Characterizing magnetic mineral assemblages of surface sediments from major Asian dust sources and implications for the Chinese loess magnetism

doi:10.1186/s40623-015-0237-8

IEECAS OpenIR > 古环境研究室

	Characterizing magnetic mineral assemblages of surface sediments from major Asian dust sources and implications for the Chinese loess magnetism
	Liu,Qingsong 1; Sun,Youbin 2; Qiang,Xiaoke2 ; Tada,Ryuji 3; Hu,Pengxiang 1; Duan,Zongqi 1; Jiang,Zhaoxia 1; Liu,Jianxing 1; Su,Kai 1
通讯作者	Liu,Qingsong(qsliu@mail.iggcas.ac.cn)
	2015-05-08
发表期刊	Earth, Planets and Space
ISSN	1880-5981
卷号	67 期号:1
摘要	AbstractEolian dust plays an important role in the Earth’s climate system. Environmental magnetism has been widely used to trace dust variations at different spatial and temporal scales. However, the magnetic properties of sediments from key dust sources have not been well determined. In this study, surface samples from potential dust sources in inner Eastern Asia were systematically investigated. Our results indicate that ferrimagnetic and antiferromagnetic minerals are both present in surface sediments and that they have broad grain size distributions. Ferrimagnetic components are dominated by partially oxidized coarse-grained (pseudo-single domain and multi-domain) lithogenic magnetite particles with minor contributions from pedogenic fine-grained (single domain and superparamagnetic) particles. Antiferromagnetic hematite can be classified into three groups in terms of diffuse reflectance spectroscopy (DRS) band positions (P560 nm, P545 nm, and P535 nm, where numbers indicate the DRS band wavelength for hematite). The first group (P560 nm) is the coarse-grained hematite of lithogenic origin and is mostly confined to western China. The P535 nm group is of pedogenic origin. The P545 nm group is an intermediate phase that is present both in surface samples from the source regions and in loess. Therefore, the P545 nm and P535nm groups are related to eolian inputs to the Chinese Loess Plateau and pedogenic processes, respectively. In addition, significant differences exist between the magnetic properties of eolian material from sources and depositional regions due to gravitational sorting. These insights provide strong constraints on interpretation of dust signals recorded by the Chinese loess and marine sediments from the North Pacific Ocean.
关键词	Eolian dust Environmental magnetism Hematite Diffuse reflectance spectroscopy Eastern Inland Asia Chinese loess
DOI	10.1186/s40623-015-0237-8
语种	英语
WOS记录号	BMC:10.1186/s40623-015-0237-8
出版者	Springer Berlin Heidelberg
引用统计
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/9308
专题	古环境研究室
通讯作者	Liu,Qingsong
作者单位	1.Institute of Geology and Geophysics, Chinese Academy of Sciences; State Key Laboratory of Lithospheric Evolution 2.Institute of Earth Environment, Chinese Academy of Sciences; State Key Laboratory of Loess and Quaternary Geology 3.University of Tokyo; Department of Earth and Planetary Science
推荐引用方式 GB/T 7714	Liu,Qingsong,Sun,Youbin,Qiang,Xiaoke,et al. Characterizing magnetic mineral assemblages of surface sediments from major Asian dust sources and implications for the Chinese loess magnetism[J]. Earth, Planets and Space,2015,67(1).
APA	Liu,Qingsong.,Sun,Youbin.,Qiang,Xiaoke.,Tada,Ryuji.,Hu,Pengxiang.,...&Su,Kai.(2015).Characterizing magnetic mineral assemblages of surface sediments from major Asian dust sources and implications for the Chinese loess magnetism.Earth, Planets and Space,67(1).
MLA	Liu,Qingsong,et al."Characterizing magnetic mineral assemblages of surface sediments from major Asian dust sources and implications for the Chinese loess magnetism".Earth, Planets and Space 67.1(2015).