坦桑尼亚马拉-穆索马绿岩带金矿地质特征及成矿规律浅析  

Geological Characteristics and Metallogenic Rules of Gold deposits in the Mara-Musoma Greenstone Belt of Tanzania

作　　者：王建光[1] 彭俊[1] 袁扬森 司建涛[1] 梁永安[1] 杨洋[1] 

机构地区：[1]河南省地质矿产勘查开发局第二地质矿产调查院,河南郑州450001

出　　处：《地质与勘探》2017年第2期406-412,共7页Geology and Exploration

基　　金：国外矿产资源风险勘查专项资金项目(编号201210B01600234)资助

摘　　要：坦桑尼亚太古代马拉-穆索马绿岩带位于坦桑尼亚西北部、维多利亚湖东部地区,是坦桑尼亚重要的金矿聚集区。该地区主要金矿床类型为受陡倾或缓倾剪切构造带控制的构造蚀变岩型和石英脉型金矿床。本文通过对亚斯罗利、瑞万科玛和尼亚布隆渡等3个典型金矿床进行对比研究,系统分析了金矿床的成矿地质条件、矿化蚀变特征及矿石结构构造特征,总结了马拉-穆索马绿岩带金成矿规律,认为金矿床的形成与镁铁质火山-沉积岩、韧-脆性剪切构造带及岩浆活动有密切关系,近东西向韧-脆性剪切带是区内最主要的控矿构造,控制着主要工业矿体的分布。The Archaean Mara - Musoma greenstone belt in the eastern part of the Lake Victoria of NW Tanzania is an important gold ore concentra- tion area. The main deposit types include the tectonic alteration rock type and quartz vein type which are controlled by steeply or gently dipping shear zones. Comparison of three typical gold deposits such as the Nyasirori, Rwamkoma and Nyabarundu gold mines permits to reveal the metallogenic geolog- ical conditions, alteration and ore characteristics and gold metallogenic rules of gold deposits in this area. It is suggested that the gold mineralization is closely linked with mafic volcanic - sedimentary rocks, ductile - brittle shear zones and magmatic activities. The nearly E - W trending shear zones are the primary ore - controlling structures which control the distribution of main industrial ores.

关 键 词：坦桑尼亚 马拉-穆索马绿岩带 金矿地质特征 成矿规律 

分 类 号：P618[天文地球—矿床学]