构造成矿非线性动力学:2.湘西金矿研究实例

应用递增应力流变学方法对湘西沃溪金矿成矿过程中构造变形、应力、流体流动、地球化学反应及成岩成矿作用等多过程间的耦合作用和非线性特征进行了模拟和分析。构造压溶作用对矿源层中成矿物质的溶解与迁移起了重要作用。断裂作用可以产生比原岩渗透率高近4个数量级的断裂渗透率,从而促进流体的流动、组分扩散和在断裂中的汇聚成矿。不同岩性对断裂作用和断裂渗透率的演化有重要影响,并且构造、流体、岩石之间存在强烈的非线性耦合作用,马底驿组中段是最有利的构造成矿层位。

NONLINEAR DYNAMICS OF TECTONIC MINERALIZATION: 2. THE STUDY CASE FOR XIANGXI Au DEPOSIT, HUNAN, CHINA

The coupling of many geological proc esses such as structural deformatio n,stress,fluid flow,geochemical reaction and diagenesis and mineralization and nonlinear p roperties are simulated and analyze d using incremental stress rheology a pproach for the Xiangxi Au deposit,Western Hunan,China.The tectonic pressure dissolution plays an important role in dissolution and transport of ore-forming matter in source bed.Fracturing can bring high fracture p ermeability that is about 4orders of magnitude higher than the permeability of wall rock and facilitating fluid flow and focusing and mi neralizing in fracture zone.The fracturing and the evolution of frac ture permeability of different rock s are different.Tectonics,fluid an d rock exhibit strange nonlinear coupling,and the Mid member of the Madiyi form ation is a favorable horizon for tectonic mineralization.