| 袁杨森,卢俞杰,彭俊,曹义甲,祁东,邢忠.坦桑尼亚布里扬胡鲁金矿床地质特征及成因探讨[J].矿产勘查,2023,14(1):153-162 |
| 坦桑尼亚布里扬胡鲁金矿床地质特征及成因探讨 |
| Geological characteristics and genesis of the Bulyanghulu gold deposit in Tanzania |
| 投稿时间：2022-01-07 |
| DOI：10.20008/j.kckc.202301018 |
| 中文关键词: 地质特征 矿床成因 成矿模式 金矿床 布里扬胡鲁 坦桑尼亚 |
| 英文关键词: geological features genesis of ore deposit metallogenic model gold deposit Bulyanghulu Tanzania |
| 基金项目:本文受河南省自然资源厅2022年度财政地质勘查项目(豫政采20220283-2)资助。 |
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| 中文摘要: |
| 布里扬胡鲁金矿床是坦桑尼亚最大的金矿床,位于坦桑尼亚维多利亚湖金矿田,赋存于太古宙苏库马兰德绿岩带变质火山岩中；火山岩类型为基性火山岩和长英质火山岩,为一套双峰火山岩,变质程度为绿片岩相。矿床类型为石英脉型金矿床,矿体是由一系列沿剪切构造带走向充填的陡倾变形剪切石英脉组成；主矿体为Ⅰ号矿脉,赋存在下盘镁铁质火山岩和上盘英安质流纹岩接触部位的剪切构造带内。通过对矿床主成矿阶段矿石δ34S值为1.1‰～7.0‰,表明矿石中硫主要来源于地幔成因的基性火山岩；δD值范围在-49‰～-79‰,δ18O水值为7.2‰～8.6‰,显示成矿流体来源主要为岩浆水,并伴有变质热液的混入。在上述研究的基础上探讨了矿床的成矿模式,认为多期花岗岩体侵入活动形成的北北西向剪切构造带是本区的主要控矿构造,长英质斑岩体的侵入活动为含金石英脉的形成提供了成矿物质和能量。 |
| 英文摘要: |
| Bulyanghulu is the largest gold deposit of Tanzania,situated in the Lake Victoria Gold fields of Tanzania,within the Sukumaland Greenstone Belt of Archaen age. The types of volcanic rock mainly consist of basic volcanic rocks and felsic volcanic rocks,belonging to a suit of the bimodal volcanic rock, and the metamorphic degree is greenschist facies. The deposit type is quartz vein type and orebody is made up of a series of steeply plunging shear veins that vary in morphology along strike; The main orebody is Reef I which is hosted within the shear zone, where is the contact zone between a mafic volcanic footwall and rhyodacitic hangingwall. Based on the analysis of sulfur,hydrogen and oxygen isotopes in ores formed in the main metallogenic stage of the deposit,δ34S value is between 1.1‰ and 7.0‰,indicating that the sulfur comes from the basic volcanic of the mantle; δD value is -49‰ and -79‰,δ18Owater value is 7.2‰ and 8.6‰, suggesting that the source of the ore-forming fluid came from magmatic water mixed with metamorphic water.Based on aboved studys, mineralization model of the Bulyanghulu gold deposit is discussed. It is believed that the NNW shear zone formed by multi-stage granite intrusion are the main ore-controlling structures in this area, and magmatic activities of felsic porphyrys produce ore-forming material and energy. |
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