论文部分内容阅读
法国中央地块和比利牛斯山脉中Saint-Salvy锌矿床及其它海西期脉状矿床的构造研究,揭示出在流变控制作用下矿化构造的四阶段演化:(1)引起应力应变扰动的第一级序岩石或构造的不均一性控制潜在成矿区定位;(2)相应于流变非连续性的固结剪切带之第二级序岩石和构造的不均一性产生;(3)第二级序不均一性的构造活动造成孔隙张开,促使热液流体循环和金属矿物的周期性沉淀;(4)作为薄弱带活动的各向异性面的活化引起成矿构造的再造和部分破坏。先存的第一级序的不均质体和区域剪切应变之间相互作用引起的不稳定,依次产生第二级序及低序次的非均质性。这种逐步形成的小型不均质体引起构造扰动逐渐向定位中心集中,成为热液流体的通道。这就是低级别和晚期构造优先富含经济矿化的原因。
The study of the structure of the Saint-Salvy-Zinc deposit and other Hercynian vein-type deposits in the French central massif and the Pyrenees reveals a four-stage evolution of mineralization under rheological control: (1) stress-strain The perturbed first-order rocks or structural inhomogeneities control the potential mineralization locality; (2) the second-order rock and structural inhomogeneity of the consolidation shear zone corresponding to the rheological discontinuities; ( 3) structural activity of the second order inhomogeneity leads to the opening of pores to promote hydrothermal fluid circulation and the periodic precipitation of metal minerals; (4) activation of anisotropic facies as a weak zone causes reworking of metallogenic structures And partially destroyed. The instability caused by the interaction between the pre-existing first-order inhomogeneous bodies and the regional shear strain results in the second-order and low-order heterogeneities in turn. The gradual formation of small inhomogeneous bodies causes structural perturbations to gradually converge toward the center of localization and become channels for hydrothermal fluids. This is why low-level and late-stage structures are preferentially enriched with economic mineralization.