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首页> 外文期刊>Journal of structural geology >Structural and mechanical controls on intrusion-related deposits of the Tombstone Gold Belt, Yukon, Canada, with comparisons to other vein-hosted ore-deposit types
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Structural and mechanical controls on intrusion-related deposits of the Tombstone Gold Belt, Yukon, Canada, with comparisons to other vein-hosted ore-deposit types

机译：加拿大育空的墓碑金矿带与入侵有关的矿床的结构和机械控制，以及与其他脉状矿床类型的比较

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Intrusion-related gold deposits at the Clear Creek, Scheelite Dome and Dublin Gulch properties of the Tombstone Gold Belt (TGB), Yukon Territory have dominantly E-striking, steeply dipping, auriferous quartz extension veins within intrusions. In adjacent metasedimentary rocks gold is hosted in subvertical NW- to NNW-striking sinistral faults as veins and breccias, in E-striking extension veins and locally in E- to ENE-striking fault veins. These structural relationships indicate low magnitude, broadly E-W-directed shortening and N-S extension during stock emplacement and gold mineralisation at ～ 92 Ma. The lack of any deviation or deflection of the extension vein orientations in the country rocks, with respect to their orientation within the stocks, indicates consistent stress trajectories in both rock types. These TGB deposits formed at 5-8 km depth, where mean and differential stresses may be greater in magnitude than in shallower porphyry environments. Many porphyry systems feature magmatic-related stresses that dominated the local stress field, with more variable vein orientations the result. Conversely, orogenic gold systems usually exhibit strong dimensionality in vein orientations. Fault-hosted mineralisation in metasedimentary rocks of the TGB deposits in this study is comparable in geometry, but generally smaller in size than in many orogenic gold systems. Intrusion-related systems of the TGB exhibit intermediate structural styles of mineralisation that provide a useful bridge in understanding the diversity of mechanically controlled structural styles in otherwise mostly unrelated gold deposit types.
机译：育空地区墓碑金带（TGB）的Clear Creek，Scheelite Dome和Dublin Gulch属性中与侵入有关的金矿床中，侵入岩中主要以电子冲击，陡倾，无色石英延伸脉为特征。在相邻的沉积沉积岩中，金矿存在于垂直走向的西北至近西北走向的窦性断层中，如静脉和角砾岩，E向延伸的脉中以及局部存在于E向ENE断裂带中。这些结构关系表明，在〜92 Ma的储层和金矿化过程中，幅度较小，大体上由E-W定向缩短和N-S扩展。相对于其在储层中的定向，乡村岩石中的延伸脉走向没有任何偏差或偏斜，表明两种岩石类型的应力轨迹一致。这些TGB沉积物形成在5-8 km的深度，与浅斑岩环境相比，平均应力和微分应力的强度可能更大。许多斑岩系统都具有与岩浆有关的应力，这些应力主导了局部应力场，结果导致了更多的静脉走向。相反，造山金系统通常在脉动方向上表现出很强的维数。在这项研究中，TGB沉积的准沉积岩中的断层成因的矿化在几何学上是可比的，但其大小通常比许多造山金系统小。 TGB的与入侵有关的系统显示出矿化的中间结构样式，这为理解其他情况下几乎无关的金矿类型中机械控制的结构样式的多样性提供了有用的桥梁。

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