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	新疆博斯腾湖沉积物粒度的古环境意义初探
其他题名	Primary study on the environmental significances of grain-size changes of the Lake Bosten sediments
	黄小忠; 陈发虎; 肖舜; 吕雁斌; 陈建微; 周爱锋
发表日期	2008
ISSN	1003-5427
卷号	20 期号:3 页码:291-297
中文摘要	湖泊沉积物的粒度分析是一种研究古环境变化常用的手段,但是其环境意义具有多解性,尤其是沙(荒)漠干旱区的湖泊沉积物粒度变化,代表的是沙尘天气的多寡强弱还是其它环境因素的变化值得细致研究.在对我国最大的内陆淡水湖--新疆博斯腾湖的沉积物短岩芯进行了~(210)Pbex,~(137)Cs定年的基础上.对近50多年沉积物的粒度进行分析,结果表明平均粒径与粗颗粒含量与区域最大河流--开都河大山口站的最大一天洪量、洪峰流量.天山巴音布鲁克站年降水量、湖泊水位变化以及湖泊附近焉耆站3-6月风力强度变化记录等环境因素对比发现,湖泊中部沉积物中粗颗粒含量变化主要反映的是入湖河流径流量、区域洪水强度及频率、山地降水,而并不反映大风天气或者湖泊水位的变化.对其近千年沉积岩芯的多指标分析结果表明,即使在数百年时间尺度上,博斯腾湖沉积物粒度的环境意义依然与十年时间尺度上一致.
英文摘要	Grain size analysis is a conventional method to explore paleo-environmental changes, but its environment significance has various explanations. Especially for the lake sediments preserved in dry-land area close to Gobi and desert, it is still unclear if the grain size represents the intensity and frequency of the dust weather or the other environmental indicators. Based on the ~(137)Cs and ~(210)Pbex activities from a short-length Glew core drilling from the center of Lake Bosten, the largest inland freshwater lake in China, grain size analysis of the past 50 years of lake sediments suggests that the average grain size and coarse grains content coincide with the maximum one-day runoff and the flood peak runoff at Dashakou station of Kaidu River, and with the annual precipitation of Bayinbuluke Station in the Tianshan Mts. However, the peaks of grain size curves were not consistent with lake level variations or wind speed changes （from March to June） of the Yanqi Station near to Lake Bosten. Therefore, the coarse grains content and average grain size can generally represent intensity and frequency of flood events of the Kaidu River and strong precipitation in the surrounding Tianshan mountainous area, but do not indicate lake level variations nor wind speed changes. A millennial multi-proxy record of Lake Bosten also suggests that the environmental significance from grain size at centennial or multi-centennial timescales is the same as that at annual to decadal timescales.
关键词	博斯腾湖粒度古环境洪水事件开都河
英文关键词	Lake Bosten;grain size analysis;paleo-environment;flood event;Kaidu River
语种	中文
WOS研究方向	Geology
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
CSCD记录号	CSCD:3242433
来源期刊	湖泊科学
来源机构	兰州大学 ; 中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/1677
推荐引用方式 GB/T 7714	黄小忠,陈发虎,肖舜,等. 新疆博斯腾湖沉积物粒度的古环境意义初探[J]. 兰州大学, 中国科学院青藏高原研究所,2008,20(3):291-297.
APA	黄小忠,陈发虎,肖舜,吕雁斌,陈建微,&周爱锋.(2008).新疆博斯腾湖沉积物粒度的古环境意义初探.湖泊科学,20(3),291-297.
MLA	黄小忠,et al."新疆博斯腾湖沉积物粒度的古环境意义初探".湖泊科学 20.3(2008):291-297.