The northern margin of Ordos Basin is an important base for sandstone-type uranium deposit in China.In recent years,geological exploration has found that the Telaaobao area has great prospecting potential.How to locate the redox transition zone is the key to delineate favorable metallogenic areas.Most of the previous magnetic studies on sandstone-type uranium deposits only directly analyze the magnetic anomalies on the deposits,and rarely study the difference of magnetic susceptibility in different environments,nor concern the influence of deep basement.In this paper,the magnetic susceptibility parameters of different sandstones in the study area are counted,the forward response of the theoretical model was calculated,and the magnetic measurement was carried out to obtain the magnetic anomaly characteristics and the residual magnetic anomaly.The results have found some relationship between the location of the redox transition zone and the ratio of ferric iron to ferrous iron.It was considered that the redox transition zone in the study area was characterized by weak high anomaly,which is different from the traditional interlayer oxidation zone type magnetic anomaly.The reason was believed that the oil and gas reduction in the later period changed the valence state of local iron elements and caused the local magnetic anomaly to rise.
关键词
磁异常/正演计算/砂岩型铀矿/氧化还原过渡带/特拉敖包矿产地
Key words
magnetic anomaly/forward calculation/sandstone-type uranium deposit/the redox transition zone/Telaaobao Occurrence
维普
万方数据