【摘要】 厂坝一李家沟矿床为规模大、品位富、分布集中的层控型铅锌矿床。主要成矿作用发生在沉积—成岩阶段,矿带受裂谷海槽内次级同生断裂及伴生的沉积盆地控制。矿带内一组走向北东的同生断裂带及次级洼陷和隆起,控制着岩相带的发育和矿床规模。矿带内主要矿体赋存于碎屑岩向碳酸盐过渡的岩相带内,并受到后期变质热液、层间断裂的改造富集。 厂坝一李家沟铅锌矿床的同生断裂,是喷气沉积成矿阶段含矿热卤水的通道;属海底喷气一沉积受变质型矿床。更多还原

【Abstract】 The deposits are stratabound lead zine deposits with large scale, rich tenor and concentrating distribution. The main metallogenesis occurs in sedimentation-diagenesis stage. Mineralization zone is controlled by the secondary grade of contemporaneous faults and the sedimentation basin accompanied in rift trench. The development of the lithofacies and the scale of the deposits are controlled by a group of NE contempo -raneous faults and secondary grade of depression and upwarp in the area. The main orebodies within the mineralizatim zone occurred in a transitional lithofacies zone from clastic rock to carbonatite, which was reformed and enriched by later metamorphic-hydrothermal process and interformational fault.It is considered that the syngenetic faults of the deposits in Changba Lijiagou area are the tunnel of ore -bearing hot brine at the stage of exhalation-sedimentation and mineralization. The deposits to sea-floor exhalation-sedimentation metamorphism type of deposits.更多还原