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首页> 外文期刊>Economic geology and the bulletin of the Society of Economic Geologists >Silver Isotopes as a Source and Transport Tracer for Gold: A Reconnaissance Study at the Sheba and New Consort Gold Mines in the Barberton Greenstone Belt, Kaapvaal Craton, South Africa
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Silver Isotopes as a Source and Transport Tracer for Gold: A Reconnaissance Study at the Sheba and New Consort Gold Mines in the Barberton Greenstone Belt, Kaapvaal Craton, South Africa

机译：银同位素作为黄金的源头和运输示踪剂：在南非Kaapvaal Craton，Kaapvaal Craton，Kaapvaal Craton，Kaapvaal Craton，Kaapvaal Craton，南非的侦察研究

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摘要

Silver isotopes are a potential tracer for understanding the geochemical enrichment of gold, which is monoisotopic but occurs in metallic form with silver as a stable alloy component. This study applies high-precision measurements of silver isotope ratios to two of the oldest world-class hydrothermal gold vein deposits from the Archean (3.55-3.10 Ga) Barberton greenstone belt of the Kaapvaal craton in South Africa. Published structural-geologic and geochronological results show that the hydrothermal gold deposits formed late in the tectono-metamorphic history of the greenstone belt, well after major crustal deformation and regional metamorphism, probably postdating even postorogenic granitic intrusions. Cold is concentrated in extensional brittle-ductile structures, indicating a common extensional stress field during mineralization. Orebodies occur close to the stratigraphic contact between older (ultra-)mafic submarine lavas (the Onverwacht Group) and overlying carbonaceous siltstones and graywackes (the Fig Tree Group), marked by a variably tectonized former chert. Observations at New Consort (higher temperature, close to granitoid contact), Fairview, and Sheba (lower temperature in the interior of the greenstone belt) confirm the structurally late introduction of gold into veins and sulfide replacement orebodies.
机译：银同位素是一种潜在的示踪剂，用于了解金种富集金，这是单同步缺乏的，但以金属形式与银作为稳定的合金组分。本研究适用于来自南非Kaapvaal Craton的Archean（3.55-3.10 GA）南非的Archean（3.55-3.10 GA）Barberton Greenstone腰带的高精度测量。已发表的结构性地质和地理论图结果表明，在绿石传动系统的构成 - 变质历史上形成了水热金矿床，经过重大的地壳变形和区域变质，可能会消耗甚至发起后造粒侵入性。冷浓缩在膨胀脆性 - 延展结构中，指示矿化过程中的常见延伸应力场。 Orebodies发生靠近较旧的（超级）米什山楂熔岩（OnverWacht组）和覆盖的碳质硅灰石和磨碎（无花果树组）之间的地层接触，由可变构造的前燧石标记。在新的联盟（温度较高，接近花岗位接触），Fairview和Sheba（绿石带内部的温度较高）的观察结果证实了金色的结构晚期引入静脉和硫化物替代矿体。

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