Paleomagnetism of early Triassic Daye Formation and its tectonic implications

作     者：Zhongyue Shen Dajun Fang Penyang Wang Xiaodong Tan Zhaolian Wang 

作者机构：Zhejiang Univ Dept Earth Sci Hangzhou 310027 Peoples R China Daqing Petr Inst Daqing 163000 Peoples R China 

出 版 物：《Chinese Science Bulletin》 (中国科学通报)

年 卷 期：1999年第44卷第5期

页      面：412-418页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

主　　题：Yangtze Block Triassic paleomagnetism collision orogeny. 

摘      要：The new paleomagnetic data of the early Triassic Daye Formation from Hubei Province are reported. The ChRM passes consistency test and reversal test. Two magnetic components were isolated with principal component analysis （PCA）. Component B is a ChRM and component A was acquired by remagnetization during lndosinian cycle. Rock magnetic study shows that the carrier is dominantly detrital magnetite. According to the data, in conjunction with recently published Triassic paleornagnetic results, mean paleopole of the Triassic Yangtze Block is calculated as 30.3°N, 198.4°E, α95 = 9.2°.Distribution of all Triassic declinations indicates obviously local rotation in the mid-Yangtze areas,which results in consistence of the declinations with fold axes. By comparison with Triassic paleomagnetic data in the South China Block and some of geological evidence, it is inferred that the timing of the suture between the Yangtze Block and the South China Block is earlier in western part than in eastern part in the