甘肃早子沟金矿复合成矿构造系统的构成、样式、演化和控矿规律  

Composition,Pattern,and Evolution of Compound Metallogenic Structural System and Their Controls on Mineralization of Zaozigou Gold Deposit,Gansu Province

作　　者：钱建平[1] 张果 漆炜博 王珂 符有江 周永宁 常德才[1] 张猛 苏特 宋慷慷 QIAN Jianping;ZHANG Guo;QI Weibo;WANG Ke;FU Youjiang;ZHOU Yongning;CHANG Decai;ZHANG Meng;SU Te;SONG Kangkang(College of Geosciences,Guilin University of Technology,Guilin 541004,Guangxi,China)

机构地区：[1]桂林理工大学地球科学学院,广西桂林541004

出　　处：《大地构造与成矿学》2020年第5期913-936,共24页Geotectonica et Metallogenia

基　　金：国家自然科学基金项目(41263003);中国科学院地球化学研究所矿床地球化学国家重点实验室开放基金项目(201308);招金矿业股份有限公司所属甘肃合作早子沟矿业有限公司项目(2015-2017);广西隐伏金属矿产勘查重点实验室项目联合资助。

摘　　要：通过区域成矿构造背景分析、矿区构造-脉岩-矿化蚀变带填图、构造专题研究和勘探资料整理和编图,厘定了矿区成矿构造系统,阐明了矿区成矿构造系统的构成、样式和空间分布,提出了矿区西部SN向“八”字型逆冲断裂子系统,矿区中东部NE向“多”字型横张断裂子系统和NW-NWW向“X”型逆掩断裂子系统组成的复合成矿构造系统。根据矿区板理、压性断裂、岩脉和矿脉构造产状、特征和组合型式进行动力学分析。突出主构造方位和性质的演替,综合分析中三叠世以来矿区构造、岩浆、热液成矿作用等地质事件的相互关系,重建矿区构造-成岩-成矿演化序列。系统地总结了矿区构造控矿规律,即:复合成矿构造系统控矿,控岩构造与控矿构造具有一致性和构造界面控矿,NE向控矿断裂具有明显的走向优势性,NE向矿体明显向南西侧伏和74~81线为矿区的矿化中心,缓倾斜矿体在剖面具多层次性,多阶段构造-热液成矿叠加形成矿化富集。结合上述成矿构造研究和构造地球化学测量成果,提出了矿区深部74~81线NE向构造与NW-NWW向构造交汇部位附近,以及地表NE向主矿带两侧和近SN向矿带北端为下一步找矿预测区。The metallogenic structure system is constructed based on analysis of the regional tectonic background,mapping of tectonic-vein-ore-related alteration zone,thematics of tectonics,and exploration data.This paper summarized the composition,pattern,spatial distribution of the metallogenic tectonic system.The system is further divided into three subsystems,which including the NS trending‘八’type thrust fault system in the west part of the mining area,the NE trending‘多’type transverse fracture subsystem,and the NW-NWW trending‘X’-type overthrust fracture subsystem in the middle and eastern parts of the mining area.The dynamic analysis was carried out on the foliation,compressive faults,tectonic occurrence of dykes and veins,characteristics and combinations.This paper comprehensively analyzed the interrelationship of geological events such as tectonics,magmtism and hydrothermal mineralization in the mining area since the Triassic,and emphasized the succession of main structural orientation and properties,and reconstructed the tectonic-diagenetic-metallogenic evolutionary sequence of the mining area.The paper systematically summarized the ore-controls of the structure in the mining area,which include the compound metallogenic structural system controls of the ore deposits,the consistency between rock-controlling structure and ore-controlling structure and ore-controlling interface.It can be inferred that the NE-trending faults are predominant ore-controlling factor,the NE-trending orebody is south-west dipping,and line 7481-is the mineralization center of the mining area,whereas the gently inclined orebodies are characterized by multi-layers and multi-stage tectonic-hydrothermal superimposition.Combined with the results of structural geochemical survey,our results of metallogenic structure research suggest that future prospecting prediction should focus on the junction of NE-trending structure and NW-NWW-trending structure along line 74-81 in the deep part of the mining area,on both sides of the NE-trendi

关 键 词：金 锑 成矿构造系统 构造样式 构造演化 构造控矿规律 早子沟 甘肃 

分 类 号：P542[天文地球—构造地质学] P613[天文地球—地质学]