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


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.

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Description/Abstract

The monsoon climate changes during the Holocene, a period characterized by civilization development, has a
significant impact on the living environment of the human society, especially the alteration of drought and floods
associated with the strength of the summer monsoon. A variety of medias, including lake, delta, and marine
sediments, corals, loess, and stalagmite, have been used to reconstruct the evolution of the Holocene Asian
monsoon. Due to the broad area of Asia and the regional variations in climate and human activities, a comp lete
p icture of the Asian monsoon would be only drawn based on data integrated from extensive regional studies. The
Chaohu 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 p laeoenvironment of northern subtrop ical climate zone. However,
high2resolution records of Holocene environmental changes in this region are rare. In this study, a drill core (1615m
in length)was obtained from the p resent coastal p lain of the Chaohu Lake, Eastern China, which covers the period
of the Holocene according to AMS 14C dating. The top 800cm part of the core was used for multi2parameter rock
magnetic and bulk particle size investigations, with the purpose to retrieve high2resolution information of Asian
Monsoon evolution over the last 7000 years. The magnetic p roperties of core are dominated by magnetite grains.
Sedimentation dynamics, which is largely controlled by p recip itation, p lays a significant role in the variations of
magnetic p roperties in the lake sediments. In general, sedimentswith higher clay content are characterized by lower
concentration ofmagnetic minerals and finer grain size, which are deposited in a period of higher lake level due to
stronger rainfall and therefore stronger summermonsoon. In contrast, sediments with a higher fraction of > 32

Item Type: Article
Additional Information: Paper in Chinese with English abstract
ISSNs: 1001-7410 (print)
Keywords: environmental magnetism , sedimentation dynamics , precipitation , Asian Monsoon , Holocene , Chaohu Lake Environmental magnetism, deposition power, precipitation, the Asian monsoon, the Holocene, Chaohu; environmental magnetism, sedimentation dynamics, precipitation, Asian Monsoon, Holocene, Chaohu Lake
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
G Geography. Anthropology. Recreation > GE Environmental Sciences
G Geography. Anthropology. Recreation > GB Physical geography
Divisions: University Structure - Pre August 2011 > School of Geography > Environmental Processes and Change
ePrint ID: 55717
Date Deposited: 05 Aug 2008
Last Modified: 27 Mar 2014 18:38
URI: http://eprints.soton.ac.uk/id/eprint/55717

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