Paleomagnetic Constraints on the Closure Time of Paleo-Tethys: Implications for the Tectonic Setting of Formation of Triassic Songpan-Ganzi Flysch Complex
详细信息
- 责任者：Li Pengwu (Lithosphere Research Center ; Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Gao Rui
- 刊名：Acta Geoscientica Sinica
- 出版年：2009
- 卷期：30(1)
- 关键词：古地磁 ; paleomagnetism ; 特提斯 ; Tethys ; 西南地区 ; Southwest China
- 页码：p.39-50
- 图表：4 illus., 1 table, 72 refs.
- 分类号：0300
- issnNo：ISSN1006-3021
- isbnNo：CN11-3474/P
摘要
A comparative analysis of paleolatitudes and latitudinal displacements was undertaken for the South China Block, Tarim Block and Cimmerian Continent. The results show that 1) the 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; 2) the 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; and 3) the indentation of northern Paleo-Tethys oceanic bank between western South China Block and southern East Kunlun-Qaidam Block might 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.