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基于对马脑壳金矿床构造变形分析及流体包裹体研究 ,探讨了马脑壳金矿床形成过程和热液成矿机制 ,认为自印支运动以来 ,该区先后经历了韧性、韧 -脆性及脆性等多期构造变形演化过程 ,并伴有多次热液活动。热液的来源及性质与构造变形作用密切相关 ,早期韧性构造变形期 ,热液来源以地层建造水和变质水为主 ,而韧 -脆性变形期以来大气降水不断加入并逐渐占据优势。由韧性→韧 -脆性和韧 -脆性→脆性构造变形机制的转变 ,引起热液发生混合及相分离作用 ,并导致热液体系 T、p H、fo2 、fs2 等物化条件降低变化 ,造成热液中含金络合物溶解度大幅度下降而发生沉淀成矿作用。概括总结了马脑壳金矿床构造 -流体 -金成矿作用系统演化模式。
Based on the tectonic deformation analysis and fluid inclusions in the Magnau gold deposit, the formation process and hydrothermal mineralization mechanism of the Magnau gold deposit are discussed. It is believed that the region has experienced toughness, toughness-brittleness and brittleness since the Indo-Chinese Movement Multi-stage deformation and evolution process, accompanied by multiple hydrothermal activities. The source and properties of hydrothermal fluids are closely related to the tectonic deformation. During the early ductile tectonic deformation period, the source of hydrothermal fluids is mainly the formation water and metamorphic water, while the precipitation of the meteoric water is gradually added and gradually dominated by the ductile-brittle deformation period. The transition from ductile → ductile-brittle and ductile-brittle-brittle to brittle structural deformation causes mixing and phase separation of hydrothermal fluids and leads to the decrease of the physical and chemical conditions such as T, p H, fo2, fs2 and other hydrothermal fluids, In the gold complex solubility significantly reduced the occurrence of precipitation mineralization. This paper summarizes the systematic evolution of the structure-fluid-gold mineralization in the Magna Gold deposit.