• 责任者：Xu Wei (Xi’an Center of Geological Survey ; CGS ; Xi’an 710054 ; China) ; Sun Zhiming
• 刊名：Geological Bulletin of China
• 出版年：2013
• 卷期：32(10)
• 关键词：早二叠世 ; Lower Permian ; 古地磁 ; paleomagnetism ; 塔里木盆地 ; Tarim Basin
• 页码：p.1566-1574
• 图表：6 illus., 2 tables, 49 refs.
• 分类号：0400
• issnNo：ISSN1671-2552
• isbnNo：CN11-4648/P

     libri" size="3">Paleomagnetic determinations of the Early Permian basalt rocks in the Gudong Mountain area of Tarim block libri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">（libri" size="3">38.74N/ 79.7Elibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">）libri" size="3"> are presented in this paper. Stepwise thermal demagnetization successfully revealed stable characteristic residual magnetization libri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">（libri" size="3">ChRMlibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">）libri" size="3">. Generally, reversal polarities were observed in all sampled sites in the studied section. The tilt-corrected mean directions of the Early Permian are D/I=217.7/-37.5 with oL95 being 13.6 and N being 9, corresponding to a paleopole at 53.2N, 187.5E, Ags=12.3. Compared with the Early Permian poles from the northwestern margin of the Tarim block, the authors hold that in- significant tectonic movement may have occurred between the interior of Tarim and its northwestern margin within paleomagnetic uncertainties. Based on the Early Permian paleopole from the Kazakhstan block and paleontological information, the authors consid- ered that the two blocks may have collided and experienced collage in the early Cretaceous. The sea between the Tarim block and the Kazakhstan block had not vanished until the Late Permian. In association with previous studies, the authors carried out EarlyPermian paleogeographic reconstruction which included Chinalibri; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 宋体; mso-fareast-theme-font: minor-fareast; mso-hansi-font-family: calibri; mso-hansi-theme-font: minor-latin">＇libri" size="3">s major blocks.