江西相山铀矿田山南矿区控矿构造解析与找矿预测

Ore-controlling Tectonic Analysis and Ore-prospecting in Shannan Mining Area of Xiangshan Uranium Ore-field,Jiangxi

江西相山铀矿为与火山岩有关的中低温热液型矿床,断裂构造控矿特征明显。以相山铀矿田山南矿区为研究重点,开展控矿构造解析和构造控矿规律研究,旨在为隐伏矿床找矿预测提供科学指导。通过详细的野外观测和变形分析,揭示出山南矿区主要的控矿构造,即北北东向、东西—北西西向断裂破碎带都经历了早期压性和晚期张性-张扭性的破碎变形,构成了本区主要的容矿空间。在此基础上,分析了断裂控矿规律,推测破碎带的性质控制了铀矿体产出特征,构造通过控制岩石的变形行为而控制了铀矿体的产出,进而解释了所谓的"岩性控矿"观点。根据构造控矿规律及其控矿构造组合特征与区域综合找矿模型,认为横涧矿区的西南段、岗上英矿区与横涧矿区及石马山矿区的连接处等应为下一步找矿的首选有利区段,同时要注意寻找北北东向和东西—北西西向断裂复合部位的富、大矿体,并关注北北东向断裂成矿期后的活动对矿体的左旋错移情况。

The uranium ore in Xiangshan of Jiangxi is one of volcanic-related meso-epithermal deposits, and the ore-controlling characteristic of fault structure is significant. Ore-controlling tectonic analysis and tectonic ore-controlling regularity were studied in Shannan mining area of Xiangshan uranium ore-field in order to provide scientific guidance for ore-prospecting in blind ore deposit. Field detailed observation and measurement showed that the main ore-controlling structures in Shannan mining area including NNE- and EW-NWW-trending fault fracture zones had experienced compressional in early stage and later extensional to tran-extensional broken deformation, and therefore were favorable for uranium deposited. The rule of ore-controlling fault was discussed, and it was suggested that the output characteristic of uranium ore-body was mainly controlled by the property of fracture zone. Additionally, the output characteristics ofuranium ore-bodies in various rocks could be interpreted as the different deformation behavi, under tectonic stress, which could be helpful for understanding so-called lithologic o controlling. According to the regional ore-prospecting model with characteristic and regu pattern of ore-controlling structure, the preferred favorable sections included the southw section of Hengjian deposit, joint of Gangshangying, Hengjian and Shimashan deposits, e More attention should be paid to high-grade ore-bodies probably in the intersection of NNE- s EW-NWW-trending faults and the sinistral dislocation of ore-body affected by the activity af the metallogenic epoch of NNE-trending fault.