| 松潘地块若尔盖盆地与西秦岭造山带岩石圈尺度的构造关系——深地震反射剖面探测成果 |
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| 关键词:Songpan Block Zoigê basin west Qinling orogen deep seismic reflection profile basin-range |
| 基金项目:国家自然科学基金重点项目(编号:40334035) |
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| 摘要: |
| Tectonic Relationships between the Zoigê Basin of the Song-Pan Block and the West Qinling Orogen at Lithosphere Scale: Results of Deep Seismic Reflection Profiling |
| The Zoigê basin and the west Qinling orogen constitute a typical basin-range structural pair on the northeastern margin of the Qinghai-Tibet plateau. The lithosphere structure and the deep structural relationship between the plateau boundary and the basin-range pair have laid the foundation for studying the collision of blocks on the northeastern margin of the Qinghai-Tibet plateau. A deep seismic reflection profile across the Zoigê basin and the west Qinling orogen about 63 km long had a recorded time length up to 30s (TWT), with the data reaching the mantle depth. The profile disclosed for the first time the structure of the whole crust and the upper mantle in the basin-range boundary zone on the northeastern margin of the Qinghai-Tibet plateau, and discovered a north-dipping strong reflection. The north-dipping reflection constitutes seismic evidence for the underthrusting of the Zoigê basin beneath the west Qinling orogen. The seismic profile preliminarily reveals the structural relationship between the Zoigê Basin and the west Qinling orogen during Tibetan extrusion at the lithosphere scale. The nearly horizontal reflection from the Moho suggests that the Zoigê basin and the west Qinling orogen underwent intensive extension during the post-orogenic period. |
| GAO Rui,WANG Hai-yan,MA Yong-sheng,ZHU Xian,ZHANG Qiu-sheng,LI Peng-wu,KAUNG Zhao-yang,LU Zhan-wu.2006.Tectonic Relationships between the Zoigê Basin of the Song-Pan Block and the West Qinling Orogen at Lithosphere Scale: Results of Deep Seismic Reflection Profiling[J].Acta Geoscientica Sinica,27(5):411-418. |
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