干旱区生态环境知识资源中心(Arid): 新疆伊犁晚全新世风成沙一古土壤序列磁化率特征及气候变化

Arid

	新疆伊犁晚全新世风成沙一古土壤序列磁化率特征及气候变化
其他题名	Late Holocene Climate Change Revealed by the Magnetic Susceptibility of Paleoaeolian Sand-Paleosol Sedimentary Sequence in Yili Valley of Xinjiang
	凌智永 1; 李志忠 2; 武胜利 3; 靳建辉 2; 闫映宇 4
来源期刊	沉积学报
ISSN	1000-0550
出版年	2012
卷号	30 期号:5 页码:928-936
中文摘要	选择新疆伊犁河谷塔克尔莫乎尔沙漠古风成沙一古土壤沉积剖面为研究对象,通过73块样品的磁化率及其与TOC/CaCO_3/Fe_2O_3和粒度组成的相关分析,并以OSL测年为时间标尺,讨论剖面沉积的磁化率变化机制及其古气候意义。结果表明:剖面低频磁化率(X_(lf))与16 ~ 250 mum百分含量为正相关,即低频磁化率X_(lf)变化主要受粗组分含量变化的影响。其中,古风成沙X_(lf)值多高于古土壤,这与我国季风区沙漠沉积的磁化率变化特征相反。根据剖面磁化率及各种环境指标综合分析,研究区3.7 kaBP以来的气候变化可划分为5个阶段:3.71 ~ 3.06 kaBP凉湿、3.06 ~ 2.78 kaBP冷干、2.78~2.10 kaBP凉湿、2.10~0.50 kaBP冷湿、0.50 -0.00 kaBP温干。晚全新世气候变化与周边地区古气候记录有较好的一致性,并与同期北大西洋表层海温变化事件呈现很好的遥相关,总体上表现为相对暖干、凉湿的典型西风气候变化模式。
英文摘要	By studying on correlation between magnetic susceptibility,TOC,CaCO_3,Fe_2O_3 and grainsize component of 73 samples from the paleosand-paleosol sedimentary section of Xinjiang Takermohuer desert, according to OSL date, we discussed mechanism of magnetic susceptibility change and paleoclimate significance. The results were that : The correlation between X_(lf)and percent content of 16~250 mum component was positive, coarse component percent content affected the change of X_(lf). In the section, X_(lf) of paleosand is higher than X_(lf) of paleosol, this characteristic is opposite to magnetic susceptibility of monsoon desert sediment in China. According to magnetic susceptibility and other paleoclimate indexes of section sediment,we divided 5 paleoclimate stages of study area from 3.71 ka BP:3.71 ~ 3.06 kaBP, the climate was cool and wet,from 3.06 kaBP to 2.78 kaBP was cold and dry,2.78 ~ 2.10 kaBP was cool wet,2.10 ~ 0.50 kaBP was cold and wet,0.50 kaBP to now was warm and dry. Climate change of research area is simliar to the other regiones during late holocene, and it was related to the temperature change events of surface sea-water in north Alantic Ocean. The climate change was typical westerly climate model, warm-dry or cool-wet.
中文关键词	风成沙一古土壤 ; 磁化率 ; 晚全新世 ; 气候变化 ; 新疆伊犁
英文关键词	paleosand-paleosol magnetic susceptibility late holocene climatic change Yili of Xinjiang
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOLOGY
WOS研究方向	Geology
CSCD记录号	CSCD:4686827
来源机构	中国科学院西北生态环境资源研究院 ; 新疆师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/227810
作者单位	1.中国科学院青海盐湖研究所, 西宁, 青海 810008, 中国; 2.福建师范大学地理科学学院, 福州, 福建 350007, 中国; 3.新疆师范大学地理科学与旅游学院, 乌鲁木齐, 新疆 830054, 中国; 4.新疆水土保持与生态环境监测总站, 乌鲁木齐, 新疆 830000, 中国
推荐引用方式 GB/T 7714	凌智永,李志忠,武胜利,等. 新疆伊犁晚全新世风成沙一古土壤序列磁化率特征及气候变化[J]. 中国科学院西北生态环境资源研究院, 新疆师范大学,2012,30(5):928-936.
APA	凌智永,李志忠,武胜利,靳建辉,&闫映宇.(2012).新疆伊犁晚全新世风成沙一古土壤序列磁化率特征及气候变化.沉积学报,30(5),928-936.
MLA	凌智永,et al."新疆伊犁晚全新世风成沙一古土壤序列磁化率特征及气候变化".沉积学报 30.5(2012):928-936.