地质通报2016，Vol.35Issue(6)：971-978,8.
龙门山构造带早三叠世古地磁新结果及其对四川盆地构造旋转的制约
New paleomagnetic result of Early Triassic rocks from the Longmenshan belt and its tectonic implications
摘要
Abstract
This paper reports new Early Triassic paleomagnetic results from Jiange County (32.2° N, 105.3° E) in the Longmenshan belt. Based on the stepwise thermal demagnetization of limestone and argillaceous limestone specimens from 9 sampling sites, the au⁃thors revealed a characteristic remanent magnetism (ChRM). Both normal and reversal polarities were observed in the study section, and the high temperature components pass reversal tests at the 95%confidence level. This indicates that the ChRM may represent the primary remanent magnetism of the Early Triassic limestone. The tilt-corrected mean direction for the Early Triassic is Ds/Is=42.3°/12.6° withα95=9.4° and N=9 sites, corresponding to a paleopole at 42.9°N, 219.3°E, dp/dm=4.9°/9.6°. A comparison with the Early Triassic poles from the Sichuan basin shows that insignificant post-Early Triassic motion may have occurred between the Longmen⁃ shan belt and the Sichuan basin. It is thus considered that the Sichuan basin has not experienced whole-scale vertical axis rotation since the Early Triassic.关键词
龙门山构造带/早三叠世/古地磁学/四川盆地/构造旋转Key words
Longmenshan belt/Early Triassic/paleomagnetism/Sichuan basin/tectonic rotation分类
天文与地球科学引用本文复制引用
叶小舟,孙知明,李海兵,曹勇,张蕾,王雷振,赵越..龙门山构造带早三叠世古地磁新结果及其对四川盆地构造旋转的制约[J].地质通报,2016,35(6):971-978,8.基金项目
国家自然科学基金项目（批准号41330211）和中国地质调查局项目 （）
