薛艳,韩天成,陶威,易志强,马洪勇,黄向东.商丹断裂带(河南段)构造变形特征及其找矿意义[J].地质找矿论丛,2021,36(3):257-264
商丹断裂带(河南段)构造变形特征及其找矿意义
Structural deformation characteristics of the section in Henan province of Shangdan fault and the ore prospecting significance
投稿时间:2021-03-17  
DOI:10.6053/j.issn.1001-1412.2021.03.002
中文关键词:  商丹断裂带(河南段)  韧-脆性断裂带  金矿  显微构造解析  构造控矿  豫西地区
英文关键词:the section of Shangdan fault in Henan province  ductile-brittle fault zone  Au deposit  microscopic structural interpretation  structure control on ore  northwest Henan province
基金项目:河南省地矿局局管地质科研项目(豫地矿科研[2017]12号)资助。
作者单位E-mail
薛艳 河南省地质矿产勘查开发局第一地质勘查院, 郑州 450001  
韩天成 河南省地质矿产勘查开发局第一地质勘查院, 郑州 450001  
陶威 大陆动力学国家重点实验室, 西北大学地质学系, 西安 710069
陕西省矿产地质调查中心, 西安 710068 
hputw07@163.com 
易志强 河南省地质矿产勘查开发局第一地质勘查院, 郑州 450001  
马洪勇 河南省地质矿产勘查开发局第一地质勘查院, 郑州 450001  
黄向东 河南省地质矿产勘查开发局第一地质勘查院, 郑州 450001  
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中文摘要:
      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。分析方解石机械双晶、矿物动态重结晶及变质矿物组合等显微构造显示,断裂带以韧性变形为主,两侧地层以韧性和脆性变形叠加为特征。区内变质变形温度以绿片岩相、中低温为主,局部可达角闪岩相。早期的韧性剪切活动控制本区金矿的总体控矿界面,晚期的构造活动形成的韧-脆性破碎带对先期形成的矿床进行改造、富集、最终定位,主断裂两侧的次级韧-脆性构造带是未来寻找金矿的有利部位。
英文摘要:
      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.
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