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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： | 申洪源,贾玉连,李徐生,吴敬禄,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,2006,61(11):1208-1217. |
| 作者姓名： | 申洪源 贾玉连 李徐生 吴敬禄 魏灵 王朋岭 |
| 作者单位： | 1. 临沂师范学院地理与旅游系,临沂,276005 2. 江西师范大学地理与环境学院,南昌,330022 3. 南京大学地理与海洋科学学院,南京,210093 4. 中国科学院南京地理与湖泊研究所,南京,210008 5. 中国科学院青藏高原研究所,北京,100085 |
| 摘 要： | 内蒙古黄旗海湖泊沉积物剖面层次结构清晰完整。通过对该剖面全样、77μm-20μm和小于20μm三个不同粒级Rb、Sr含量和磁化率的系统测定，结果表明，湖泊沉积物中小于20μm粒级成分的Rb、Sr含量和Rb／Sr值变化阶段明显．Rb／Sr值与磁化率分布曲线十分吻合，因此，小于20μm粒级成分的Rb／Sr值与磁化率包含更加真实的古气候环境信息。Rb／Sr值反映了风化的强度，因而可以作为指示夏季风环流强度的代用指标。黄旗海湖泊沉积物的地球化学Rb、Sr元素含量和Rb／Sr值以及磁化率值波动特征具有深刻的环境演变背景．由此揭示的环境特征在一定程度上反映了全新世气候千百年尺度的波动变化,与全球气候波动有关。 |
| 关 键 词： | 内蒙古 黄旗海 全新世 不同粒级 湖泊沉积物 Rb/Sr比值 气候变化 |
| 收稿时间： | 2006-05-18 |
| 修稿时间： | 8/8/2006 12:00:00 AM |
Environmental Change Inferred from Distribution of Rb and Sr in Different Grain Size Fractions from Lacustrine Sediments in Huangqihai Lake, Inner Mongolia |
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| SHEN Hongyuan,JIA Yulian,LI Xusheng,WU Jinglu,WEI Ling,WANG Pengling.Environmental Change Inferred from Distribution of Rb and Sr in Different Grain Size Fractions from Lacustrine Sediments in Huangqihai Lake, Inner Mongolia[J].Acta Geographica Sinica,2006,61(11):1208-1217. | |
| Authors: | SHEN Hongyuan JIA Yulian LI Xusheng WU Jinglu WEI Ling WANG Pengling |
| Institution: | 1. Department of Geography and Tourism, Linyi Normal College, Linyi 276005, Shandong, China; 2. Insitute of Geography and Environment, Jiangxi Normal University, Nanchang 330027, China; 3. School of Geographic and Oceanographic Sciences of Nanjing University, Nanjing 210093, China; 4. Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China; 5. Institute of Tibetan Plateau Research, CAS, Beijing 100029, China |
| Abstract: | The Huangqihai Lake, a small enclosed lake in Inner Mongolia of China, lies at the northern boundary of Eastern Asian Summer Monsoon and in the central part of Asian Winter Monsoon. Thus, its lacustrine sediment sensitively recorded the climate change of the above two monsoon systems. Based on the geochemical elements Rb and Sr of three different grain size fractions sediment from profile H3 on the northern lacustrine bottomland 13 m above the Huangqihai Lake surface in 1986, this paper investigates the record of palaeolake stand state, sedimentary environment evolution, and winter monsoon change. First, these samples are divided into three different grain size fractions, i.e., total sediments, 77-20m and < 20 m. Second, the chemical elements, Rb and Sr of the grain size separation, are tested and analyzed systematically in this paper. Then these elements compositions of these samples are measured using VP-320 mode fluorescence spectrum instrument, respectively. The magnetic susceptibilities of these samples are measured using Kappabridge KLY-3 mode instrument made in Czech AGICO Company. The results showed the elements of Rb and Sr and the ratios of Rb/Sr vary regularly with the grain size. But the ratios of Rb/Sr in the sediments with < 20 m correlate positively with the magnetic susceptibility of these samples. Therefore, the ratios of Rb/Sr in the fraction < 20m from the lake sediments reflect the weathering intensity in the deposition sites. It is a good indicator of the summer monsoon-induced weathering and pedogentic 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 ratio of Rb/Sr climate change |
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