Structural control of gold-scheelite mineralisation in a major normal fault system, Barewood, eastern Otago, New Zealand
Structural control of gold-scheelite mineralisation in a major normal fault system, Barewood, eastern Otago, New Zealand
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新西兰奥塔哥东部巴雷伍德主要正断层系统对金白钨矿化的构造控制
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
D. Craw
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文献类型：
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作者：
D. MacKenzie;D. Craw
奥塔哥东部Barewood奥塔哥片岩中含金、白钨矿的石英脉位于区域规模的断裂带内，沿走向至少可追踪20公里。该地区的个别矿化断层可以沿着其西北走向绘制出长达10公里的地图。这些故障从一开始就是正常故障。早期运动包括距断层5m的相邻片岩的翘曲，以及向东北倾斜约50°的断层中的片岩的剪切。后来的运动完全是脆性的，以一些剪切和一组陡峭的(东北和西南方向高达80°)共轭断裂为特征。后期小幅运动沿中等东北向倾斜的剪切带发生。斯利肯赛德斯认为，运动的后期阶段涉及到重大的走滑运动，以及正常的成分。许多地方有两期石英脉，两种石英脉类型都含有金、白钨矿和硫化物。早期的石英脉是块状的。
Abstract Gold and scheelite bearing quartz veins in Otago Schist at Barewood, eastern Otago, are located in a regional scale zone of faults, which is traceable for at least 20 km along strike. Individual mineralised faults in the zone can be mapped up to 10 km along their northwest strike. The faults have been normal faults since their inception. Early movement involved warping of adjacent schistosity up to 5 m from the faults, and shearing of the schist in the faults, which dip about 50° northeast. Later movement was entirely brittle, and was characterised by some shears and a set of steeply dipping (up to 80° northeast and southwest) conjugate fractures. Minor late‐stage movement occurred along moderately northeast dipping shears. Slickensides suggest that later stages of movement involved significant strike‐slip motion as well as a normal component. Two stages of quartz veins occur in many localities and both quartz vein types contain gold, scheelite, and sulphides. The early quartz veins are massive w...