The Mustajärvi gold occurrence lies in the southern part of the Paleoproterozoic Central Lapland Greenstone Belt, in proximity to the first-order transcrustal Venejoki thrust fault system. The gold occurrence is structurally controlled by the second-order Mustajärvi shear zone, which is located at the contact between siliciclastic metasedimentary and mafic to ultramafic metavolcanic rocks. The main mineralization comprises a set of parallel veins and sulfidized rocks that are slightly oblique to the shear zone and are hosted by third-order structures likely representing Riedel R-type shears. The gold-mineralized rock at Mustajärvi is associated with pyrite that is present in 0.15- to 1-m-wide quartz-pyrite-tourmaline veins and in zones of massive pyrite in the host rocks with thicknesses ranging from 1.15 to 2 m. In unweathered rock, hypogene gold is hosted by Au- and Au-Bi-telluride micro-inclusions in pyrite, whereas strong weathering at near surface levels has caused a remobilization of gold, resulting in free gold deposited mainly in the cracks of oxidized pyrite. The geochemistry of both mineralization styles is typical of orogenic gold systems with strong enrichments comprising Au, B, Bi, CO2, Te, and Se; and less consistent anomalous amounts of Ag, As, Sb, and W. Unusual for orogenic gold deposits is the strong enrichment of Ni and Co, which leads to the classification of Mustajärvi as orogenic gold occurrence with atypical metal association.

中文翻译：

---

Mustajärvi 造山带金矿，芬兰中部拉普兰绿岩带：以碲化物为主的矿物系统

Mustajärvi 金矿位于古元古代中央拉普兰绿岩带的南部，靠近一级跨地壳 Venejoki 逆冲断层系统。金矿床在结构上受二阶 Mustajärvi 剪切带控制，该剪切带位于硅质碎屑变沉积岩与镁铁质至超镁铁质变质火山岩之间的接触处。主要矿化包括一组平行的矿脉和硫化岩，这些岩脉与剪切带略微倾斜，并由可能代表 Riedel R 型剪切带的三级结构组成。Mustajärvi 的金矿化岩与黄铁矿相关，黄铁矿存在于 0.15 至 1 米宽的石英-黄铁矿-碧玺矿脉中，以及存在于厚度为 1.15 至 2 米的主岩中的块状黄铁矿带中。在未风化的岩石中，Hypogene 金由黄铁矿中的 Au-和 Au-Bi-碲化物微包裹体承载，而近地表水平的强烈风化导致金的再迁移，导致游离金主要沉积在氧化黄铁矿的裂缝中。两种成矿方式的地球化学特征是典型的造山带金系统，具有很强的富集，包括 Au、B、Bi、CO2、Te 和 Se；和不太一致的异常数量的 Ag、As、Sb 和 W。造山金矿床的异常是 Ni 和 Co 的强烈富集，这导致将 Mustajärvi 归类为具有非典型金属组合的造山金矿床。两种成矿方式的地球化学特征是典型的造山带金系统，具有很强的富集，包括 Au、B、Bi、CO2、Te 和 Se；和不太一致的异常数量的 Ag、As、Sb 和 W。造山金矿床的不寻常之处在于 Ni 和 Co 的强烈富集，这导致将 Mustajärvi 归类为具有非典型金属组合的造山金矿床。两种成矿方式的地球化学特征是典型的造山带金系统，具有很强的富集，包括 Au、B、Bi、CO2、Te 和 Se；和不太一致的异常数量的 Ag、As、Sb 和 W。造山金矿床的不寻常之处在于 Ni 和 Co 的强烈富集，这导致将 Mustajärvi 归类为具有非典型金属组合的造山金矿床。