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

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

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006geoji.164..312z&link_type=abstract

Geophysical Journal International, Volume 164, Issue 8, pp. 312-318.

Astronomy and Astrophysics

Astronomy

7

Chinese Loess, Geomagnetic Excursions, Magnetic Fabrics

Scientific paper

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 cmka-1) and variations of sedimentary environments. It appears that the magnetic fabrics, specifically the inclination of the maximum magnetic susceptibility principal axis (K1-Inc), are robust means to identify the deposition environments. Our 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) excursion. In contrast, anomalies A, B and D accompanying with K1-Inc anomalies, are interpreted to be caused by post-depositional disturbances. The new results improve our understanding of the origins of the natural remanent magnetization recorded by the Chinese loess.

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