A STUDY ON PARTIAL ANHYSTERETIC REMANENCE IN SEDIMENTS FROM GANHAI LAKE, NINGWU TIANCHI

ZHANG Shuwei; LIU Qingsong; WANG Xisheng; Cioppa Maria; HUO Junjie; LV Yiqing; QIAO Yansong; ZHAO Yue

2017 Vol. 23, No. 4

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ZHANG Shuwei, LIU Qingsong, WANG Xisheng, Cioppa Maria, HUO Junjie, LV Yiqing, QIAO Yansong, ZHAO Yue. A STUDY ON PARTIAL ANHYSTERETIC REMANENCE IN SEDIMENTS FROM GANHAI LAKE, NINGWU TIANCHI[J]. Journal of Geomechanics, 2017, 23(4): 612-616.

Citation:

A STUDY ON PARTIAL ANHYSTERETIC REMANENCE IN SEDIMENTS FROM GANHAI LAKE, NINGWU TIANCHI

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
3.
Department of Ocean Science and Engineering, South University of Science and Technology, Shenzhen 518055, Guangdong, China
4.
Department of Earth and Environmental Sciences, University of Windsor, Windsor, ON N9B 3P4, Canada

Received Date: 06 February 2017

Publish Date: 25 August 2017

Abstract

Abstract

A study of partial anhysteretic remanent magnetization (pARM) spectra in samples from a sediment profile of Ganhai Lake (38°53'N, 112°11'E) shows variations in effective magnetic grain sizes of the lake sediment magnetite particles, consistent with the hysteresis results. Within the full profile, most magnetite particles are of coarse, multi-domain (MD) size, as shown by the dominant low coercivity (AF < 20 mT) spectra, with a few samples showing finer single domain (SD)-pseudo-single domain (PSD) particles with higher coercivity (AF>20 mT). The uppermost level (~7.3~4.0 ka) contains more coarse MD magnetite grains due to higher pARM peaks than the middle (~12.0~7.3 ka) and the lowermost level (~13.0~12.0 ka) that shows lower peaks. The middle level shows slight more fine SD-PSD magnetite grains than both the uppermost and lowermost level. High-field pARM spectrum can effectively identify fine PSD-SD magnetite grains and reduce effects of MD grains. Therefore, pARM spectrum analysis can be utilized to quickly and effectively determine the relative amount of fine magnetic grains in the samples, which is helpful to the study of the paleo-climate, rock magnetism and paleomagnetism of the lake sediments.
- pARM /
- magnetic grains /
- lake sediments /
- Ningwu /
- rock magnetism

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References

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