Discussion on Magnetic Anomaly Characteristics and Generation Mechanism of Redox Transition Zone in Telaaobao Occurrence
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.
magnetic anomalyforward calculationsandstone-type uranium depositthe redox transition zoneTelaaobao Occurrence
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