| 李俊生,白德胜,卫建征,王滑冰,白文杰.坦桑尼亚马拉绿岩带金矿床地质特征[J].矿产勘查,2018,9(5):977-984 |
| 坦桑尼亚马拉绿岩带金矿床地质特征 |
| Characteristics of gold deposits in Mara greenstone belt,Tanzania |
| 投稿时间：2017-11-13 |
| DOI： |
| 中文关键词: 坦桑尼亚 马拉绿岩带 金矿床 地质特征 |
| 英文关键词: Tanzania, Mara greenstone, gold deposits, geological characteristics |
| 基金项目:国土资源部国外矿产资源风险勘查专项(编号:201210B01600234)资助。 |
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| 中文摘要: |
| 马拉绿岩带是坦桑尼亚太古宇绿岩带金成矿带的重要组成部分,研究区域金矿床类型、分布及矿床特征,总结成矿控矿规律对找矿工作具有重要意义。该区域金矿床类型分为构造蚀变岩型、含金石英脉型、层控型金矿床以及早期人工采矿形成的尾矿。构造蚀变岩型、含金石英脉型金矿床集中分布于绿岩带中的北西向、北东向断裂构造(韧性剪切带)及其交汇处,层控型金矿床主要赋存于中基性火山沉积岩、条带状铁建造中。矿体呈脉状、透镜状,品位、厚度变化较大,矿体规模大小不一。金矿石类型主要是蚀变岩型、石英脉型。尼安萨群的基性火山岩、BIF为金的“初始矿源层”,岩石经历了韧性—脆性变形,在岩浆侵入活动中,Au等成矿元素活化、迁移,并在上述构造有利部位富集成矿。 |
| 英文摘要: |
| Mara greenstone belt is an important part of the Archaeozoic greenstone zone of gold mineralization in Tanzania. It is important to study the gold deposit types, distribution and deposits’ characteristics and summarize regulations ore-forming and ore-controlling in this region for exploration of gold deposits. The types of gold deposit are divided into tectonic rock Au deposit, gold-bearing quartz vein deposit, stratabound Au deposit and the tailings of early artificial mining. The distribution of gold deposits which belongs to fractured alteration rock type or gold-bearing quartz vein type are concentrated in NW and NE shear zones and these zone’s intersection part in the greenstone belts, and the stratabound gold deposit is mainly situated in the intermediate-basic volcanic sedimentary rocks and the banded iron construction. The ore body is veined and lenticular. The grade, the thickness and the size are varies. The gold ore types are mainly altered rock type and quartz vein type. The basic volcanic rock and BIF experience ductile - brittle deformation in Nyanza group which are the source bed. In the activity of magma intrusion, the Au and other mineralization elements activated and transferred to a favorable tectonic position to be mineralized. |
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