Black shales may serve as an important source of metals such as Co, Ni, or As, largely due to anoxic to euxinic conditions in association with high concentrations of sulfur leading to efficient scavenging and transport of metals from seawater into the seafloor sediment. We report on an unusual type of Au mineralization newly discovered in Ediacaran trench-slope black shales in the Bohemian Massif, Czech Republic. The Au enrichment is related to the formation of a quartz–sulfide vein system and a progressive evolution of ore-forming fluids with decreasing temperature, from Sb- to As-rich to final precipitation of native gold from silica and Au-bearing low-temperature hydrothermal colloidal solutions. The hydrothermal nature of these solutions is also documented by Li contents and isotope compositions which differ markedly between barren black shales and those carrying significant late-stage quartz-rich veins. The structural relationships and orientation of the associated quartz veins point to a close connection between vein emplacement and high heat flow in response to Ordovician rifting, and breakup of the northern margin of Gondwana, and opening of the Rheic Ocean. This triggered metal and sulfur remobilization, including Au, from the associated Neoproterozoic–Cambrian volcanosedimentary successions. The documented Au mineralization and its association with the Ordovician rift-related magmatic activity is different from the widespread Variscan Au occurrences in the Bohemian Massif. Our study thus provides a new genetic model potentially important for future exploration of Au also in other terrains underlain by a rifted Cadomian basement.

黑色页岩可能是 Co、Ni 或 As 等金属的重要来源，这主要是由于与高浓度硫相关的缺氧到黑质条件，导致金属从海水中有效清除和运输到海底沉积物中。我们报告了在捷克共和国波希米亚地块的埃迪卡拉纪沟槽斜坡黑色页岩中新发现的一种不寻常类型的金矿化。Au 富集与石英-硫化物脉系统的形成和成矿流体随着温度的降低从富 Sb 到富 As 到最终从二氧化硅和含 Au 低温中析出天然金有关。热液胶体溶液。这些溶液的热液性质也通过 Li 含量和同位素组成进行了记录，这些成分在贫瘠的黑色页岩和那些携带重要的晚期富石英脉的页岩之间存在显着差异。相关石英脉的结构关系和方向表明，响应奥陶纪裂谷、冈瓦纳北缘裂解和 Rheic 洋开放，脉就位与高热流之间存在密切联系。这触发了相关的新元古代-寒武纪火山沉积层序中的金属和硫（包括 Au）的再活化。记录在案的金矿化及其与奥陶纪裂谷相关岩浆活动的关联不同于波希米亚地块中广泛存在的华力西金矿。