坦桑尼亚穆索马—马拉绿岩带塔拉尼金矿床地质特征及找矿潜力分析

坦桑尼亚塔拉尼（Tarani）金矿床位于穆索马-马拉绿岩带内，矿体受近EW和NW向韧性剪切带控制。围岩为尼安萨超群绿泥千枚岩。矿石类型主要为石英脉型，矿石构造以细脉状、块状和蜂窝状为主，有用矿石矿物为自然金。矿化蚀变的主要类型有：硅化、硫化、绢云母化等。成矿阶段分为早期（S1）、中期（S2）和晚期（S3）3个阶段。矿床类型为剪切带石英脉型金矿床。金矿严格受地层和构造控制，尼安萨超群铁镁质火山-沉积建造是含矿地层，近EW和NW向韧性剪切构造带为赋矿构造。矿区内近EW和NW向韧性剪切带中变形强烈地段为矿区找矿有利地段。激电中梯和测深资料显示，在M1金矿脉两侧延伸方向和深部具有巨大的找矿潜力。

Geological characteristics and prospecting potential of Tarani Au deposit in Musoma-Mara greenstone belt, Tanzania

The Tarani Au deposit is located in the Musoma-Mara greenstone belt. Ore bodies are controlled by nearly EW and NW ductile shear zones and hosted by chlorite phyllis of Nyanzian Super-group. The ore is dominated by the quartz vein type and mainly in veinlet, massive and honeycomb structures. Natural gold is the main ore mineral. Alteration includes silicification, sulfidation, sericitization, etc. The mineralization is divided into three stages:the early (S1) stage, the middle (S2) stage and late (S3) stage. It is a shear zone-hosted quartz vein type Au deposit. The femic volcanic sedimentary formation of Nyanzian super-group is the ore-bearing stratum. The strongly deformed areas near EW and NW ductile shear zones are the favorable place for further prospecting. IP intermediate gradient and sounding data show that the most favorable prospecting targets should be located at both extension directions and to depth of Au ore vein M1.