安徽枞阳城山地区地面伽玛能谱异常特征及成因分析

Features of anomalies in the ground gamma energy spectrum for the Chengshan area,Anhui and analysis of their genesis

枞阳县城山地区位于长江中下游地区庐江-枞阳中生代火山岩盆地东南缘黄梅尖-大龙山铀矿田中部,区内碱性花岗岩发育,属于江北A型花岗岩带的重要组成部分,区域铀成矿条件优越。为研究区内与A型花岗岩有关的铀异常特征,本次工作采用地面伽玛能谱测量对该区进行初步分析研究,后期在重点地段进行地质-能谱-岩石化探综合剖面测量,进一步研究区内铀矿化成因及控矿因素。通过研究发现,区内铀矿化主要分布于能谱U异常高值区,受岩体、地层、构造等联合控制,初步圈定两处找矿有利地段,为后期铀矿找矿提供指导。

The Chengshan area,Zongyang County is located in the middle of the Huangmeijian-Dalongshan uranium ore field on the southeastern margin of the Lujiang-Zongyang Mesozoic volcanic basin in the middle and lower reaches of the Yangtze River,where alkaline granite is developed as an important part of the Jiangbei A-type granite belt,and the regional uranium mineralization conditions are superior.In order to study the features of uranium anomalies related to A-type granite in the area,ground gamma spectrometric survey was conducted for preliminary analysis and research of the area.Later,a comprehensive profile survey of geology,energy spectrometry and petrogeochemistry was carried out in key zones to further study the genesis of the uranium mineralization and ore-controlling factors in the area.Through the study,it is found that uranium mineralization in the area is mainly distributed in the high-value area of uranium anomaly,which is jointly controlled by the rock mass,stratum and structure.Two favorable ore-prospecting areas are preliminarily delineated,providing guidance for the future uranium prospecting.