坦桑尼亚PL10451矿区绿岩带型金矿床地质特征及找矿标志
Geological characteristics and prospecting signs of greenstone belt type gold deposit of PL10451 area mining in Tanzania
耿同升 1路小丽 2罗清威 1权成 1秦德雨 1袁要伟1
作者信息
- 1. 河南省有色金属地质矿产局第七地质大队,河南 郑州 450016;河南省第七地质大队有限公司,河南 郑州 450016
- 2. 河南省地质矿产勘查开发局第五地质勘查院,河南 郑州 450001
- 折叠
摘要
PL10451矿区位于坦桑尼亚环维多利亚湖南部的恩泽加绿岩带上,该绿岩带具有优越的金成矿地质条件和巨大的金成矿潜力,目前已发现有众多特大型、大型金矿床.该地区的绿岩带型金矿床类型主要包括构造蚀变岩型、石英脉型及BIF型金矿床,其成矿受构造、岩浆岩与地层等条件严格控制.本文以恩泽加绿岩带西北部的PL10451矿区为研究区,通过详细的野外地质调查和工程验证,认为矿区金矿(化)体为受剪切带控制的构造蚀变岩型金矿,矿石结构以粒状变晶结构、交代结构和碎裂结构等为主;矿石构造以稀疏浸染状构造、细脉状构造及星点状构造等为主.矿(化)体围岩蚀变特征明显,黄铁矿化、硅化、绿泥石化与该区金成矿关系密切,并具有"低阻-高极化"的地球物理特征和"Au-As明显富集"的地球化学特征.
Abstract
The PL10451 mining area is located on the Nzega greenstone belt in the southern part of Lake Victoria,Tanzania.The greenstone belt has excellent gold metallogenic geological conditions and huge gold metal-logenic potential.At present,many large and medium-sized gold deposits have been discovered.The main types of gold deposits in this area include structural altered rock type gold deposits,quartz vein type gold deposits and BIF type gold deposits.Its mineralization is strictly controlled by structural,magmatic rock and stratigraphic condi-tions.In this paper,the PL10451 mining area in the northwest of the Nzega greenstone belt is taken as the research area.Through detailed field geological investigation and engineering verification,it is considered that the gold ore(mineralization)body in the mining area is a tectonic altered rock type gold deposit controlled by the shear zone.The ore textures are mainly composed of granular crystalloblastic texture,replacement texture and cataclastic texture,and the ore structures are mainly sparse disseminated structure,veinlet structure and starlike structure.The wall rock alteration of ore body is obvious.The pyrite mineralization,silicification and chloritization are closely related to gold mineralization in this area,and which has the geophysical characteristics of"low resistivity-high polarization"and the geochemical characteristics of"obvious enrichment of Au-As".
关键词
恩泽加绿岩带/地质特征/找矿标志/坦桑尼亚Key words
Nzega greenstone belt/geological characteristics/prospecting signs/Tanzania引用本文复制引用
基金项目
河南省国土资源厅2017年省财政地质勘查基金项目(201710)
出版年
2024
NETL
NSTL
维普
万方数据