| Paleoclimate and Environment Evolution |
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| Holocene Environmental Change Recorded by Core Magnetic Properties of Juyan Lake, Northwestern China |
| LIU Yu-hang1, XIA Dun-sheng1,2, JIN ming1, ZHANG Jun-hui1 |
1.Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, China;
2.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract The Holocene environmental change of Juyan Lake in northwestern China was studied through combination of analyzing magnetic parameters of lacustrine core from G36 drilling hole in Juyan Lake, investigating total organic carbon content and grain size and other environmental proxies, and precisely AMS14C dating. Results show that most magnetic carrier minerals appeared in coarse sediments and the main magnetic minerals are contained in coarse multi-domain magnetite particles. The change mechanism of magnetic susceptibility is complicated and there is no simple positive or negative relationship between magnetic susceptibility change and environmental arid-wet change. Analysis of environmental proxies showed that the Holocene environmental changes of Juyan Lake could be divided into four arid-wet alternating periods: arid period in 6 700~4 600 a BP, wet period in 4 600~3 100 a BP, arid period in 3 100~2 500 a BP, and the lake drying up period since 1 800 a BP. In this four periods, two significant wet events and two outstanding arid events are recorded by magnetic parameters.
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Received: 29 November 2011
Published: 10 January 2012
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2012, Vol. 32 
