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Rock magnetic characteristics and magnetic susceptibility change mechanism of the loess since 8. 5 ka in the southern margin of Tarim Basin
Lu, S (Lu Shuang)1,2,3; Han, WX (Han WenXia)4; Zhang, T (Zhang Tao)5,6; Han, FQ (Han FengQing)1,2; Lu, SC (Lu ShengCheng)1,2,3; Ma, XH (Ma XueHai)1,2,3; Zhang, ZG (Zhang ZhiGao)7
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
2019
Volume62Issue:8Pages:3053-3066
DOI10.6038/cjg2019M0443
Abstract

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.

Subject AreaGeosciences
WOS IDWOS:000480300600022
Language英语
Indexed BySCI
KeywordChinese Loess Tianshan Mountains Paleosol Sequences Taklimakan Desert Alaskan Loess Central-asia Grain-size Climate Section Deposition
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Cooperation Status国内
ISSN0001-5733
Department大陆碰撞与高原隆升重点实验室
URL查看原文
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9207
Collection图书馆
Corresponding AuthorHan, WX (Han WenXia)
Affiliation1.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.
Recommended Citation
GB/T 7714
Lu, S ,Han, WX ,Zhang, T ,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]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2019,62(8):3053-3066.
APA Lu, S .,Han, WX .,Zhang, T .,Han, FQ .,Lu, SC .,...&Zhang, ZG .(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, S ,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.
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