干旱区生态环境知识资源中心(Arid): 中亚地区现代表土磁学特征及其古环境意义

Arid

	中亚地区现代表土磁学特征及其古环境意义
其他题名	MAGNETIC CHARACTERISTICS OF SURFACE SOIL IN ARID REGION OF CENTRAL ASIA AND THEIR PALEOENVIRONMENTAL SIGNIFICANCE
	夏敦胜 1; 魏海涛 2; 马剑英 1; 王训明 1; 张家武 2; 赵晖 1
ISSN	1001-7410
出版年	2006
卷号	26 期号:6 页码:937-946
中文摘要	在中国西北地区主要沙漠、绿洲和戈壁及蒙古国南部戈壁等亚洲中部粉尘源区采集了表土(包括沙漠和土壤)样品,系统分析了样品的磁学性质(包括磁化率、无磁滞磁化率、等温剩磁、磁滞回线和热磁曲线).结果表明,中亚地区表土样品中主要磁性矿物是铁磁矿,含有赤铁矿和磁赤铁矿,并伴有少量顺磁性矿物;磁性矿物粒度主要是准单畴(PSD)和多畴(MD),超顺磁性颗粒含量较低,接近于中国西部黄土地层含量.中亚地区表土磁性矿物含量总体都较低,磁性矿物含量在空间上与降雨量成正比.研究结果指示西部地区(准噶尔盆地和南部塔里木盆地)表土样品较北部地区(鄂尔多斯高原、阿拉善高原以及蒙古高原)表土样品,其粗颗粒磁性矿物含量高,而细颗粒磁性矿物含量低.本研究结果为黄土地层古土壤磁性增强源自成土过程提供了最直接的证据.
英文摘要	In this study, magnetic techniques were used to characterize surface soils from different geomorphology (i. e. sand desert, oasis, Gobi, and dry lake) in Northwest China and Mongolia. Results demonstrate that the main magnetic minerals in surface soil are magnetite, maghaemite and haematite with some paramagnetic material. Cross plots of Mrs/Ms vs. Bcr/Bc and X _(fd)% vs. x_(ARM)/SIRM indicate that the main magnetic grain sizes in surface soil are pseudo single domain (PSD) and multidomain (MD). No significant difference has been found in some magnetic parameters including X_(If), SIRM, SOFT and SIRM/X_(lf), from surface soils from sites from the West area (i. e. Tarim Basin and Junggar Basin) and the North area (i. e. Alxa Plateau, Erdos Plateau and Monlia Plateau). However, other magnetic parameters, i. e. X_(fd)%. X_(ARM), X_(ARM)/SIRM, X_(ARM)/X_(lf) and HIRM generally have lower values in the West. Samples from the West are dominated by magnetic minerals with lager grain size while those from the North are dominated by fine magnetic minerals. The similarity in magnetic mineral constitutions between Chinese loess and surface soils from Central Asia implies that the loess might originate from a vast arid to semi-arid region in Central Asia. The low value of concentration-dependent magnetic parameters indicates that the low concentration of magnetic minerals in surface soils from Central Asia and the magnetic enhancement from pedogenic take place in both the loess and the paleosols, although the progress is stronger in the later.
中文关键词	环境磁学 ; 表土 ; 黄土 ; 沙漠 ; 戈壁 ; 中亚地区
英文关键词	environment magnetism surface soil loess desert Gobi Central Asia
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:2636490
来源机构	中国科学院西北生态环境资源研究院 ; 兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/219600
作者单位	1.中国科学院寒区旱区环境与工程研究所, 中科院沙漠与沙漠化重点实验室, 兰州, 甘肃 730000, 中国; 2.兰州大学资源环境学院中德干旱环境联合研究中心, 西部环境教育部重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	夏敦胜,魏海涛,马剑英,等. 中亚地区现代表土磁学特征及其古环境意义[J]. 中国科学院西北生态环境资源研究院, 兰州大学,2006,26(6):937-946.
APA	夏敦胜,魏海涛,马剑英,王训明,张家武,&赵晖.(2006).中亚地区现代表土磁学特征及其古环境意义.,26(6),937-946.
MLA	夏敦胜,et al."中亚地区现代表土磁学特征及其古环境意义".26.6(2006):937-946.