| 鄂尔多斯盆地北部重磁场及其基底断裂特征研究 |
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| 关键词:cratonization and reactivation structural framework basement fault basement gravity and magnetic anomaly fields northern Ordos Basin |
| 基金项目:国家自然科学基金项目(编号: 41172127; 41572102);陕西省煤田地质集团科技管理部项目(编号: SMDZ-2022ZD-5; SMDZ-2023ZD-09) |
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| Study on Gravity and Magnetic Fields and Characteristics of Basement Faults in the Northern Ordos Basin |
| To elucidate the characteristics of basement faults in the northern Ordos Basin, an analysis of its gravity and magnetic field characteristics was conducted. Wavelet multiscale decomposition and power spectrum analysis methods were used to comprehensively identify and interpret the obtained basement gravity and magnetic anomaly fields. The results reveal that the Bouguer Gravity anomaly field in the northern Ordos Basin exhibited higher values in the east and lower values in the west. Simultaneously, the aeromagnetic field was organized into zones of nearly east–west (EW) positive and negative. A total of 28 intra-basin basement faults were identified in the northern Ordos Basin, with north–east (NE) and EW trending basement faults being predominant, and NW and SN trending faults distributed in a staggered or oblique tectonic framework; The EW–NE basement fault originated from the continental collision event between the ~1.95 Ga Yinshan Block and the Ordos Block. The Xinzhao North–Porjianghaizi South (F4+F10) basement fault zone serves as a boundary of different tectonic units before the Mesoproterozoic. Moreover, The SN–NW trending faults are a tearing structure formed during the continental collision process, selectively activated in the EW-trending tensile stress field in the Mesoproterozoic. The formation of the basement fault system in the northern Ordos Basin is attributed to the interaction between different continents and is selectively activated in later stages. This evidence of structural deformation contributes valuable insights into the study of the North China cratonization and reactivation process. |
| Tian Gang,Wen Xiaogang,Xue Haijun,MA Li,PU Renhai,Song Lijun,Chen Jie,Chen Shuo,WU Dalin,Yang Minghui.2024.Study on Gravity and Magnetic Fields and Characteristics of Basement Faults in the Northern Ordos Basin[J].Acta Geoscientica Sinica,45(3):279-290. |
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