Magnetic responses to acidification in Lake Yangzonghai, SW China

doi:10.1016/S1474-7065(03)00129-3

	Magnetic responses to acidification in Lake Yangzonghai, SW China
	Hu, S ; Wang, Y ; Appel, E ; Zhu, Y ; Hoffmann, V ; Shi, C ; Yu, Y
刊名	PHYSICS AND CHEMISTRY OF THE EARTH
	2003
卷号	28 期号:16-19 页码:711-717
关键词	pollution acidification lake sediments environmental magnetism Ostracoda diatom chemical elements
ISSN号	1474-7065
DOI	10.1016/S1474-7065(03)00129-3
文献子类	Article
英文摘要	A short core of 33 cm length was obtained from lacustrine sediments of Lake Yangzonghai, Yunnan Province, China. A power plant, built in 1960 is located close to the northeast corner of the take, and black burned coal ashes can be found within the uppermost 12 cm of the sediments. The age frame of the core was determined based on Cs-137 and Pb-210 analyses. Magnetic, biological and geochemical analyses were performed on the sediments and magnetic parameters were also determined from the source material of the power plant. The burned coal ash, collected directly from the power plant, is strongly magnetic, and its main magnetic content is magnetite. However, magnetic susceptibility and anhysteretic remanence of the sediment core is much lower and shows some evident fluctuations above 12 cm, corresponding to the time when the power plant was built. Ostracoda show a similar pattern, with a lower concentration at the top and a higher one below. However, some certain diatom species, which only can survive in acid water environment, show the reverse pattern. Element contents such as Al, a sensitive indicator for acidification, decrease above the 10 cm level. Based on all these data, it can be concluded that the water of the lake was acidified after the power plant was built, which caused dissolution of magnetic particles, and resulted in the decrease of magnetic concentration at the top of the core. This work demonstrates that magnetic response towards environmental pollution can be in different ways, i.e. not only by an enhancement of magnetic concentration. (C) 2003 Elsevier Ltd. All rights reserved.
WOS关键词	FOREST SOILS ; POLLUTION ; SUSCEPTIBILITY ; DEPOSITION ; MINERALS
WOS研究方向	Geology ; Meteorology & Atmospheric Sciences ; Water Resources
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000185977700008
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/79019]
专题	中国科学院地质与地球物理研究所
通讯作者	Hu, S
作者单位	1.Chinese Acad Sci, Nanjing Inst Geog & Limnol, Nanjing 210008, Peoples R China 2.Univ Tubingen, Inst Geowissensch, D-72076 Tubingen, Germany 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Hu, S,Wang, Y,Appel, E,et al. Magnetic responses to acidification in Lake Yangzonghai, SW China[J]. PHYSICS AND CHEMISTRY OF THE EARTH,2003,28(16-19):711-717.
APA	Hu, S.,Wang, Y.,Appel, E.,Zhu, Y.,Hoffmann, V.,...&Yu, Y.(2003).Magnetic responses to acidification in Lake Yangzonghai, SW China.PHYSICS AND CHEMISTRY OF THE EARTH,28(16-19),711-717.
MLA	Hu, S,et al."Magnetic responses to acidification in Lake Yangzonghai, SW China".PHYSICS AND CHEMISTRY OF THE EARTH 28.16-19(2003):711-717.