粤北希望矿床外围铀矿化特征与找矿前景

Uranium Mineralization Characteristics and Prospecting Prospects on the Periphery of Xiwang Deposit in Northern Guangdong,China

希望矿床是华南花岗岩地区极具代表性的铀矿床之一,处于下庄矿田北部,成矿地质条件优越。矿床外围北东段勘查工作程度较低,通过对其铀矿化特征开展系统研究,探讨其找矿前景颇具现实意义。在总结和分析已有资料的基础上,经过系统的野外地质调查、物化探剖面测量、钻孔编录、样品采集与分析鉴定等,以及对岩性、蚀变、构造、矿体等地质特征及物化探异常特征的分析,研究了希望矿床外围北东段铀矿化特征及找矿前景。结果表明,区内具备“复式岩体、断裂构造、热液蚀变”三位一体的成矿有利条件,主要断裂及次级断裂带附近存在叠合较好的能谱铀异常、氡气异常以及铀分量异常,综合分析认为希望矿床外围北东段成矿潜力较大,指出86号断裂带与竹山下辉绿岩交汇部位、92号断裂带与A11号断裂带交汇部位具有很好的找矿前景。

Xiwang uranium deposit,one of the representative granitic type uranium deposits with excellent conditions for mineralization,is located in the northern part of Xiazhuang uranium orefield,South China.The northeast section of the periphery of this uranium deposit has been poorly studied.It is of practical significance to explore its prospecting prospects through systematic research on its uranium mineralization characteristics in the periphery of Xiwang deposit.By summarizing and analyzing the existing data,the characteristics and prospecting prospect were studied with systematic field geological survey,geophysical and geochemical prospecting profile measurement,borehole cataloging,sample collection,analysis and identification,etc.,as well as the analysis of lithology,hydrothermal alteration,structure,ore body and other geological characteristics and geophysical exploration abnormal characteristics.The results indicated that the most potential mineralization area,which is located in the northern part of Xiazhuang uranium orefield,has favorable conditions for mineralization with the trinity of"complex pluton,fault structure and hydrothermal alteration",well overlapped anomalies of energy spectrum,radon gas and partial uranium content near the main and secondary fracture zones.The good prospecting prospects were predicted at the intersection of fault zone No.86 across Zhushanxia diabase pluton,and fault zone No.92 across fault zone No.A11.