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Science China Earth Sciences

, Volume 57, Issue 8, pp 1929–1943 | Cite as

High-frequency polarity swings during the Gauss-Matuyama reversal from Baoji loess sediment

  • TianShui Yang
  • Masayuki Hyodo
  • ZhenYu Yang
  • ShiHong Zhang
  • Toshiaki Mishima
  • HuaiChun Wu
  • HaiYan Li
  • Yi Li
  • XingAn Shi
  • Kan Wang
  • YiMing Ma
Research Paper

Abstract

Paleomagnetic records of the Gauss-Matuyama reversal were obtained from two loess sections at Baoji on the Chinese Loess Plateau. Stepwise thermal demagnetization shows two obvious magnetization components. A low-temperature component isolated between 100 and 200–250°C is close to the present geomagnetic field direction, and a high-temperature component isolated above 200–250°C reveals clearly normal, reversed, and transitional polarities. Magnetostratigraphic results of both sections indicated that the Gauss-Matuyama reversal consists of a high-frequency polarity fluctuation zone, but the characteristic remanent magnetization directions during the reversal are clearly inconsistent. Rock magnetic experiments demonstrated that for all the specimens with normal, reversed, and transitional polarities magnetite and hematite are the main magnetic carriers. Anisotropy of magnetic susceptibility indicates that the studied loess sediments have a primary sedimentary fabric. Based on virtual geomagnetic pole latitudes, the Gauss-Matuyama reversal records in the two sections are accompanied by 14 short-lived geomagnetic episodes (15 rapid polarity swings) and 12 short-lived geomagnetic episodes (13 rapid polarity swings), respectively. Our new records, together with previous ones from lacustrine, marine, and aeolian deposits, suggest that high-frequency polarity swings coexist with the Gauss-Matuyama reversal, and that the Gauss-Matuyama reversal may have taken more than 11 kyr to complete. However, we need more detailed analyses of sections across polarity swings during reversals as well as more high-resolution reversal records to understand geomagnetic behavior and inconsistent characteristic remanent magnetization directions during polarity reversals.

Keywords

polarity reversals geomagnetic episodes Gauss-Matuyama loess 

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Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • TianShui Yang
    • 1
    • 2
  • Masayuki Hyodo
    • 3
  • ZhenYu Yang
    • 4
  • ShiHong Zhang
    • 1
    • 2
  • Toshiaki Mishima
    • 3
  • HuaiChun Wu
    • 1
  • HaiYan Li
    • 1
  • Yi Li
    • 5
  • XingAn Shi
    • 2
  • Kan Wang
    • 2
  • YiMing Ma
    • 2
  1. 1.State Key Laboratory of Biogeology and Environmental GeologyChina University of GeosciencesBeijingChina
  2. 2.School of the Earth Sciences and ResourcesChina University of GeosciencesBeijingChina
  3. 3.Research Center for Inland SeasKobe UniversityKobeJapan
  4. 4.Institute of GeomechanicsChinese Academy of Geological SciencesBeijingChina
  5. 5.Henan Institute of Nonferrous Metal ExplorationZhengzhouChina

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