Analysis of Regional Magnetic Field and Source Structure in Tarim Basin

详细信息   

• 责任者：Yang Wencai (State Lab. of Continental Tectonics and Dynamics ; Institute of Geology ; CAGS ; Beijing 100037 ; China) ; Wang Jialin
• 刊名：Chinese Journal of Geophysics
• 出版年：2012
• 卷期：55(4)
• 关键词：磁场 ; magnetic field ; 航磁异常 ; aeromagnetic anomaly ; 塔里木盆地 ; Tarim Basin
• 页码：p.1278-1287
• 图表：4 illus., 1 table, 25 refs.
• 分类号：0400,1600
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

摘要

This paper deals with interpretation of regional aeromagnetic field of Tarim Basin.Interpretation of regional magnetic field becomes difficult due to stacking of many anomalies coming from different sources and the non-uniqueness in geophysical inversion.The Euler deconvolution method is applied to automatic calculation of depths of the magnetic sources.Based on the order that the newer strata are located shallower in a sedimentary basin,we calculate first the depths of the anomalies,then locate their source distribution according to the source depth,resulting in correlation between the sources and its geological formation processes.In this way,the obtained results may provide more correct evidences for interpretation of the regional magnetic field.In the studied area,we divide the source-depth into 3 groups as 2～5 km、5～10 km and 10～20 km.According to seismic investigation and other geological measurements,the magnetic sources located in depth 2～5 km were developed by both Permian basalt emplacement and later crustal movement.The magnetic sources located in depth 5～10 km were developed by Permian basalt emplacement only.The magnetic sources located in depth 10～20 km were caused by metamorphism of the crystallized basement rocks.