内蒙古黄旗海不同粒级湖泊沉积物Rb、Sr组成与环境变化

doi:10.11821/xb200611010

地理学报 ›› 2006, Vol. 61 ›› Issue (11): 1208-1217.doi: 10.11821/xb200611010

内蒙古黄旗海不同粒级湖泊沉积物Rb、Sr组成与环境变化

申洪源¹, 贾玉连², 李徐生³, 吴敬禄⁴, 魏灵³, 王朋岭⁵

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

收稿日期:2006-05-18 修回日期:2006-08-08 出版日期:2006-11-25 发布日期:2006-11-25
作者简介:申洪源 (1963-), 男, 教授, 博士, 主要从事第四纪地质与环境演变研究. E-mail: shhongyuan@126.com
基金资助:
国家自然科学基金项目 (No. 40401006)

Environmental Change Inferred from Distribution of Rb and Sr in Different Grain Size Fractions from Lacustrine Sediments in Huangqihai Lake, Inner Mongolia

SHEN Hongyuan¹, JIA Yulian², LI Xusheng³, WU Jinglu⁴, WEI Ling³, WANG Pengling⁵

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

Received:2006-05-18 Revised:2006-08-08 Online:2006-11-25 Published:2006-11-25
Supported by:
National Natural Science Foundation of China, No. 40401006

摘要/Abstract

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、77 μm~20 μm和小于20 μm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20 μm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20 μm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

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, 77-20 μm and < 20 μm. 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 μm correlate positively with the magnetic susceptibility of these samples. Therefore, the ratios of Rb/Sr in the fraction < 20 μm 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.

Key words: Inner Mongolia, Huangqihai Lake, Holocene, different grain size fractions, lake sediment, ratio of Rb/Sr, climate change

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.

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.

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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

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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