甘肃金川铜镍矿区F_1断层地质特征及其影响  

Geological Characteristics and Its Influence of F_1 Fault in Jinchuan Cu-Ni Mining Area in Gansu Province

作　　者：米文满 王俊超[1] 张永龙[1] 彭伦[1] 张元坤[1] 张琳琳[2] Mi Wenman;Wang Junchao;Zhang Yonglong;Peng Lun;Zhang Yuankun;Zhang Linlin(Longshou Mine,Jinchuan Group Co.. Ltd.;No. 2 Mine,Jinchuan Group Co. ,Ltd.)

机构地区：[1]金川集团股份有限公司龙首矿 [2]金川集团股份有限公司二矿

出　　处：《现代矿业》2018年第3期107-110,114,共5页Modern Mining

摘　　要：甘肃金川铜镍矿区最主要的控矿因素为构造,特别是断裂,不仅控制了成矿作用,为矿体形成提供场所,而且对已形成的岩体、矿体进行改造。矿区北部的F_1断层为一级断裂,通过龙首矿西一充填系统1 460 m水平钻孔工程首次对F_1断层进行了深部坑道工程验证,对该断层产状、规模及空间形态提出了新的认识。研究表明:(1)F_1断层沿走向长200 km,走向NW,倾向SW,倾角60°~70°,断层上盘前震旦系逆冲于第四系之上,属于矿区的一级结构面,控制着区域地层稳定性及山体稳定性;(2)F_1断层并非一个简单的线状构造,而是在长期的构造演化中由若干断裂连接复合组成的断裂系,具有长期而强烈的破坏作用;(3)F_1断层上盘岩性为前震旦系白家咀子组,由暗绿色夹肉红色混合花岗片麻岩组成,F_1断层下盘岩性为第三系及第四系砂砾岩、泥岩、亚黏土;(4)第三纪及第四纪以来,F_1断层处于活动状态,目前该断层的活动是以沿断裂面水平扭动为主;(5)F_1断层为导水断层,含水层性质为裂隙水,地表雨水或第四系砂砾岩渗滤水通过构造断裂带及不规则裂隙呈现大量涌水现象,易引发工程事故。Structure is the main ore-controlling factors of Jinchuan Cu-Ni mining area in Gansu Province. In particular,the faults not only control the mineralization,provide metallogeinic places for the formation of ore-bodies,but also transform the already formed rock mass and ore-bodies. F_1 fault is the level one fracture in the north of Jinchuan Cu-Ni mining area,deep tunnel engineering verification of F_1 fault is done by 1 460 m level drilling engineering of the west one filling system of Longshou Mine,some new understanding of the occurrence,scale and spatial morphology of the fault are obtained based on analyzing the engineering verification data. The study results show that：（1）the length of F_1 fault along its striking direction is 200 km,its striking direction is NW,its trending direction is SW,its angle is 60° ~ 70°,Sinian in the upper part of F_1 fault thrust against the Quaternary,which is belongs to the grade one structural plane,and controls regional strata stability and mountain stability;（2）F_1 fault is not a simple linear structure,in fact,it is belongs to the fracture system composed of the connection of several fractures,and its destructive degree is strong and its destructive effects last for long time;（3）lithology of the upper of F_1 fault is Baijiajuzi Formation of Former Sinian,it is composed of mixed granite gneiss with dark green contains meat red color,lithology of the lower of F_1 fault is Tertiary and the glutenite,mudstone,mild clay of Quaternary;（4）since the period of Tertiary and Quaternary,F_1 fault is in the active state,at present,activi ty of the fault is mainly manifested as horizontal twist along the fracture surface;（5） F_1 fault is belongs to water transmitting fault,the aquifer property is fissure water,massive flooding phenomenon is existed by surface water or the leachate water of Quaternary glutenite through tectonic fault zone and irregular fissures,therefore,some corresponding engineering accidents will be happened.

关 键 词：铜镍矿区 断裂构造 F1断层 导水构造 控矿构造 

分 类 号：P618.41[天文地球—矿床学] P618.63[天文地球—地质学]