Identifying the origin of the magnetic directional anomalies recorded in the Datong loess profile,northeastern Chinese loess plateau

作     者：Rixiang Zhu,~1 Qingsong Liu,~(1,2) Yongxin Pan,~1 Chenglong Deng,~1 Jimin Sun~1 1 Palaeomagnetism and Geochronology Laboratory(SKL-LE),Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 2 Department of Earth Sciences,University of California at Santa Cruz,CA 95064,USA 

会议名称：《中国科学院地质与地球物理研究所2006学术年会》

会议日期：2007年

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

关 键 词：Chinese loess geomagnetic excursions magnetic fabrics 

摘      要：To better understand the origin of short-term features of palaeomagnetic signals recorded by the Chinese loess,detailed palaeomagnetic and magnetic fabric studies were conducted on a loess profile at Datong,the northeastern margin of the loess plateau,which is characterized by both high sedimentation rate(□18 cm ka-1) and variations of sedimentary *** appears that the magnetic fabrics,specifically the inclination of the maximum magnetic susceptibility principal axis(K1-Inc),are robust means to identify the deposition *** results(□74 ka) record four palaeodirectional anomalies(referred as A-D). Among them,anomaly C with relatively normal fabrics can be correlated to the Laschamp(□40 ka) *** contrast,anomalies A,B and D accompanying with Kl-Inc anomalies,are interpreted to be caused by post-depositional *** new results improve our understanding of the origins of the natural remanent magnetization recorded by the Chinese loess.