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| 内蒙古黄旗海不同粒级湖泊沉积物Rb、Sr组成与环境变化 | |
| 引用本文： | 陈磊,申洪源,贾玉连,吴敬禄,李徐生,魏灵,王朋岭.内蒙古黄旗海不同粒级湖泊沉积物Rb、Sr组成与环境变化[J].地理学报(英文版),2008,18(3):373-384. |
| 作者姓名： | 陈磊 申洪源 贾玉连 吴敬禄 李徐生 魏灵 王朋岭 |
| 作者单位： | 陈磊,申洪源,CHEN Lei,SHEN Hongyuan(Environment and Tourism College, Linyi Normal University, Linyi 276005, Shandong, China);贾玉连,JIA Yulian(School of Geography and Environment, Jiangxi Normal University, Nanchang 330027, China);吴敬禄,WU dinglu(Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China);李徐生,魏灵,LI Xusheng,WEI Ling(School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093, China);王朋岭,WANG Pengling(Institute of Tibetan Plateau Research, CAS, Beijing 100029, China) |
| 摘 要： | Based on the geochemical elements Rb and Sr in sediments with three different grain size fractions from profile H3 on the northern lacustrine bottomland 13 m above the Huangqihai Lake surface in 1986,the paper investigates the record of palaeolake stand state, sedimentary environmental evolution,and winter monsoon change.First,these samples are separated into three different grain size fractions,i.e.,total sediments,77-20μm and〈20μm. Second,the chemical elements-Rb and Sr-of the grain size separation were tested and analyzed systematically in this paper.Then the elements compositions of these samples are measured using VP-320 mode fluorescence spectrum instrument,respectively.The magnetic susceptibility of these samples is measured using Kappabridge KLY-3 mode instrument made in Czech AGICO Company.The results showed the elements and the ratios varied regularly with the grain size.But the ratio of Rb/Sr in the sediments〈20μm correlates positively with the magnetic susceptibility of these samples.Therefore,the ratio of Rb/Sr in the fraction〈20 μm from the lake sediments reflected the strengthening of the weathering in the deposition sites.It is a good indicator of the summer monsoon-induced weathering and pedogenesis fluctuations and can be used to reconstruct the conditions of the paleoclimate and paleoenvironment. |
| 关 键 词： | 内蒙古 黄旗海 粒级 湖泊沉积物 环境变化 |
Environmental change inferred from Rb and Sr of lacustrine sediments in Huangqihai Lake,Inner Mongolia |
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| Lei?Chen,Hongyuan?Shen,Yulian?Jia,Jinglu?Wu,Xusheng?Li,Ling?Wei,Pengling?Wang.Environmental change inferred from Rb and Sr of lacustrine sediments in Huangqihai Lake,Inner Mongolia[J].Journal of Geographical Sciences,2008,18(3):373-384. | |
| Authors: | Lei Chen Hongyuan Shen Yulian Jia Jinglu Wu Xusheng Li Ling Wei Pengling Wang |
| Institution: | 1. Environment and Tourism College, Linyi Normal University, Linyi 276005, Shandong, China 2. School of Geography and Environment, Jiangxi Normal University, Nanchang 330027, China 3. Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China 4. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093, China 5. Institute of Tibetan Plateau Research, CAS, Beijing 100029, China |
| Abstract: | Based on the geochemical elements Rb and Sr in sediments with three different grain size fractions from profile H3 on the northern lacustrine bottomland 13 m above the Huangqihai Lake surface in 1986, the paper investigates the record of palaeolake stand state, sedimentary environmental evolution, and winter monsoon change. First, these samples are separated into three different grain size fractions, i.e., total sediments, 77-20 μm and <20 μm. Second, the chemical elements--Rb and Sr--of the grain size separation were tested and analyzed systematically in this paper. Then the elements compositions of these samples are measured using VP-320 mode fluorescence spectrum instrument, respectively. The magnetic susceptibility of these samples is measured using Kappabridge KLY-3 mode instrument made in Czech AGICO Company. The results showed the elements and the ratios varied regularly with the grain size. But the ratio of Rb/Sr in the sediments <20 μm correlates positively with the magnetic susceptibility of these samples. Therefore, the ratio of Rb/Sr in the fraction <20 μm from the lake sediments reflected the strengthening of the weathering in the deposition sites. It is a good indicator of the summer monsoon-induced weathering and pedogenesis fluctuations and can be used to reconstruct the conditions of the paleoclimate and paleoenvironment. |
| Keywords: | Inner Mongolia Huangqihai Lake Holocene different grain size fractions lake sediment Rb/Sr ratio climatic change |
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