Progress and outlooks on magnetostratigraphy of Chinese loess

CHEN Tianran; XIAO Guoqiao; LIN Xinru; PAN Qing

doi:10.16562/j.cnki.0256-1492.2024013001

2024 Vol. 44, No. 2

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CHEN Tianran, XIAO Guoqiao, LIN Xinru, PAN Qing. Progress and outlooks on magnetostratigraphy of Chinese loess[J]. Marine Geology & Quaternary Geology, 2024, 44(2): 1-15. doi: 10.16562/j.cnki.0256-1492.2024013001

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CHEN Tianran, XIAO Guoqiao, LIN Xinru, PAN Qing. Progress and outlooks on magnetostratigraphy of Chinese loess[J]. Marine Geology & Quaternary Geology, 2024, 44(2): 1-15. doi: 10.16562/j.cnki.0256-1492.2024013001

Progress and outlooks on magnetostratigraphy of Chinese loess

1.
Hubei Key Laboratory of Critical Zone Evolution, School of Geography and Information Engineering, China University of Geosciences, Wuhan 430078, China
2.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430078, China
3.
Planetary Environmental and Astrobiological Research Laboratory, School of Atmospheric Sciences, Sun Yat-Sen University, Zhuhai 519000, China

More Information

Corresponding author: XIAO Guoqiao, gqxiaocug@126.com

Received Date: 30 January 2024

Revised Date: 07 March 2024

Accepted Date: 07 March 2024

Publish Date: 28 April 2024

Abstract

Abstract

The Chinese loess is one of the most important terrestrial records of the Quaternary climate changes. Magnetostratigraphy is one of the primary methods for establishing the chronological framework of the Quaternary loess. The measured positions of the Brunhes/Matuyama, Jaramillo, Olduvai, and Matuyama/Gauss polarity reversal boundaries in Chinese loess were summarized and compared against corresponding marine records. It was found that the positions of each polarity reversal boundary are inconsistent among different loess sections, and the difference spanned more than one loess-paleosol cycle. This discrepancy cannot be attributed to the lock-in effect, regional climate, sedimentation rate or different loess stratigraphic divisions. This may indicate that the polarity reversal boundaries recorded by loess deposits had probably experienced significant remagnetization, leading to a large discrepancy between loess geochronometer in magnetostratigraphy at orbital scale and marine oxygen isotope records by different researchers. In the future, studies shall focus more on the relative paleointensity (RPI) of loess to confirm the true position of each polarity reversal boundary and ultimately resolve the discrepancy in the comparison scheme between Chinese loess data and deep-sea sediment record.
- Chinese loess /
- Quaternary /
- magnetostratigraphy /
- remagnetization /
- relative paleointensity

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References

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