湖南渣滓溪锑钨矿床构造控矿特征及动力机制  

Structural control characteristics and dynamic mechanisms of Zhazixi Sb-W deposit in Hunan

作　　者：柏道远 李彬 吴梦君 王朝飞 BAI Daoyuan;LI Bin;WU Mengjun;WANG Zhaofei(Geological Survey Institute of Hunan Province,Changsha 410016,China;Hunan Anhua Zhazixi Mining Co.,Ltd.,Anhua 413507,China)

机构地区：[1]湖南省地质调查所,长沙410016 [2]湖南安化渣滓溪矿业有限公司,湖南安化413507

出　　处：《桂林理工大学学报》2024年第4期567-575,共9页Journal of Guilin University of Technology

基　　金：自然资源部新一轮找矿突破战略行动科技支撑项目(ZKKJ202408);中国地质调查局综合研究项目(DD20230025)。

摘　　要：目前关于雪峰弧形构造带的矿床空间定位、钨矿床与锑矿床共生、矿脉产状变化、局部矿化富集、矿体定向侧伏等成矿特征与构造的关系尚缺乏研究。渣滓溪矿床是位于雪峰弧形构造带中段的一个锑、钨共生矿床,本文基于构造调查、区域构造和矿区构造的综合分析,对该矿床的构造控矿特征及动力机制进行了探讨,主要认识如下:(1)NWW向渣滓溪断裂及断裂北盘次级走滑断裂和顺层剪切断裂的发育是渣滓溪锑钨矿床形成的关键,这些断裂的定位与渣滓溪一带在志留纪晚期和中三叠世晚期构造事件中应力集中有关。(2)渣滓溪断裂和锑矿脉的波状弯曲及产状变化部位富矿体的发育,主要与断裂分段性及桥构造有关;矿区南部Ⅰ脉组锑矿脉走向NWW、倾向NNE且产状较缓,与含矿断裂形成于中三叠世晚期NW向挤压有关;而矿区北部Ⅲ脉组锑矿脉走向NNW且产状直立,与含矿断裂形成于晚三叠世早期SN向挤压有关;靠近渣滓溪断裂时锑矿主矿脉更富集,与离配矿断裂更近、挤压更强、容矿断裂规模更大有关。(3)渣滓溪断裂北盘的富矿体向SE高角度侧伏,可能与含矿断裂运动方向往NW低角度倾斜有关,而含矿断裂运动方向倾斜与盖层往NW滑移导致区域最大主压应力往NW倾斜有关。渣滓溪断裂中矿体向SEE侧伏,与先期NE向逆断裂限制下NWW向走滑断裂的变形强度存在横向差异有关。Zhazixi deposit is an Sb-W coexisting deposit located in the middle section of Xuefeng arc-shaped structural belt.At present,there is a lack of research on the relationships between structures and metallogenic characteristics such as the spatial positioning of deposit,coexistence of Sb and W deposits,changes of the attitude of ore veins,local mineralization enrichment,directional lateral trending of ore bodies.In view of this,based on structural investigation and comprehensive analysis of regional and mining structures,this research explores the structural control characteristics and dynamic mechanisms of Zhazixi Sb-W deposit.(1)The development of NWW-trending Zhazixi fault and the secondary strike-slip faults and bedding-parallel faults on northern side of the fault is the key to the formation of Zhazixi Sb-W deposit,and the positioning of these faults is related to the stress concentration in tectonic events of the late Silurian and late Middle Triassic in Zhazixi area.(2)The wavy curva-ture of Zhazixi fault and Sb ore veins and the development of rich ore bodies at the location of attitude changes are mainly related to fault segmentation and bridge structures.The Sb veins in vein groupⅠin southern part of mining area have a NWW-trending strike,a NNE-trending inclination and a relatively gentle attitude,which is related to the formation of former ore-bearing faults in NW compression in the late Middle Triassic,and the Sb veins in vein group Ⅲ in northern part of mining area have a NNW-trending strike and are steep,and the ore-bearing faults are formed in SN compression early Middle Triassic.When approaching Zhazixi fault,the main Sb veins are more en-riched,which is related to being the closer to the ore-distributing fault,the stronger compression,and the larger scale of the ore-bearing faults.(3)The high-angle plunging to SE of rich ore bodies on northern side of Zhazixi fault may be related to the low-angle inclination to NW of the movement direction of ore-bearing faults,while the latter is related to th

关 键 词：渣滓溪锑钨矿床 矿床定位 矿脉产状 矿化富集 矿体侧伏 动力机制 湖南 

分 类 号：P611[天文地球—矿床学] P618.66[天文地球—地质学]