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五台山绿岩带中 ,与变质火山 沉积岩系直接相关的金矿化分布广泛 ,具有多种成矿和控矿机制。但就两种主要类型金矿———剪切带型金矿和铁建造型金矿的时空分布、地质特征和赋存的构造部位来看 ,它们都明显地与剪切变形 (韧性的或脆性的 )所产生的构造 热液活化作用有关 ,具显著的构造控矿意义。区域构造分析表明 ,五台山绿岩带的构造格架是一个多级和多期褶皱与断裂的组合 ,总的构造样式是一个紧闭程度向中心增强的复式倒转向形。它们是在北西 南东向挤压作用下递进变形的结果。在这一区域应力场作用下 ,处于不同构造部位的岩石发生变形分解作用 ,从而在紧闭褶皱的翼部产生一系列剪切变形带 ,构成了五台山绿岩带构造控矿机制。本文将以两类绿岩金矿的典型矿床为例 ,对这一控矿构造机制进行全面分析。
Among the greenstone belts in Wutai Mountain, the gold mineralization directly related to the metamorphic volcanic sedimentary rocks is widely distributed and has various metallogenic and ore-controlling mechanisms. However, in view of the temporal-spatial distribution, geological characteristics and occurrences of the two main types of gold-bearing shear-type gold deposits and iron-built gold deposits, they are clearly associated with shear deformation (ductile or Brittle) generated by tectono-hydrothermal activation, with significant structural significance of ore-control. The regional tectonic analysis shows that the tectonic framework of the Wutai greenstone belt is a combination of multi-stage and multi-stage folds and faults, and the general tectonic pattern is a multi-fold reversal with a tight center to the tightness. They are the result of progressive deformation under the squeezing of northwestern Southwest. Under the action of the stress field in this region, the rocks in different tectonic parts deform and decompose, resulting in a series of shear deformation zones in the wing of the tight folds, forming the ore-controlling mechanism of the green belt in the Wutai Mountain. This article will take two types of typical deposits of Greenstone gold deposit as an example to conduct a comprehensive analysis of this ore-controlling mechanism.