气候变化领域集成服务门户(CCPortal): Rock magnetism in loess from the middle Tian Shan: Implications for paleoenvironmental interpretations of magnetic properties of loess deposits in Central Asia

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DOI	10.1029/2012GC004251
	Rock magnetism in loess from the middle Tian Shan: Implications for paleoenvironmental interpretations of magnetic properties of loess deposits in Central Asia
	Zan, Jinbo; Fang, Xiaomin; Nie, Junsheng; Teng, Xiaohua; Yang, Shengli
通讯作者	Zan, JB (通讯作者)
发表日期	2012
ISSN	1525-2027
卷号	13
英文摘要	Considerable attention has recently been paid to the magnetic properties of loess deposits in Central Asia. However, paleoenvironmental interpretations of magnetic properties of loess deposits in South Tajikistan, the Ili Basin, and the Tarim Basin remain controversial. Current meteorological observations demonstrate that the mean annual precipitation in the Junggar Basin exceeds that in the Tarim Basin and falls below that in the Ili Basin and South Tajikistan. This study of rock magnetism in loess from the Junggar Basin improves our understanding of the complicated relationships between magnetic properties, climate, and source materials for loess deposits of Central Asia. This study involved multiparameter investigations of rock magnetism in a 71 m loess section in the Dongwan area, on the northern slope of the middle Tian Shan (in the Junggar Basin). Variations in concentration of coarse eolian ferrimagnetic minerals appear to provide the main control over the magnetic properties of loess in this area. The contribution of ultrafine pedogenically produced magnetic grains to the magnetic susceptibility (chi) is minimal. Furthermore, long-term increasing trends in the chi and the saturation isothermal remanent magnetization (SIRM) were found in the Dongwan loess section. These trends may be linked with intensified aridification of Central Asia in the mid-Pleistocene. This study suggests that reduced precipitation of westerly moisture from Tajikistan into the Tarim Basin might play a critical role in the paleoenvironmental interpretations of magnetic properties in the loess deposits of Central Asia.
关键词	CHINESE LOESS PALEOCLIMATIC SIGNIFICANCE PALEOSOL SEQUENCES PACIFIC-OCEAN NORTH PACIFIC SUSCEPTIBILITY RECORD OXIDATION SEDIMENTS REGIONS
英文关键词	Central Asia; Tian Shan loess; aridification; magnetoclimatology; rock magnetism
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000310690700003
来源期刊	GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
来源机构	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/258046
推荐引用方式 GB/T 7714	Zan, Jinbo,Fang, Xiaomin,Nie, Junsheng,et al. Rock magnetism in loess from the middle Tian Shan: Implications for paleoenvironmental interpretations of magnetic properties of loess deposits in Central Asia[J]. 中国科学院青藏高原研究所,2012,13.
APA	Zan, Jinbo,Fang, Xiaomin,Nie, Junsheng,Teng, Xiaohua,&Yang, Shengli.(2012).Rock magnetism in loess from the middle Tian Shan: Implications for paleoenvironmental interpretations of magnetic properties of loess deposits in Central Asia.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,13.
MLA	Zan, Jinbo,et al."Rock magnetism in loess from the middle Tian Shan: Implications for paleoenvironmental interpretations of magnetic properties of loess deposits in Central Asia".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 13(2012).