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闹阳坪锌萤石矿床位于北大巴山逆冲推覆褶皱带平利隆起东侧,为该区首次发现的受构造裂隙控制的气水–热液型锌萤石矿床。本文从矿区断裂入手,通过对该区矿床地质、断裂特征、矿体特征的研究,总结了该区断裂的演化序列及其对成矿的控制机制与规律。认为NW-SE向断裂组是矿区的主要控矿构造,矿区断裂变形发育演化序列为晚印支–早燕山期形成近EW向断裂F1,早燕山期形成NW-SE向断裂F7和NE-SW向断裂F4,随后的右行走滑作用叠加有张扭性应力,形成有利于成矿热液运移充填成矿的张扭性右行走滑断裂。并明确了成矿期应变椭球体,恢复了成矿期主压应力方向为NNW向(340°~350°)。在此基础上,预测平面上闹阳坪矿区F7与F8断裂之间为下一步找矿重点地段,剖面上K3萤石矿体下伏北东方向可能存在隐伏矿体。
The Yanyingping zinc-fluorite deposit is located on the east side of the Pinglilong uplift in the North Dabashan thrust nappe belt, which is the first discovery of the gas-water hydrothermal-type zinc-fluorite deposit controlled by structural fractures in this area. Based on the study of the geology, fracture characteristics and orebody characteristics of the ore deposit in this area, the paper summarizes the evolutionary sequence of the faults and the control mechanism and rules of the ore-forming in this area. It is considered that the NW-SE trending fault zone is the main ore-controlling structure in the mining area. The evolution sequence of the fault deformation in the mining area is the formation of nearly EW fault F1 in the late Indosinian-Early Yanshanian period and the NW-SE fracture F7 and NE-SW in the early Yanshanian period To the fracture F4, the subsequent right-lateral slip is superimposed with tensile and torsional stresses to form a tension-dextral right-slip strike-slip fracture that is favorable for the metallogenic hydrothermal migration and mineralization. And clarified the stratiform ellipsoid during mineralization. The direction of the principal compressive stress in the mineralization was restored to NNW (340 ° ~ 350 °). On the basis of this, it is predicted that there will be a concealed orebody in the northeast of the K3 fluorite orebody in the section between the F7 and F8 faults in the Yanyingping mining area on the prediction plane.