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首页> 外文期刊>Science in China. Series D, Earth sciences >Transport network and flow mechanism of shallow ore-bearing magma in Tongling ore cluster area
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Transport network and flow mechanism of shallow ore-bearing magma in Tongling ore cluster area

机译：铜陵矿团簇区浅部含矿岩浆的运输网络和流动机制

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Abundant studies revealed that shallow intrusions of the Yanshanian epoch resulted in the mass mineralization of the Tongling region. Various evidences showed there existed a concealed magma chamber at -10 km depth in the middle part of this region during Yanshanian epoch, from which the ore-forming magma was generated and then transported to the superficial layer. Yet the transport network and flow mechanism of the shallow ore-bearing magma, the key problem associated with ore-forming process, was relatively little focused on. Integrate analysis of structural mechanics, statistical fractal and geological facts suggested that NE trending high-angle fold-related thrust faults and the tessellated basement ones served as the main pathways for the shallow magma's transporting, moreover, the saddle void spaces among adjacent strata in the folds upon this fault system provided the place for magma's emplacement. So the folds in the upper part and faults in the lower part of the upper crust constituted the fluid's transport and emplacement network. During the deformation of geologic body with multi-layer structure, the layers in the upper part tended to fold when received the jacking stress from the lower part, while the lower one inclined to fault undergoing loads of the upper part. And the producing probability of this structure assemblage was highly increased in the condition, such as in the Tongling area, that the mechanic rigidity of the lower layers was stronger than that of the upper ones. For the pre-existence of fluid-conducting network, the top magma with high volatile in the magma chamber transported rapidly to the superficial layer in dyking pattern, located in the void spaces of folds, filled and reconstructed them. The sudden drop of pressure caused the fluid unmixing from the magma and mass ore-forming elements concentration. Pulse activity of the dyking may be the principal reason why magmatic bodies in the Tongling area were spatially-temporally concomitant and limited flux in chemical compositions.
机译：大量研究表明，燕山期的浅层侵入导致铜陵地区大量成矿。各种证据表明，在燕山时期，该区域的中部在-10 km深度处有一个隐伏的岩浆室，从中产生成矿岩浆，然后运到表层。然而，浅部含矿岩浆的运输网络和流动机制是与成矿过程有关的关键问题，相对而言却很少关注。对结构力学，统计分形和地质事实的综合分析表明，NE向高角度褶皱相关的逆冲断层和细分的基底断层是浅岩浆运移的主要途径，而且是该岩体相邻地层之间的鞍状空隙空间。该断裂系统上的褶皱为岩浆的安放提供了场所。因此，上地壳的上部褶皱和下部的断层构成了流体的输运和沉积网络。在具有多层结构的地质体变形过程中，上部受到来自下部的顶升应力时，上部层趋于折叠，而下部则倾向于承受上部载荷的断层作用。而且在铜陵地区这样的条件下，这种结构组合的生产可能性大大增加了，下层的机械刚度要强于上层的机械刚度。由于存在先导流体网络，岩浆室内挥发性高的顶岩浆以褶皱的方式迅速运移至表层，位于褶皱的空隙中，充填并重建。压力的突然下降导致流体从岩浆和成矿成矿元素集中解开。脉动的脉动可能是铜陵地区岩浆体在空间上随时间变化并在化学成分上受到限制的主要原因。

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