Magnetic Susceptibility of Hani Peat Sediments in Northeast China and Its Paleoclimate Significance

doi:10.19657/j.geoscience.1000-8527.2021.161

Abstract

Abstract:

The Hani peat bog is located in the western Changbaishan of Jilin province, Northeast China. The peat records paleoclimate and paleoenvironment change. The record is benefited from the continuous deposition, high deposition rate, and low anthropological influence. In this study, AMS ¹⁴C dating was used to determine the age of peat samples, and the magnetic susceptibility was measured to determine its paleoclimatic significance and reconstruct the paleoclimatic evolution since 14 ka B.P.. The results show that magnetic susceptibility of Hani peat is low overall, which indicates that the concentration of magnetic mineral particles in Hani peat is low during most of the Holocene.The magnetic susceptibility of Hani peat records the change of ambient temperature and humidity. Higher magnetic susceptibility indicates warm and humid climate, whereas lower magnetic susceptibility indicates dry and cold climate. The magnetic susceptibility responds strongly to many dry-cold climatic events during the Holocene, including the 0.4-0.6 ka B.P.event ( Little Ice Age), and the events at 2.8 ka B.P., 4.3 ka B.P. and 8.2 ka B.P. Thus, magnetic susceptibility of the Hani peat not only records the climate change since the Holocene, but also responds well to the global climate change.

Key words: Hani peat, magnetic susceptibility, AMS ¹⁴C dating, Holocene, paleoclimate change

CLC Number:

P532
P534.63

WANG Xianglian, HUANG Ting, XIAO He, WU Daishe, ZHANG Xiaolong, CHENG Shenggao, MAO Xumei. Magnetic Susceptibility of Hani Peat Sediments in Northeast China and Its Paleoclimate Significance[J]. Geoscience, 2021, 35(05): 1323-1331.

Figures/Tables 6

Fig.1 Location of the Hani peat bog and sampling site (a), and remote sensing image of Hani peatland (b) (red marks showing the sampling site location)

Fig.2 Integrated lithostratigraphic column of the Hani peat

Table 1 AMS 14C dating results of the Hani peat profile[29]

样品编号	测年深度/cm	AMS ¹⁴C年龄/a B.P.	校正年龄/a B.P.
HA1	80	807±40	722
HA2	135	1 380±88	1 292
HA3	200	2 455±46	2 673
HA4	350	4 674±53	5 383
HA5	495	7 354±63	8 171
HA6	570	7 658±64	8 412
HA7	600	8 352±76	9 337
HA8	625	9 604±80	10 745
HA9	740	10 102±80	11 643
HA10	745	10 399±89	12 336
HA11	780	10 446±91	12 356
HA12	820	11 122±90	13 135
HA13	900	11 930±172	13 937

Fig.3 Temporal series curve of volume magnetic susceptibility(a), low-frequency mass susceptibility(b), and frequency susceptibility(c) of the Hani peat

Table 2 Correlation analysis between parameters

参数	质量磁化率	频率磁化率	腐殖化度	F1	F3
质量磁化率	1
频率磁化率	-0.360^**	1
腐殖化度	0.221^**	0.098	1
F1	0.902^**	-0.488^**	0.1	1
F3	0.862^**	-0.531^**	0.051	0.991^**	1

Fig.4 Temporal series comparison of peat magnetic susceptibility (a), humification (b) [23], δ18O temperature (c) [29], δ13C humidity (d) [2] in Hani and the North Atlantic stained hematite (e)[39,40] ( gray fields denoting the IRD cold events in the North Atlantic)

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