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学科主题: Multidisciplinary Sciences
题名: Magnetic granulometry of recent sediments from the Huguang Maar and its implication for provenience
作者: Han, YL ; Tan, XD ; Chen, Z ; Xiang, R ; Zhang, LL
通讯作者: xdtan@scsio.ac.cn
关键词: Huguang Maar ; grain size ; rock magnetism ; Asian winter monsoon
刊名: CHINESE SCIENCE BULLETIN
发表日期: 2010
卷: 55, 期:40638, 页:418-424
收录类别: sci
部门归属: [Han YuLin; Tan XiaoDong; Chen Zhong; Xiang Rong; Zhang LanLan] Chinese Acad Sci, Key Lab Marginal Sea Geol, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Han YuLin] Chinese Acad Sci, Coll Earth Sci, Grad Univ, Beijing 100049, Peoples R China
项目归属: 海洋地质
摘要: To understand the origin and its climatic implications of the Huguang Maar sediments, we conducted laser grain size analysis and rock mangtic measurement for the recent deposits from the Huguang Maar and for the volcanic rocks of the caldera for comparison. The grain size distributions are dominated by clayey silts for both the bulk sediments and magnetic separates. Acquisition of isothermal remanent magnetization (IRM) and thermal demagnetization of IRM suggest (titano) magnetite as the dominating magnetic mineral in the sediments; high coercivity minerals are not detected. Therefore, the ratio of the susceptibility of anhysteretic remanent magnetization (k (ARM)) to the weak field magnetic susceptibility (k), k (ARM)/k can be used to estimate the grain size of magnetite. The sediments and volcanic rocks yield values of 13.7 and 11.8 for the k (ARM)/(k), respectively, corresponding to grain size values of similar to 0.03 A mu m and similar to 0.05 A mu m. The magnetic granulometry of lake sediments is distinctive from one of the Chinese loess, in which published data suggest a value of 6.0 for k (ARM)/(k), and grain size of similar to 0.1 A mu m, but is akin to the nearby volcanic rocks. Although a Loess Plateau source of the lake sediments cannot be fully ruled out, the catchment is most probably the main source. We explain the slightly finer magnetite grain size in sediments than in the volcanic rocks as being disintegrated of particles during erosion and transportation. We conclude that there is no evidence for aeolian input of the Loess Plateau dusts into the Huguang Maar, and the relationship between magnetic parameters of the lake sediments and winter monsoon intensity is probably more complicated than previously thought.
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WOS记录号: WOS:000274843600015
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4344
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Han, YL; Tan, XD; Chen, Z; Xiang, R; Zhang, LL.Magnetic granulometry of recent sediments from the Huguang Maar and its implication for provenience,CHINESE SCIENCE BULLETIN,2010,55(40638):418-424
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