New Late Permian Paleomagnetic Results from Qaidam Block and Tectonic Implications
详细信息
- 责任者：Xu Wei (Paleomagnetic Laboratory ; Institute of Geomechanics ; CAGS ; Beijing 100081 ; China) ; Sun Zhiming
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(11)
- 关键词：古地磁 ; paleomagnetism ; 构造演化 ; structural evolution ; 青藏高原 ; Qinghai-Tibetan Plateau ; 柴达木盆地 ; Qaidam Basin ; 阿尔金断裂带 ; Altun Fracture Zone
- 页码：p.3479-3486
- 图表：4 illus., 2 tables, 35 refs.
- 分类号：1600
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
In this paper, the authors present paleomagentic results on the Late Permian rocks in the Qaidam block near localities of Zuhema (37.49°N/99.07°E). A total 13 sites have been sampled from Late Permian sediments. Stepwise thermal demagnetizating has revealed a characteristic remanent magnetization (ChRM). Both normal and reversal polarities were observed in studied section, and the high-temperature components pass reversal tests at the 95% confidence level. This indicates the possibly primary magnetization. The tilt-corrected mean directions for the Late Permian is D/I=333.9°/41.7° with a95=6.2° and N=9 sites, corresponding to a paleopole at 64.0°N, 345.4°E, dp/dm=4.7/7.6.