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Magnetic properties of sediments from the Chaohu lake for the last 7000 years and their implications for the evolution of Asian Monsoon

Magnetic properties of sediments from the Chaohu lake for the last 7000 years and their implications for the evolution of Asian Monsoon
Magnetic properties of sediments from the Chaohu lake for the last 7000 years and their implications for the evolution of Asian Monsoon
The monsoon climate changes during the Holocene, a period characterized by civilization development, has asignificant impact on the living environment of the human society, especially the alteration of drought and floodsassociated with the strength of the summer monsoon. A variety of medias, including lake, delta, and marinesediments, corals, loess, and stalagmite, have been used to reconstruct the evolution of the Holocene Asianmonsoon. Due to the broad area of Asia and the regional variations in climate and human activities, a comp letep icture of the Asian monsoon would be only drawn based on data integrated from extensive regional studies. TheChaohu Lake is a large shallow fresh water lake in the lower reach of the Yangtze River. Its evolution history contains information as to the paleoclimate and plaeoenvironment of northern subtropical climate zone. However, high-resolution records of Holocene environmental changes in this region are rare. In this study, a drill core (1615min length) was obtained from the present coastal plain of the Chaohu Lake, Eastern China, which covers the periodof the Holocene according to AMS 14C dating. The top 800cm part of the core was used for multi-parameter rockmagnetic and bulk particle size investigations, with the purpose to retrieve high-resolution information of Asian Monsoon evolution over the last 7000 years. The magnetic properties of core are dominated by magnetite grains. Sedimentation dynamics, which is largely controlled by precipitation, plays a significant role in the variations of magnetic properties in the lake sediments. In general, sediments with higher clay content are characterized by lower concentration of magnetic minerals and finer grain size, which are deposited in a period of higher lake level due to stronger rainfall and therefore stronger summer monsoon. In contrast, sediments with a higher fraction of > 32
environmental magnetism, sedimentation dynamics, precipitation, Asian Monsoon, Holocene, Chaohu Lake Environmental magnetism, deposition power, the Asian monsoon, the Holocene, Chaohu, Chaohu Lake
1001-7410
1053-1062
Zhang, W.
1c80d4f2-4ba8-41f6-85a6-a76a4d65dc9b
Dai, X.
ffb23173-1db3-47b4-a3c2-1771e913b0fb
Zhang, F.
396ca776-f0e6-4750-974a-6ba3f9c78a41
Shi, Y.
88a0ad57-a5da-4dd1-93c8-a2833fdd6efb
Yu, L.
26837fa4-602b-4366-b6e4-0b48297474c7
Dearing, J.A.
dff37300-b8a6-4406-ad84-89aa01de03d7
Zhang, W.
1c80d4f2-4ba8-41f6-85a6-a76a4d65dc9b
Dai, X.
ffb23173-1db3-47b4-a3c2-1771e913b0fb
Zhang, F.
396ca776-f0e6-4750-974a-6ba3f9c78a41
Shi, Y.
88a0ad57-a5da-4dd1-93c8-a2833fdd6efb
Yu, L.
26837fa4-602b-4366-b6e4-0b48297474c7
Dearing, J.A.
dff37300-b8a6-4406-ad84-89aa01de03d7

Zhang, W., Dai, X., Zhang, F., Shi, Y., Yu, L. and Dearing, J.A. (2007) Magnetic properties of sediments from the Chaohu lake for the last 7000 years and their implications for the evolution of Asian Monsoon. Quaternary Sciences, 6 (27), 1053-1062.

Record type: Article

Abstract

The monsoon climate changes during the Holocene, a period characterized by civilization development, has asignificant impact on the living environment of the human society, especially the alteration of drought and floodsassociated with the strength of the summer monsoon. A variety of medias, including lake, delta, and marinesediments, corals, loess, and stalagmite, have been used to reconstruct the evolution of the Holocene Asianmonsoon. Due to the broad area of Asia and the regional variations in climate and human activities, a comp letep icture of the Asian monsoon would be only drawn based on data integrated from extensive regional studies. TheChaohu Lake is a large shallow fresh water lake in the lower reach of the Yangtze River. Its evolution history contains information as to the paleoclimate and plaeoenvironment of northern subtropical climate zone. However, high-resolution records of Holocene environmental changes in this region are rare. In this study, a drill core (1615min length) was obtained from the present coastal plain of the Chaohu Lake, Eastern China, which covers the periodof the Holocene according to AMS 14C dating. The top 800cm part of the core was used for multi-parameter rockmagnetic and bulk particle size investigations, with the purpose to retrieve high-resolution information of Asian Monsoon evolution over the last 7000 years. The magnetic properties of core are dominated by magnetite grains. Sedimentation dynamics, which is largely controlled by precipitation, plays a significant role in the variations of magnetic properties in the lake sediments. In general, sediments with higher clay content are characterized by lower concentration of magnetic minerals and finer grain size, which are deposited in a period of higher lake level due to stronger rainfall and therefore stronger summer monsoon. In contrast, sediments with a higher fraction of > 32

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More information

Published date: 2007
Additional Information: Paper in Chinese with English abstract
Keywords: environmental magnetism, sedimentation dynamics, precipitation, Asian Monsoon, Holocene, Chaohu Lake Environmental magnetism, deposition power, the Asian monsoon, the Holocene, Chaohu, Chaohu Lake

Identifiers

Local EPrints ID: 55717
URI: http://eprints.soton.ac.uk/id/eprint/55717
ISSN: 1001-7410
PURE UUID: 7a6ac313-fe28-4a51-875e-5fca283099b5
ORCID for J.A. Dearing: ORCID iD orcid.org/0000-0002-1466-9640

Catalogue record

Date deposited: 05 Aug 2008
Last modified: 12 Dec 2021 03:26

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Contributors

Author: W. Zhang
Author: X. Dai
Author: F. Zhang
Author: Y. Shi
Author: L. Yu
Author: J.A. Dearing ORCID iD

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