formed deposit making enrichment then localized the ore deposits. The sub-ductile-brittle zones on both sides of the main fault are the prospecting targets in the future.