[Objective]The Hetaoba area in Inner Mongolia has superior uranium metallogenic conditions.Grea tore-prospecting results have been achieved in the eastern part of the study area.However,breakthrough has not been made in the western area.Uranium mineralization is significantly controlled by faults and fractured zones.To identify the distributions of fault framework,structural fracture and alteration zones,and further to infer the favora-ble metallogenesis areas,geophysical data are provided to explore the uranium metallogenic potential.[Methods]Through the comprehensive applications of three geophysical methods,including audiomagnetotelluric surveys,soil radon measurements,and ground high-precision magnetic measurements,soil radon anomalies are delineated in the study area.The northwest fault F13 shows a northeast-and northwest-trending with a Chinese word"Tian"grid shape,while the southeast fault F12 presents a northeast-trending grid shape.The faults of F13 and F12 present nearly north-south and northwest trendings in the pinched zones.There are six structural alterated and fractured zones to be inferred.[Results]Based on the characteristics of uranium mineralization,it is inferred that the structural altera-tion and fracture zones of S1,S2,S3 and S4 are located at the intersection and pinched zone of faults,with a large scale.Multiple soil radon anomalies are distributed with an anomaly amplitude up to 35 000 Bq/m3,which are the favorable areas for metallogenesis.[Conclusion]After verification of the drilling results,the structural alteration,fracture zones and thick uranium ore bodies are discovered in the deep of borehole ZKH24.Many industrial urani-um ore holes are discovered in the S2 structural alteration zone.Borehole ZKH7-1 has good ore findings,confir-ming the origin place of the uranium ore.The study indicates that the comprehensive application of the three geo-physical methods has effective results in uranium ore exploration and can be promoted to uranium ore prospecting.
关键词
核桃坝地区/音频大地电磁测量/土壤氡测量/地面高精度磁测/铀矿勘查
Key words
Hetaoba area/audiomagnetotelluric survey/soil radon measurement/ground high-precision magnetic measurement/uranium exploration
维普
万方数据