Provenance and genesis of the auriferous palaeoplacer deposits in the Palaeoproterozoic Moeda Formation, Minas Gerais, Brazil
巴西米纳斯吉拉斯州古元古代 Moeda 组含金古砂矿床的物源和成因
基本信息
- 批准号:223867934
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2012
- 资助国家:德国
- 起止时间:2011-12-31 至 2015-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The Palaeoproterozoic Moeda Formation of the Quadrilátero Ferrífero in Minas Gerais (Brazil) consists of several conglomerate/quartzite units with economic gold grades in some conglomerate beds. These deposits bear strong similarities to palaeoplacer deposits elsewhere in the world where they are known for their enormous economic potential for both gold and uranium. The prime example is the famous Archaean Witwatersrand Basin in South Africa, which hosts about 40% of all known minable gold in the world. The success of any future exploration is invariably dependent on a sound genetic model. The goal of this project is, therefore, to reconstruct the genesis of the gold deposits in the Moeda Formation using modern analytical techniques and applying existing experience with the Witwatersrand deposits. The principal questions to be addressed are whether the gold came into the host conglomerate originally as detrital particles ¿ analogous to the Witwatersrand deposits ¿ and, if that was the case, where the source(s) of that detrital gold was (were) located, and moreover to which extent gold was (re-)mobilised by post-depositional metamorphic/hydrothermal fluids. To this effect geological fieldwork, petrological and lithogeochemical analyses, multiple sulphur isotope studies and trace element analyses of gold, selected sulphides and silicates are planned. This will be complemented by a comparative study on the gold deposits in the adjacent Rio das Velhas Greenstone Belt because they appear to be the closest equivalents to likely source(s) of the detrital sulphide and gold particles in the Moeda Formation conglomerates. Overall the expected results will help considerably in improving our understanding of this economically most important type of conglomerate-hosted gold (and uranium) deposits worldwide.
米纳斯吉拉斯(巴西)古元古代QuadrilájumFerrífero的Moeda组由几个砾岩/石英岩单元组成,其中一些砾岩层具有经济金品位。这些矿床与世界其他地方的古砂矿矿床有很大的相似之处,这些矿床以其巨大的黄金和铀经济潜力而闻名。最好的例子是南非著名的威特沃特斯兰德盆地,那里拥有世界上所有已知可开采黄金的40%。未来任何探索的成功都取决于一个健全的遗传模型。因此,该项目的目标是利用现代分析技术和威特沃特斯兰德矿床的现有经验,重建Moeda组金矿的成因。要解决的主要问题是,金是否最初是作为类似于威特沃特斯兰德矿床的碎屑颗粒进入主砾岩的,如果是这样的话,碎屑金的来源位于何处,以及金在多大程度上被沉积后变质/热液流体(重新)动员。为此,计划进行地质实地考察、岩石学和岩石地球化学分析、多种硫同位素研究以及对金、某些硫化物和硅酸盐的微量元素分析。将对邻近Rio das Velhas绿岩带的金矿进行比较研究,因为它们似乎与Moeda组砾岩中碎屑硫化物和金颗粒的可能来源最接近。总的来说,预期的结果将大大有助于提高我们对这种经济上最重要的全球砾岩型金(和铀)矿床的理解。
项目成果
期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
First whiffs of atmospheric oxygen triggered onset of crustal gold cycle
大气中的第一缕氧气引发了地壳黄金循环的开始
- DOI:10.1007/s00126-014-0574-8
- 发表时间:2015
- 期刊:
- 影响因子:4.8
- 作者:Frimmel;Hennigh
- 通讯作者:Hennigh
Depositional age and sediment source of the auriferous Moeda Formation, Quadrilátero Ferrífero of Minas Gerais, Brazil: New constraints from U–Pb–Hf isotopes in zircon and xenotime
巴西米纳斯吉拉斯州 Quadrilátero Ferráfero 含金 Moeda 地层的沉积年龄和沉积物来源:锆石和磷钇矿中 UâPbâHf 同位素的新限制
- DOI:10.1016/j.precamres.2014.09.010
- 发表时间:2014
- 期刊:
- 影响因子:3.8
- 作者:Koglin;Cabral;Seabra Gomes Jr;Corrêa Neto;Brunetto;Galbiatti
- 通讯作者:Galbiatti
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Dr. Nikola Koglin其他文献
Dr. Nikola Koglin的其他文献
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