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

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Title: High-frequency polarity swings during the Gauss-Matuyama reversal from Baoji loess sediment.
Authors: Yang, TianShui yangtsh@cugb.edu.cn, Hyodo, Masayuki1, Yang, ZhenYu2, Zhang, ShiHong, Mishima, Toshiaki1, Wu, HuaiChun3, Li, HaiYan3, Li, Yi4, Shi, XingAn5, Wang, Kan5, Ma, YiMing5
Source: SCIENCE CHINA Earth Sciences. Aug2014, Vol. 57 Issue 8, p1929-1943. 15p.
Subjects: Polarity, Loess, Magnetic properties of rocks, Remanence, Geomagnetism, Magnetic anisotropy
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. [ABSTRACT FROM AUTHOR]
Copyright of SCIENCE CHINA Earth Sciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: High-frequency polarity swings during the Gauss-Matuyama reversal from Baoji loess sediment.
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  Data: <searchLink fieldCode="AR" term="%22Yang%2C+TianShui%22">Yang, TianShui</searchLink><i> yangtsh@cugb.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Hyodo%2C+Masayuki%22">Hyodo, Masayuki</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Yang%2C+ZhenYu%22">Yang, ZhenYu</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Zhang%2C+ShiHong%22">Zhang, ShiHong</searchLink><br /><searchLink fieldCode="AR" term="%22Mishima%2C+Toshiaki%22">Mishima, Toshiaki</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wu%2C+HuaiChun%22">Wu, HuaiChun</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Li%2C+HaiYan%22">Li, HaiYan</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Li%2C+Yi%22">Li, Yi</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Shi%2C+XingAn%22">Shi, XingAn</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+Kan%22">Wang, Kan</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Ma%2C+YiMing%22">Ma, YiMing</searchLink><relatesTo>5</relatesTo>
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  Data: <searchLink fieldCode="DE" term="%22Polarity%22">Polarity</searchLink><br /><searchLink fieldCode="DE" term="%22Loess%22">Loess</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+properties+of+rocks%22">Magnetic properties of rocks</searchLink><br /><searchLink fieldCode="DE" term="%22Remanence%22">Remanence</searchLink><br /><searchLink fieldCode="DE" term="%22Geomagnetism%22">Geomagnetism</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+anisotropy%22">Magnetic anisotropy</searchLink>
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  Data: 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. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of SCIENCE CHINA Earth Sciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        StartPage: 1929
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        Type: general
      – SubjectFull: Loess
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      – SubjectFull: Magnetic properties of rocks
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