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剪切带型金矿床中含金石英脉的一种可能成生机制
引用本文:邵世才,何绍勋.剪切带型金矿床中含金石英脉的一种可能成生机制[J].大地构造与成矿学,1994,18(2):155-162.
作者姓名:邵世才  何绍勋
摘    要:现在发现越来越多的产在太古代地块中的金矿床大多都是同构造剪切带型矿床,其容矿断裂是在区域构造应力作用下由液压致裂作用所形成,即含矿流体驱动裂纹的产生和扩展,并形成裂隙。而矿体中最重要的矿石类型──含金石英脉为同构造脉,即含矿流体紧随裂隙的张开而快速沉淀其中,形成含金脉体,并使裂隙愈合。含矿流体的不断补给和沉淀,使流体的压力发生周期性的波动,而这种波动的流体压力使"裂隙-脉体"系统发生周期性的裂开-愈合作用,由此形成了富金的多期多阶段的复式石英脉体。

关 键 词:剪切带型金矿床,同构造脉,液压致裂作用,裂开-愈合作用,小秦岭金矿区

FORMATION MECHANISM OF THE GOLD-BEARING QUARTZ VEINS IN SHEAR ZONE-TYPE GOLD DEPOSITS
Abstract:it is now found out that more and more gold deposits occurring in Archean massifs are almost syn-tectonic shear zone-type deposits. Their ore-hosted faults were formed by hydraulic fracturing during the driving of tectonic stress, that is, ore-bearing fluid promoted cracks to generate and propagate, and then form fractures. Once fractures were formed,ore-bearing fluid was quickly pumped into and precipitated in them, and then fractures were sealed. Unceasing supply and precipitation of the fluid produced cyclic fluctuations in fluid pressure, and they were shown to control the repeated "crack-sealing" of fracture-vein systems, and multiperiodic gold-bearing quartz veins were formed.
Keywords:Shear zone-type gold deposits  syn-tectonic quartz veins  hydraulic fracturing  crack-sealing  Xiaoqinling mine area
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