Analysis of regional magnetic field and source structure in Tarim Basin

作者：Yang Wen-Cai^*; Wang Jia-Lin; Zhong Hui-Zhi; Chen Bing

来源：Acta Geophysica Sinica, 2012, 55(4): 1278-1287.

DOI：10.6038/j.issn.0001-5733.2012.04.023

• Tarim Basin
• Aeromagnetic field
• Inversion
• Euler deconvolution
• Magnetic anomaly source
• Formation processes

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 similar to 5 km, 5 similar to 10 km and 10 similar to 20 km. According to seismic investigation and other geological measurements, the magnetic sources located in depth 2 similar to 5 km were developed by both Permian basalt emplacement and later crustal movement. The magnetic sources located in depth 5 similar to 10 km were developed by Permian basalt emplacement only. The magnetic sources located in depth 10 similar to 20 km were caused by metamorphism of the crystallized basement rocks.

• 出版日期2012-4
• 单位同济大学; 中国地质科学院