Abstract

The Oleninskoe gold deposit is located in the northwestern part of the Kolmozero–Voron’ya greenstone belt (Kola Peninsula), in a sequence of amphibolite with granite porphyry sills. The sills are genetically connected with a big granodiorite- and granite-porhyry massif, which hosts the Pellapahk Cu–Mo porphyry deposit. The geochemical association of the Oleninskoe includes As, Pb, Ag, Cu, Sb, and Au; the Au/Ag ratio is less than 0.2. The ore is of very complex mineral composition (more than 50 mineral names of intermetallic compounds, sulfides, and sulfosalts are defined), with widespread Ag and Sb minerals. Fluid inclusions in quartz are of high salinity with anomalous concentration of minor elements. All these characteristics show that the deposit formed in an Early Precambrian porphyry-epithermal system. Then the deposit underwent metamorphism (lower amphibolite facies) in the Neoarchean and Paleoproterozoic, indicating the absence of chlorite and a scarcity of carbonates in metasomatic rocks, replacement of pyrite with pyrrhotite, and signatures of sulfide anatexis in ore. This is the first finding of this genetic type of gold deposits in the northern part of the Fennoscandian Shield.

中文翻译：

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Fennoscandian盾前寒武纪中变质的Au-Ag矿床：一种新的概念模型

摘要

Oleninskoe金矿床位于Kolmozero–Voron'ya绿岩带（可乐半岛）的西北部，成片闪石与花岗岩斑岩基岩。窗台与大型的花岗闪长岩和花岗石斑岩质地块有遗传联系，该地块蕴藏着Pellapahk Cu-Mo斑岩矿床。Oleninskoe的地球化学协会包括砷，铅，银，铜，锑和金；Au / Ag比小于0.2。矿石的矿物成分非常复杂（定义了50多种金属间化合物，硫化物和亚硫酸盐的矿物名称），且Ag和Sb矿物分布广泛。石英中的流体包裹体盐度高，微量元素含量异常。所有这些特征表明，该沉积物是在早前寒武纪斑岩-上热系统中形成的。然后该矿床在新古代和古元古代发生了变质作用（较低的闪石相），表明交代岩石中没有绿泥石和碳酸盐稀缺，黄铁矿置换了黄铁矿以及矿石中的硫化物无烟石特征。这是在芬诺斯堪的纳山脉北部的这种金矿的遗传类型的首次发现。