高温高压高应变速率干体系中黄铁矿内的晶格金的动力迁移机制理论探讨

DYNAMIC TRANSPORT MECHANISM OF LATTICE GOLD IN PYRITE AT HIGH TEMPERATURE-HIGH PRESSURE ANHYDROUS CONDITIONS AND AT HIGH STAIN RATE

分析了高温高压高应变速率条件下黄铁矿中的晶格金迁移的动力学机制后认为 :黄铁矿晶格中的金原子趋向于向位错等缺陷处扩散 ;在无位错滑移的情况下 ,晶格金原子在位错线等缺陷中扩散的扩散方式对其从黄铁矿内部迁移出来无实际意义 ;在高温高压高应变速率 [( 1 0 - 8～ 1 0 - 4) /s]条件下黄铁矿变形以位错滑移为主 ,金原子伴随着位错滑移一起迁移 ,最终迁移进入裂隙 ,增加了与成矿流体接触的机会。

Research on the dynamic transport mechanism of lattice gold in pyrite has been carried on at high temperature\|high pressure anhydrous conditions and at high stain rate. The paper indicates that the lattice gold in pyrite tends to diffuse toward defects such as dislocations. It is of no significance that gold is transported from the inside of pyrite in which gold atoms diffuse via defects such as dislocations if there is no dislocation sliding in the pyrite. Gold atoms can move out of the pyrite with dislocation sliding at high temperature\|high pressure anhydrous conditions and at high stain rate (10\+\{-8\}-10\+\{-4\}s\+\{-1\}), which is believed to occur in zones of intense shearing deformation, and move into cracks, thus enhancing the chance for gold atoms to get in touch with fluid.