内蒙古额济纳旗老硐沟金多金属矿区成矿构造系统解析和构造控矿规律  

Analysis of the Metallogenic Structure System and the Regularities of Tectonic Ore Control of the Laodonggou Gold Polymetallic Mining Area, Ejinaqi, Inner Mongolia

作　　者：钱建平[1] 符有江 周永宁 李佳奇[1] 常德才[1] 李风豪 韦振兆 苏特 QIAN Jianping;FU Youjiang;ZHOU Yongning;LI Jiaqi;CHANG Decai;LI Fenghao;WEI Zhenzhao;SU Te(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》2018年第6期1046-1063,共18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(201308);招金矿业股份有限公司所属额济纳旗圆通矿业有限公司项目(2015-2017);广西隐伏金属矿产勘查重点实验室联合资助

摘　　要：通过区域成矿构造背景分析、矿区构造地质调查、构造地球化学测量、勘探资料系统整理编图和三维地质建模,厘定了老硐沟金多金属矿区成矿构造系统,并将其解析为加里东期近东西向成矿构造子系统、海西期-印支期北西西与次级北北西向"入"字型成矿构造子系统、喜山期溶洞成矿构造子系统,阐述了复合成矿构造系统的基本要素、特征和控矿作用,重建了成矿构造系统的演化过程,系统地总结了矿区构造控矿规律。通过研究认为不同成矿构造子系统控制不同的矿床类型:近东西向成矿构造子系统控制了石英脉型钨矿体和矽卡岩型铜多金属矿体的产出;北西西与次级北北西向"入"字型成矿构造子系统控制了蚀变岩型金多金属矿体的产出;溶洞成矿构造子系统控制了溶塌堆积型金矿体的产出。不同矿段的蚀变岩型金矿脉构式不同:由西向东,由Ⅱ矿段→Ⅴ矿段→Ⅰ矿段,依次呈现出"入"字型、"多"字型和"亖"字型,在动力学机制上都统一于成矿期东西向右旋力偶剪切构造应力场。控制脉岩的构造、控矿构造和控洞构造具有一致性和继承性,蚀变岩型的金矿脉具有:北西西和北北西走向优选性,矿体倾向随岩脉倾向变化而变化,矿体具有向北西侧伏的规律。含矿岩系的层序构造亦是有利的控矿因素。根据这些控矿规律可以有效地进行矿区找矿预测。The metallogenic structure system of the Laodonggou gold polymetallic mining area is constructed on the basis of analysis of regional tectonic background, tectonic geological and tectonic geochemical survey, compilation of previous exploration data, as well as 3D geological modeling. It is further divided into three subsystems, which including the Caledonian E-W metallogenic tectonics, the Hercynian-Indosinian "入" type structure that constitutes the major NWW and secondary NNW metallogenic tectonics, and the Himalayan karst cave metallogenic structure. This paper summarized the basic elements, major features and and ore-controlling role of the complex metallogenic tectonic system, and discussed the evolution of the metallogenic tectonic system. Different metallogenic tectonic subsystem controls different mineralization types: the quartz vein type tungsten ores and skarn type copper polymetallic ores are controlled by the E-W metallogenic tectonic subsystem, the altered rock type gold polymetallic ores are controlled by the "入" type structure, whereas the karst cave metallogenic structure controlled the karst type gold ores. The structural styles of altered rock type gold ore bodies vary in different ore sections, from West to East, from Ⅱ, Ⅴ to Ⅰ ore section, showed in order "入" type, "多" type and "亖" type, which are in consistent with the progressing of a E-W right-lateral shear stress field in mineralization period. The vein rock, ore and karst cave control structure are consistent and inheriting. The orientated direction of altered rock type gold ore bodies are mostly NWW and NNW. Occurrences of the ore bodies are closely related to those of the dikes and generally NW lateral trending. The sequence structure of the host rocks is also favorable for ore mineralization. According to these ore-controlling regularity, the prospecting and prediction in this mining area can be carried out effectively.

关 键 词：金矿 成矿构造系统 构造解析 构造演化 构造控矿规律 老硐沟 内蒙古 

分 类 号：P542[天文地球—构造地质学]