摘要
小假足铁矿位于川滇南北构造体系南段与北西西构造带的交汇部位,区域断裂、褶皱、构造发育,具有良好的成矿地质条件。依托矿区以往地质资料,在充分分析成矿地质背景、矿区地质特征的基础上,着重讨论了矿床控矿因素及成因。研究表明:矿区断裂构造发育,黑山头组富良棚段与大龙口组接触的断层破碎带和断裂交汇部位是主要的赋矿部位,矿(化)体主要呈脉状、透镜状产出。矿床金属矿物主要以褐铁矿和磁铁矿为主,次为镜铁矿、软锰矿和黄铁矿等,脉石矿物主要为石英、重晶石,矿石结构以隐晶质或针状结构、片状结构、溶蚀结构为主。矿床严格受地层岩性和断裂构造控制,以构造控制作用最为显著,断裂为含矿热液提供了运移通道和容矿空间。矿床成因类型属于热液交代型,构造交汇部位及典型围岩蚀变可作为重要的找矿标志。
The Xiaojiazu iron mining area is located in the intersection part of southern-northern tectonic system and north-west structural belt in Sichuan-Yunnan region.The fold fault and structure is developed in the area,so it has favorite ore-forming geological conditions.The article puts great emphasis on discussing the ore-controlling factors and ore genesis,based on the previous geological data,metallogenic geological background and geological characteristics of mining area.This research showed that the mining area developed fault structure,the fault crushing belt between Fuliangpeng section of Heishantou Formation and Dalongkou Formation,and the fault intersection zone are mainly ore-bearing position.The orebodies(mineralization)are occurred as vein-like and lenticular output.The main ore minerals are including ironstone and magnetite.Besides,the ore minerals including ironcored mica,pyrolusite and pyrite.and gangue minerals are including quartz and barite,which developed as cryptocrystalline structure,needle-like morphology structure,laminar structure and resorption texture.The Xiaojiazu iron deposit are strictly controlled by stratum lithologic and fault structure,and the faults provide migration channel and host space for deposit.Generally,the faults in mining area have the most significant affection to Xiaojiazu iron deposit.The ore genesis of Xiaojiazu iron deposit is belongs to metamorphic-hydrothermal type,and the structure intersection and typical surrounding rock alteration can be regarded as important ore-prospecting marks.
作者
彭星宇
周宇
郑义舟
PENG Xingyu;ZHOU Yu;ZHENG Yizhou(Geological,Geophysical-Geochemical Exploration,Yunnan Bureau of Nonferrous Geology)
出处
《现代矿业》
2026年第2期177-180,共4页
Modern Mining
关键词
构造控矿
矿床成因
铁矿床
structural ore-control
deposit genesis
iron deposit
