【作者】 汤静如；

【导师】 彭恩生；

【作者基本信息】 中南大学 ， 矿产普查与勘探， 2002， 硕士

【摘要】 本文所探讨的陕西双王含金角砾岩体的构造成因研究运用了水力压裂作用、流体动力角砾岩、流体泵吸作用、变形分解作用和雏形断裂理论等几个现代构造地质理论，提出了变形分解作用—雏形断裂作用—水力压裂作用—裂开愈合作用四位一体的水压角砾岩型咸矿构造模型，是与流体动力作用有关的裂隙—脉—角砾岩系成矿构造的一种新的模式。 论文在阐述了陕西双王含金角砾岩体的地质特征的基础上，提出双王含金角砾岩体为水力压裂成因角砾岩体。该水压角砾岩体是深源富碱含金流体在泥盆系一套热水沉积的富钠质岩系中发生水力压裂作用形成的。早期共轴递进挤压使能干性富钠质岩系与非能干性富泥质岩系发生变形分解，分别形成近等距分布的透镜状弱变形域与线性强变形带。强变形带中的非能干性泥质岩系强烈劈理化，为相对高温高压带；弱变形域内的能干性钠质岩系则伴随弱水力压裂作用发生扩容，形成雏形断裂的微裂隙，同时，它是一个相对低温、低压、高渗透率的透镜状天然泵吸中心。晚期的右旋高角度斜冲非共轴递进剪切，使水力压裂作用沿弱变形域中央最发育的一组檄裂隙大规模发生，并沟通深部的裂隙系统。泵吸中心巨大的压力降使深部的承压流体在富钠质岩系中产生周期性的构造泵吸—水力压裂—沉淀愈合作用。根据构造模型预测的隐伏含金水压角砾岩体己获钻探初步验证。更多还原

【Abstract】 During the process of studying tectonic origin of Gold-bearing breccia bodies in the Shuangwang gold deposit ,Shanxi province, the author apply several modern tectonics theories, such as hydrofracturing, fluid dynamic breccia, tectonic pumping, deformation partitioning, embryonic fracture etc. The paper presents an kind of new model for the formation of hydrofracturing breccia-type metallotectonic, which is one of fracture-vein-breccia series metallotectonics concerning fluid, by deformation partitioning, embryonic fracture, hydrofracturing and rupture-healing.Based on the geological feature of Gold-bearing breccia bodies in the Shuangwang gold deposit ,Shanxi province, author identified it to be hydrofracturing breccia bodies, are formed by hydrofracturing of the deep-seated gold-bearing and alkali-rich fluids in the Devonian hydrothermal sodium-rich rock series. In the early period, the progressive cosxial compression caused the competent sodium-rich series and the uncompetent pelitic series to deform and partition, forming a lens-like weak-deformation domain distributed at approximate equidistance and a lineat srong-deformation zone respectively. Among them, the uncompetent pelitic series are cleaved in the srong-deformation zone with relatively high temperature, high pressure; With weak hydrofracturing, the competent sodium-rich series dilatacying and forming microfracture(ie,embryonic fracture) in the core of the weak-deformation demain,which is a natural lens-like pumping centre with relatively low temperature, low pressure and high permeability. In the late peroid, the progressive uncoaxial shear of right-lateral and high-angle oblique thrusting caused hydrofractuing along the most developed joints and fractures in the core of weak-deformation domain ,and linked up with deep fracture systems. The large pressure decline in the pumping centre caused the deeped-seated confined fluids to develop periodic tectonic pumping, hydrofracturing and precipitation healing in the sodium-rich rock series. The buried gold-bearing hydrofracturing breccia bodies predicted on the basis of the partitioning deformation tectonic type have been proved by drilling.更多还原