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.
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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