干旱区生态环境知识资源中心(Arid): Rock magnetic characteristics and magnetic susceptibility change mechanism of the loess since 8. 5 ka in the southern margin of Tarim Basin

Arid

DOI	10.6038/cjg2019M0443
	Rock magnetic characteristics and magnetic susceptibility change mechanism of the loess since 8. 5 ka in the southern margin of Tarim Basin
	Lu Shuang 1,2,3; Han WenXia 4; Zhang Tao 5,6; Han FengQing 1,2; Lu ShengCheng 1,2,3; Ma XueHai 1,2,3; Zhang ZhiGao 7
通讯作者	Han WenXia
来源期刊	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN	0001-5733
出版年	2019
卷号	62 期号:8 页码:3053-3066
英文摘要	Magnetic susceptibility, as a convenient and reproducible rock magnetic index, has been widely used in paleoclimatic reconstruction and has achieved great success in China Loess Plateau. The mechanism that pedogenesis intensity contributes to the magnetic susceptibility is generally accepted in China Loess Plateau. However, the magnetic susceptibility change mechanism in Xinjiang is still unclear, so that the paleoclimatic significance of magnetic susceptibility remains controversial. In this study, a typical loess section (Yangchang section) with accurate chronology from the southern margin of Tarim Basin was selected for rock magnetism and high resolution magnetic susceptibility study. Combined with the grain size characteristics, mineral components and elemental concentrations, the magnetic susceptibility change mechanism was discussed. The results show that the main magnetic-bearing mineral is coarse-grained magnetite with a small amount of hard magnetic minerals and paramagnetic minerals in the Yangchang loess sediments. According to the variation characteristics of magnetic-bearing minerals and magnetic susceptibility, the section can be further divided into two stages: Phase I (8.5 similar to 2.5 ka), the content of soft magnetic minerals are relatively high, and the magnetic susceptibility stays in relatively high value. Phase II (2.5 similar to 0.2 ka), hard magnetic minerals and paramagnetic minerals, represented by pyrite, increase, while the magnetic susceptibility decreases significantly. Correlation analysis and cross wavelet analysis results show that the change of magnetic susceptibility is consistent with that of coarse particles in phase I, suggesting a so-called wind velocity theory model control of magnetic susceptibility in this stage. While in phase II, besides the positive correlation between magnetic susceptibility and the contents of coarse grain, a strong negative correlation between the magnetic susceptibility and pedogenic proxy was also observed, indicating a combined effects of wind velocity theory and reductive pedogenesis processes on magnetic susceptibility change during phase II. This study provides valuable information on rock magnetic characteristics and magnetic susceptibility change in this area, and gives a new clue on further paleoclimatic reconstruction in Xinjiang and Central Asia based on magnetic susceptibility.
英文关键词	The southern margin of Tarim Basin Loess Rock magnetism Magnetic susceptibility change mechanism Cross wavelet analysis
类型	Article
语种	中文
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000480300600022
WOS关键词	CHINESE LOESS ; TIANSHAN MOUNTAINS ; PALEOSOL SEQUENCES ; TAKLIMAKAN DESERT ; ALASKAN LOESS ; CENTRAL-ASIA ; GRAIN-SIZE ; CLIMATE ; SECTION ; DEPOSITION
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
来源机构	中国科学院青藏高原研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214888
作者单位	1.Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Comprehens & Highly Efficient Utilizat Sa, Xining 810008, Qinghai, Peoples R China; 2.Qinghai Prov Key Lab Geol & Environm Salt Lakes, Xining 810008, Qinghai, Peoples R China; 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China; 4.Linyi Univ, Sch Resources & Environm Sci, Shandong Prov Key Lab Water & Soil Conservat & En, Linyi 276005, Shandong, Peoples R China; 5.Chinese Acad Sci, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China; 6.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China; 7.Anyang Normal Univ, Sch Resource Environm & Tourism, Anyang 455000, Henan, Peoples R China
推荐引用方式 GB/T 7714	Lu Shuang,Han WenXia,Zhang Tao,et al. Rock magnetic characteristics and magnetic susceptibility change mechanism of the loess since 8. 5 ka in the southern margin of Tarim Basin[J]. 中国科学院青藏高原研究所,2019,62(8):3053-3066.
APA	Lu Shuang.,Han WenXia.,Zhang Tao.,Han FengQing.,Lu ShengCheng.,...&Zhang ZhiGao.(2019).Rock magnetic characteristics and magnetic susceptibility change mechanism of the loess since 8. 5 ka in the southern margin of Tarim Basin.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,62(8),3053-3066.
MLA	Lu Shuang,et al."Rock magnetic characteristics and magnetic susceptibility change mechanism of the loess since 8. 5 ka in the southern margin of Tarim Basin".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 62.8(2019):3053-3066.