武汉天兴洲近代沉积物的磁性特征及其环境意义

李永涛; 顾延生; 曲赞

doi:10.3799/dqkx.2011.080

Volume 36 Issue 4

Jul. 2011

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Article Navigation > Earth Science > 2011 > 36(4): 779-788

LI Yong-tao, GU Yan-sheng, QU Zan, 2011. Magnetic Properties of Recent Sediments at Tianxing Centralshoal of Wuhan: Implication for Sedimentary Environment Change in the Middle Reaches of the Yangtze River. Earth Science, 36(4): 779-788. doi: 10.3799/dqkx.2011.080

Citation:

LI Yong-tao, GU Yan-sheng, QU Zan, 2011. Magnetic Properties of Recent Sediments at Tianxing Centralshoal of Wuhan: Implication for Sedimentary Environment Change in the Middle Reaches of the Yangtze River. Earth Science, 36(4): 779-788. doi: 10.3799/dqkx.2011.080

Citation:

LI Yong-tao, GU Yan-sheng, QU Zan, 2011. Magnetic Properties of Recent Sediments at Tianxing Centralshoal of Wuhan: Implication for Sedimentary Environment Change in the Middle Reaches of the Yangtze River. Earth Science, 36(4): 779-788. doi: 10.3799/dqkx.2011.080

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Magnetic Properties of Recent Sediments at Tianxing Centralshoal of Wuhan: Implication for Sedimentary Environment Change in the Middle Reaches of the Yangtze River

doi: 10.3799/dqkx.2011.080

1.
Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
2.
Key Laboratory of Geobiology and Environmental Geology (China University of Geosciences), Ministry of Education, Wuhan 430074, China
3.
Hubei Key Laboratory of Wetland Evolution & Ecological Restoration, China University of Geosciences, Wuhan 430074, China

Received Date: 2010-10-25
Publish Date: 2011-07-01

Abstract

Abstract

Multi-proxy of environmental magnetism (such as mass susceptibility, frequency dependent susceptibility, saturation isothermal, demagnetizing factor and thermalmagnetic curve) and magnetic fabric parameters derived from the recent sediments at Tianxing Centralshoal of Wuhan are employed to reconstruct the history of paleo-hydrology and climate changes in the mid-upper reaches of the Yangtze River. The assemblage zones of multi-proxy of environmental magnetism indicate that both upper (0.60-1.50 m) and lower (2.40-3.30 m) zones are dominated by the ferromagnetic magnetite. The upper zone is marked by the superparamagnetic grains, which make greater contributions to the mass susceptibility. The percentage of antiferromagnetic minerals in the middle zone (1.50-2.40 m) increases in inverse proportion to the percentage of the ferromagnetic. Therefore, the depth variation of the magnetic mineral contents is like letter C reflecting the magnetic characteristics of "SOFT", "hard" and "SOFT" throughout the section. The analysis on the magnetic fabric parameters demonstrates that hydrodynamic intensity of sedimentary environment, ordering degrees of particle arrangement, and flow velocity of the Yangtze River have undergone significant changes in the past 100 years, which is related to the paleo-hydrological change of the Yangtze River. Variation patterns of magnetic properties in the recent sediments are consistent with the climate change and discharge change at Hankou Station. Especially, hydrodynamic intensity of sedimentary environment has changed from unstable to stable, then unstable, corresponding to the temperature and precipitation changes from hot-wet to cool-dry and hot-wet. Our research has provided significant evidence for further understanding the influence of climate change on the paleo-hydrology and sedimentary environment of the Yangtze River in the historical period.
- sediments,
- environmental magnetism,
- magnetic fabric parameters,
- geophysics

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References(41)

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Magnetic Properties of Recent Sediments at Tianxing Centralshoal of Wuhan: Implication for Sedimentary Environment Change in the Middle Reaches of the Yangtze River

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