Pedogenesis affecting the Matuyama-Brunhes polarity transition recorded in Chinese loess?

P5; A detailed record of the Matuyama-Brunhes (M-B) transition has been obtained from the loess unit 8 (L8) at Duanjiapo (34.2°N, 109.2°E)，Shannxi Province of China. An investigation of the rock magnetic properties using hyste-resis loops, thermomagnetic analyses identifies pseudo- single domain mag...

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Bibliographic Details
Published in:Chinese science bulletin 2001-06, Vol.46 (12), p.975-980
Main Authors: Guo, Bin, Zhu, Rixiang, Fabio, Florindo, Pan, Yongxin, Yue, Leping
Format: Article
Language:English
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Summary:P5; A detailed record of the Matuyama-Brunhes (M-B) transition has been obtained from the loess unit 8 (L8) at Duanjiapo (34.2°N, 109.2°E)，Shannxi Province of China. An investigation of the rock magnetic properties using hyste-resis loops, thermomagnetic analyses identifies pseudo- single domain magnetite as the main carrier of the remanence, with a small contribution from maghemite and hematite. The paleo-direction records obtained reveal: (ⅰ) The M-B transition was recorded in the middle and lower part of L8, and comprises of five fast reversals. (ⅱ) The duration of the M-B polarity transition related to the directional change is about 4800 a. (ⅲ) The virtual geomagnetic pole (VGP) path during the transition is confined over Africa, peaked 90° away from the sampling site, in contrast with the results obtained from the Weinan loess section. The different VGPs are probably attributed to the pedogenesis.
ISSN:1001-6538
1861-9541
DOI:10.1007/BF03183539