Abstract In the Val-d’Or mining district of the Archean Superior Province, the relationship between regional metamorphism/deformation and the timing of orogenic vein-type gold mineralization is debated; some authors arguing that gold mineralization was coeval with the regional D2 deformation event and broadly synchronous with metamorphism, and others suggesting that it is 60 to 100 Ma younger than peak metamorphism. Using the 40Ar/39Ar method and the compilation of U-Pb or Pb-Pb ages of ore-related minerals, this contribution presents a geochronological study on the timing and the inferred duration of the formation of vein-type gold deposits hosted by the Bourlamaque pluton in the Val d’Or mining district. We present an extensive set (49 samples) of 40Ar/39Ar CO2 laser probe data acquired on amphibole and white mica single grains from three major gold deposits, the Lac-Herbin, Beaufor and Beacon-2 mines. In each deposit, gold mineralization is host by shear and extensional quartz veins associated to steeply south-dipping networks of ductile shear zones. Barren north-dipping faults also occur at each deposit and are attributed to post-mineralization structural event(s). Amphiboles 40Ar/39Ar analyses yield magmatic crystallization ages clustering around 2704 Ma and preserve evidences for at least two subsequent disturbances linked to probable hydrothermal circulation events at c. 2667 Ma and c. 2652 Ma. White micas 40Ar/39Ar age spectra from auriferous quartz veins and hosting mylonitic shear zones are typical of long-lasting and sequential dynamic recrystallization and suggest that Au-bearing hydrothermal circulation was establish, at least, around c. 2650 Ma, and followed by a succession of hydrothermal pulses at c. 2597, 2575, 2551, 2500 and 2452 Ma. 40Ar/39Ar ages distribution among the different deposits as well as between the auriferous quartz veins and hosting shear zones are consistent with fluids production and circulation along an active network of seismically active fault zones.

中文翻译：

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加拿大阿比蒂比 Val d'Or 矿区 Bourlamaque 岩体中太古代造山金矿床的时间和持续时间

摘要 在太古宙优越省 Val-d'Or 矿区，区域变质/变形与造山脉型金矿化时间的关系存在争议；一些作者认为金矿化与区域 D2 变形事件同时期并与变质作用大致同步，其他人认为它比峰值变质作用年轻 60 至 100 Ma。使用 40Ar/39Ar 方法和与矿石相关矿物的 U-Pb 或 Pb-Pb 年龄的汇编，该贡献提供了对 Bourlamaque 托管的脉状金矿床形成时间和推断持续时间的地质年代学研究Val d'Or 矿区的岩体。我们展示了从三个主要金矿 Lac-Herbin、Beaufor 和 Beacon-2 矿的闪石和白云母单颗粒上获得的广泛的一组（49 个样本）40Ar/39Ar CO2 激光探针数据。在每个矿床中，金矿化的主体是剪切和伸展石英脉，这些脉与韧性剪切带的陡峭南倾网络相关联。贫瘠的北倾断层也出现在每个矿床中，并归因于矿化后的构造事件。角闪石 40Ar/39Ar 分析产生聚集在 2704 Ma 附近的岩浆结晶年龄，并保留了至少两个与 c 可能的热液循环事件相关的后续扰动的证据。2667 马和 c。2652 马。来自含金石英脉和宿主糜棱质剪切带的白色云母 40Ar/39Ar 年龄光谱是典型的持久和连续动态再结晶，表明含金热液循环至少在 c. 左右建立。2650 Ma，然后是 c. 的一系列热液脉冲。2597、2575、2551、2500 和 2452 Ma。不同矿床之间以及含金石英脉和承载剪切带之间的 40Ar/39Ar 年龄分布与沿地震活动断层带活动网络的流体生产和循环一致。