The EnvironmentalMagnetic Records of Honghu Lake Evolution in Past 1200 Years

CHEN Ping; HE Bao-yin; DU Yun; Kunihiko ENDO; YANG Han-dong

Based on the environmental magnetic measurement on the core with the length of 140cm collected from Honghu Lake, it has been analyzed the chart that the environmental magnetic parameters vary alone with the depth.The result suggests that the stable single domain and fine viscous ferromagnetic minerals dominate the characteristics of sediments. The magnetic minerals grain size increasingly reduces from the bottom to top. By combination AMS dating and geochemistry analyses, it can be deduced that Honghu Lake experiences swampy and lacustrine sediment from last 1200a. Moreovermagnetic characteristics changing corresponds to palaeoclimatic changes. In cold and dry condition,the magnetic parameters are higher than that in warm and wet condition. They record the course that Honghu Lake extends and shrinks along with climate; at one time reflects the human activities' impact on the lake.

1. Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077;

2. Southwest of China Normal University the School of Resource and Enviroment Sciences, Chongqing 400715;

3. Nihon University, Tokyo, Japan;

4.

Received Date: 2004-04-19

Rev Recd Date: 2004-09-03

Publish Date: 2005-03-10

Key words:

Abstract: Based on the environmental magnetic measurement on the core with the length of 140cm collected from Honghu Lake, it has been analyzed the chart that the environmental magnetic parameters vary alone with the depth.The result suggests that the stable single domain and fine viscous ferromagnetic minerals dominate the characteristics of sediments. The magnetic minerals grain size increasingly reduces from the bottom to top. By combination AMS dating and geochemistry analyses, it can be deduced that Honghu Lake experiences swampy and lacustrine sediment from last 1200a. Moreovermagnetic characteristics changing corresponds to palaeoclimatic changes. In cold and dry condition,the magnetic parameters are higher than that in warm and wet condition. They record the course that Honghu Lake extends and shrinks along with climate; at one time reflects the human activities' impact on the lake.

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The EnvironmentalMagnetic Records of Honghu Lake Evolution in Past 1200 Years

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