气候变化领域集成服务门户(CCPortal): 新疆伊犁地区典型黄土磁学特征及其环境意义初探

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	新疆伊犁地区典型黄土磁学特征及其环境意义初探
其他题名	MAGNETIC CHARACTERISTICS OF LOESS IN THE ILI AREA AND THEIR ENVIRONMENTAL IMPLICATION
	夏敦胜; 陈发虎; 马剑英; 金明; 王训明; 贾佳; 魏海涛; 刘现彬
发表日期	2010
ISSN	1001-7410
卷号	30 期号:5 页码:902-910
中文摘要	黄土地层记录的磁学参数受控因素复杂,全球不同地区黄土磁化率的主要受控因子存在差别.文章在伊犁地区选取两个地层磁化率与成壤作用分别存在较明显正相关和负相关的典型黄土剖面,进行了系统磁性地层学研究.结果表明伊犁地区黄土地层中磁性矿物浓度较大,磁学性质主要受呈现准单畴状态磁铁矿控制,黄土沉积物中磁性矿物主要为原生矿物,后期改造作用弱,地层的磁学特征受物源影响明显.地层的成壤强度与地层中磁性矿物浓度无明显相关关系,与磁性矿物中细粒磁性矿物的含量呈正相关关系.本研究结果暗示伊犁地区黄土沉积物的磁化率增强模式既区别于典型的西伯利亚黄土"风速说"模型,也不同于中国黄土高原"成壤说"模型; 当后期改造作用弱时,地层的磁学特征主要受物源影响; 随着地层成壤作用的增强,对原生磁性矿物的改造作用逐渐增强,次生磁性矿物含量逐渐增加,磁化率变化规律趋近于"成壤说"模型
英文摘要	There are positive correlations, negative correlations, or no correlation between magnetic susceptibility and pedogenic degree of loess in different sites around the world. This indicates that the magnetic property of loess is complicated and controlled by different mechanisms at different areas. In this study, two loess sections in the Ili area were selected and studied by using multi-environmental magnetic parameters(such as Xlf Xlfd%, XARM,SIRM, HIRM,SOFT.) and grain size. One is section Kansu(KS), where the magnetic susceptibility is higher in paleosols and lower in loess. The other one is section Axike (AXK), where part of paleosol has lower values of magnetic susceptibility and part of loess has higher values of magnetic susceptibility. The results show that (1)the concentration of magnetic minerals in loess of the Ili area is higher than that in loess of China's Loess Plateau and the magnetic properties are controlled mainly by pseudo-single domain (PSD) magnetite; (2) magnetic minerals in loess are mainly primary minerals and their post-depositional alternation is weak, suggesting that the magnetic characteristics of loess were clearly affected by source materials ; and (3) there is no significant correlation between the concentration of magnetic minerals and the pedogenic intensity, but the concentration of fine-grained magnetic minerals is positively correlated with the pedogenic degree
关键词	黄土成壤作用环境磁学磁化率伊犁
英文关键词	loess;pedogenesis;environmental magnetism;magnetic susceptibility;Ili Basin
语种	中文
WOS研究方向	Geology
WOS类目	GEOLOGY
CSCD记录号	CSCD:3985053
来源期刊	第四纪研究
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/1648
推荐引用方式 GB/T 7714	夏敦胜,陈发虎,马剑英,等. 新疆伊犁地区典型黄土磁学特征及其环境意义初探[J]. 兰州大学, 中国科学院青藏高原研究所,2010,30(5):902-910.
APA	夏敦胜.,陈发虎.,马剑英.,金明.,王训明.,...&刘现彬.(2010).新疆伊犁地区典型黄土磁学特征及其环境意义初探.第四纪研究,30(5),902-910.
MLA	夏敦胜,et al."新疆伊犁地区典型黄土磁学特征及其环境意义初探".第四纪研究 30.5(2010):902-910.