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首页> 外文期刊>Economic geology and the bulletin of the Society of Economic Geologists >Lithological and Structural Controls on the Form and Setting of Vein Stockwork Orebodies at the Mount Charlotte Gold Deposit, Kalgoorlie
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Lithological and Structural Controls on the Form and Setting of Vein Stockwork Orebodies at the Mount Charlotte Gold Deposit, Kalgoorlie

机译：卡尔古利山夏洛特山金矿床静脉储层脉状构造的形态和构造的岩性和结构控制

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The Mount Charlotte quartz vein gold depositcomprises a series of steeply plunging, pipelike vein stock-workorebodies in massive metagabbro. The orebodies are stratabound to the most differentiated unit of the host sill and aretypically adjacent to major steeply dipping faults that cut the sill.The stockworks have two sets of veins with a dihedral angle ofabout 50 deg that developed as hydraulic fractures, filledsimultaneously, and are generally approximately equallydeveloped. Veins crosscut major faults and parallel minor faultsof two sets but are cut along reactivated fault surfaces. The faultsets were inactive during mineralization and are neither veinednor are loci of zones of intense alteration. Rare faults of a thirdset are in part veined and are loci of zones of mineralization.Two interpretations of the stress regime during vein formationare based on different models of fracture formation. For bothstress regimes, the major fault sets are relatively unfavorablyoriented for slip or dilation, and predicted movement vectors donot fit fault-plane lineations. The lack of fault activity during orefluid flow promoted formation of vein stockworks at MountCharlotte rather than shear zone or fault-hosted veins. Fluid flowpaths and orebody siting are controlled by stress-guide effectsdue to the rheology of the host gabbro, and by the three-dimensional geometry of impermeable faults and of fault-bounded blocks of rock.
机译：夏洛特山石英脉金矿床由大量的成矿物质组成，一系列陡峭的，呈管状的脉状储矿体。矿体与东缘基岩的差异最大的单元地层相连，通常与切开基岩的主要陡倾断层相邻。储层有两组脉，二面角约为50度的水脉发育成水力压裂，同时充满。通常大致相等。静脉横切了两组的主要断层和平行的次要断层，但沿重新激活的断层面切割。断层在矿化过程中不活跃，也没有脉动，也不是强烈蚀变带的位点。第三组的罕见断层是部分脉状的，是矿化区的位点。对静脉形成过程中应力状态的两种解释基于不同的裂缝形成模型。对于两种应力形式，主要断层集相对不适合滑动或扩张，并且预测的运动矢量不适合断层平面线型。矿液流动过程中断层活动的缺乏促进了芒特夏洛特的静脉储层的形成，而不是剪切带或断层携带的静脉。流体的流动路径和矿体的选址受宿主辉长岩流变的应力引导作用以及不可渗透断层和断层边界岩石块的三维几何形状的控制。

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