相山西部河元背地区深部地质构造特征研究及铀成矿预测

Deep geological structure features and prediction of uranium mineralization in Heyuanbei belt No.8,west of Xiangshan field

相山西部断裂构造发育,NE向与NW向断裂组成多个菱形断块。河元背8号带地区位于河元背菱形断块内部,具有较好的成矿地质条件,该区经历数轮铀矿地质勘查工作,目前已落实为小型矿床。随着该区勘查深度逐渐加深,已揭露的铀矿化垂幅近千米,显示深部仍具有较好的铀矿化信息及较大的找矿潜力。为查清河元背8号带深部地质结构特征及铀矿化富集规律,预测找矿有利部位,实现深部找矿突破,基于GOCAD三维软件平台,构建河元背8号带-1000 m以浅三维地质模型。通过三维模型,大致查明研究区构造、地层、隐伏岩体的深部空间形态和延伸情况;查明铀矿体与构造、地层和深部隐伏岩体之间的空间关系,确定铀矿体空间定位条件;根据铀矿体空间定位条件,结合研究区目前的勘查程度,在模型中预测并圈定铀成矿有利部位1处,为研究区铀矿勘查钻探工程设计提供依据。由于相山西部地区铀矿化多与火山岩岩性界面和构造界面关系密切,该三维找矿预测方法可应用于相山西部其他勘查区,指导勘查钻探工程设计。

The western part of Xiangshan uranium ore field is characterized by the well development of the north-east and north-west striking faults which form a number of rhombic fracture blocks.The belt No.8 is located in the rhombic fault blocks of Heyuanbei,which is believed with good metallogenic geological conditions and a small deposit was discovered after several rounds of uranium geological exploration.However,the depth exploration in this area has indicated that the good uranium mineralization and great prospecting potential still occurs in the deep part.In order to find out the deep geological structure characteristics and favorable prospecting position of uranium mineralization enrichment law of the belt No.8 of Heyuanbei,a three-dimensional geological model below-1000 m was constructed based on GOCAD 3D software platform.Through the 3D model,the deep spatial morphology and extension of the structure,strata and concealed pluton were roughly identified,and their spatial relationship to the uranium ore bodies was identified,and the spatial localization conditions of the uranium ore bodies were determined.According to the spatial localization conditions of the uranium ore bodies,one favorable sites for uranium metallization were predicted and circled in the model to provide a basis for the design of uranium exploration drilling efforts.Since the uranium mineralization in the western part of Xiangshan ore field is closely related to the interface of volcanic rocks and structure interfaces,the three-dimensional mineralization prediction method can applied to other exploration areas in the western part of Xiangshan ore field,to guide the design of exploration and drilling engineering.