| 古特提斯洋的闭合时代的古地磁分析:松潘复理石杂岩形成的构造背景 |
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| 关键词:Paleomagnetism Paleo-Tethys Songpan-Ganzi Block |
| 基金项目:自然科学基金项目“内蒙古中部古亚洲洋最终闭合时代的古地磁研究”(编号：40774026)、中国地质大学(北京)地下信息探测技术与仪器教育部重点实验室开放课题项目(编号：GDL0503) |
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| Paleomagnetic Constraints on the Closure Time of Paleo-Tethys: Implications for the Tectonic Setting of Formation of Triassic Songpan-Ganzi Flysch Complex |
| A comparative analysis of paleolatitudes and latitudinal displacements was undertaken for the South China Block, Tarim Block and Cimmerian Continent (including Baoshan, Shan-Thai and Qiangtang blocks) by using available paleomagnetic data to determine the closure age of Paleo-Tethys. The results show that ①the Baoshan Block collided with the South China Block in Late Permian, and then continued to drift rapidly northwards together with the South China Block until Late Triassic, resulting in the collision of the South China Block with the North China Block and the formation of the Qinling-Dabie orogenic belt; ②the Qiangtang Block collided with the Tarim Block in Late Triassic. The closure of Paleo-Tethys along the eastern edge of the Baoshan Block and the northern edge of the Qiangtang Block might have been diachronous, becoming younger and younger westward; ③the indentation of northern Paleo-Tethys oceanic bank between western South China Block and southern East Kunlun-Qaidam Block mignt have resulted from the northward drift of the South China Block and the rifting of the continental margin of western South China Block, which was caused by the subduction of the oceanic crust and probably Provided the space for the development of Songpan-Ganzi submarine fan. The enclosure of several blocks, including Tarim, East Kunlun-Qaidam, South China and Qiangtang blocks, results in the triangular tectonic shape of Songpan-Ganzi Block, and supports the hypothesis that the source of Songpan-Ganzi flysch complex is attributed to a large flux of sediments from the Qinling-Dabie orogenic belt. |
| LI Peng-wu,GAO Rui,GUAN Ye,LI Qiu-sheng.2009.Paleomagnetic Constraints on the Closure Time of Paleo-Tethys: Implications for the Tectonic Setting of Formation of Triassic Songpan-Ganzi Flysch Complex[J].Acta Geoscientica Sinica,30(1):39-50. |
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