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首页> 外文期刊>Transactions of the Institutions of Mining and Metallurgy, Section B. Applied Earth Science >Structural controls on gold mineralization and ore body dissection: Bjorkdal mine, Skellefte, northern Sweden
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Structural controls on gold mineralization and ore body dissection: Bjorkdal mine, Skellefte, northern Sweden

机译：金矿化和矿体解剖的结构控制：瑞典北部Skellefte的Bjorkdal矿

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For over a decade Bjorkdal produced the highest annual tonnage of gold of any mine in Europe. Its Palaeo-Proterozoic ore deposits are hosted by shear-vein systems within grano-dioritic intrusive rocks and were complexly deformed and metamorphosed with surrounding volcanic-arc sequences during the Svecofennian orogeny. The economic potential of the mine relies, therefore, on accurate structural interpretations and three-dimensional models, which identify ore zone continuity and nearby satellite deposits. The authors have examined and mapped the structure in the open-pit and the surrounding region, logged more than 8000 m of drill core and conducted detailed SEM petrography. This has enabled them to identify structural controls on the mineralization process at micro- to mine-scale, and to characterize the kinematics and three-dimensional architecture of the ore deposits and the structures that deform them.The highest gold grades in the mine are coincident with steep, northeast-southwest-trending, meso-scale conjugate shear zones. In detail, gold mineralization is associated with microfractures in arrays of sub-vertical quartz veins within the shear zones. The echelon and conjugate arrangement of these veins, and the sense of vein rotation, mineral lineations and deflection of the contemporary shear-zone phyllonitic cleavages into spaced fabrics in the adjacent wallrocks consistently show the shear zones to be dip-slip extensional. Smaller-scale shear-sense indicators, some of which are associated with the gold-bearing microstructures, also indicate extensional kinematics. Gold mineralization was, therefore, syn-kinematic with development of these extensional shear zones.
机译：十多年来，比约克达尔的黄金年产量是欧洲所有矿山中最高的。它的古元古代矿石矿床是由花岗岩—闪长岩侵入岩中的剪切脉系统控制的，并且在Svecofennian造山运动中复杂地变形并变质为周围的火山弧序列。因此，矿山的经济潜力取决于准确的结构解释和三维模型，这些模型可以识别矿带的连续性和附近的卫星矿床。作者检查并绘制了露天和周围区域的结构图，记录了8000 m以上的钻芯，并进行了详细的SEM岩相学研究。这使他们能够识别微观到矿山规模的成矿过程的结构控制，并表征矿床的运动学和三维构造以及使它们变形的结构。矿山中最高的金品位是一致的具有陡峭的，东北-西南趋势的中尺度共轭剪切带。详细地讲，金矿化与剪切区内亚垂直石英脉阵列中的微裂缝有关。这些静脉的梯形和共轭排列，以及静脉旋转的感觉，矿物线和当代剪切带的系统发育性分裂成相邻围岩中间隔开的织物的偏斜一致地显示剪切带为倾滑延伸。较小的切变指示符（其中一些与含金的微结构有关）也指示了伸展运动学。因此，金矿化与这些伸展剪切带的发展是同动的。

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