| 二维初至波层析成像揭示的兰坪盆地—扬子西缘浅层地壳结构 |
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| 关键词:Lanping Basin western margin of the Yangtze block seismic tomography shallow crustal velocity structure |
| 基金项目:国家重点研发计划(编号: 2016YFC0600302)；国家自然科学基金项目(编号: 42374119; 42261144669; 42274134; C2330)；中国地质科学院基本科研业务费项目(编号: S2304; JKYQN202311) |
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| 摘要: |
| Shallow Crustal Velocity Structure of the Lanping Basin–Western Margin of the Yangtze Block Revealed by 2D First-arrival Seismic Tomography |
| The Lanping Basin–western margin of the Yangtze block, located in the southeastern margin of the Tibetan Plateau, geotectonically belongs to the eastern part of the Tibetan-Himalayan collision orogenic belt. It spans two major tectonic units (the South China block and the Gondwana). The shallow crust is an important carrier for recording crustal deformation, magmatism and mineralization.. In this study, we obtain the shallow P-wave velocity structure of the upper crust by using the first-arrivals (Pg phase) from a 220-km-long deep-reflection seismic profile. The result shows that the sedimentary thickness of the Lanping Basin gradually decreases from west to east, and the eastern part of the western margin of the Yangtze block exhibits characteristics of “thick on both sides and thin in the middle”. Several thrust faults were developed in the Lanping Basin. The Jinshajiang and Chenghai faults are steep in the shallow upper crust. Formation of the Jinding Pb-Zn deposit may be associated with the deep thermal. The crystalline basement beneath the Beiya Au deposit bulges upward, which is speculated to be caused by the upwelling magma. |
| WANG Guan,XIONG Xiaosong,LU Zhanwu,LI Qiusheng,WU Guowei,ZHANG Xinyan.2024.Shallow Crustal Velocity Structure of the Lanping Basin–Western Margin of the Yangtze Block Revealed by 2D First-arrival Seismic Tomography[J].Acta Geoscientica Sinica,45(6):989-1001. |
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