Magnetic mineral dissolution recorded in a lacustrine sequence from the Heqing Basin, SW China, and its relationship with changes in the Indian monsoon

doi:10.1016/j.jseaes.2019.104081

IEECAS OpenIR > 古环境研究室

	Magnetic mineral dissolution recorded in a lacustrine sequence from the Heqing Basin, SW China, and its relationship with changes in the Indian monsoon
	Xu, Xinwen 1,2; Qiang, Xiaoke2 ; Zhao, Hui 2; Fu, Chaofeng 3
通讯作者	Qiang, Xiaoke(qiangxk@loess.llqg.ac.cn)
	2020-02-01
发表期刊	JOURNAL OF ASIAN EARTH SCIENCES
ISSN	1367-9120
卷号	188 页码:9
摘要	The dissolution of magnetic oxides is an important process in many lake environments. Understanding this phenomenon is crucial for the paleoenvironmental interpretation of the magnetic properties of lake sediments. In order to reveal its effects on sedimentary magnetic properties, and to assess the possible associated paleoenvironmental implications, we carried out detailed rock magnetic analyses of the selected samples from a 920-kyr lacustrine sequence from the Heqing Basin, SW China. The results indicate that the sedimentary magnetic properties are controlled by the concentration and grain size of magnetite and maghemite. High magnetic susceptibility (chi) intervals contain more fine-grained magnetite and maghemite, while low chi intervals contain only minor amounts of residual magnetite. The decreased content of fine-grained maghemite from high chi to low chi intervals reflects the dissolution of magnetic oxides during deposition. Intervals affected by strong magnetic dissolution have a high TOC content and correspond to times of high Antarctic temperatures, suggesting that magnetic mineral dissolution intensity was associated with variations in the strength of the Indian Summer Monsoon (ISM). Notably, the ISM is sensitive to Southern Hemisphere warming. Weak magnetic dissolution indicates a dry climate occurred since similar to 320 kyr in the Heqing Basin. This dry/cool event was widespread across the Eastern Bay of Bengal, Equatorial Indian Ocean and Northern Australia, and was linked to a strengthened Indian Ocean Dipole (IOD). Since the moisture source of the Heqing Basin was mainly from the above regions, we infer that the influence of the IOD extended northwards to SW China.
关键词	Lacustrine sediments The Heqing basin Rock magnetism Magnetic mineral dissolution Indian Summer Monsoon Indian Ocean Dipole
DOI	10.1016/j.jseaes.2019.104081
关键词[WOS]	CLIMATE VARIABILITY ; SUMMER-MONSOON ; LOESS PLATEAU ; LAKE BAIKAL ; MARINE-SEDIMENTS ; ARABIAN SEA ; IRON-OXIDES ; SUSCEPTIBILITY ; GREIGITE ; OXIDATION
收录类别	SCI ; SCI
语种	英语
资助项目	National Science Fund of China[41402151] ; National Science Fund of China[41572164] ; National Science Fund of China[41272208] ; National Science Fund of China[41977379] ; National Natural Science Foundation of China[91855211] ; Open Fund of the State Key Laboratory of Loess and Quaternary Geology[SKLLQG1218] ; Shaanxi provincial education department special research project[14JK1738]
WOS研究方向	Geology
项目资助者	National Science Fund of China ; National Natural Science Foundation of China ; Open Fund of the State Key Laboratory of Loess and Quaternary Geology ; Shaanxi provincial education department special research project
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000509615200010
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：6[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/12789
专题	古环境研究室
通讯作者	Qiang, Xiaoke
作者单位	1.Northwest Univ, Shaanxi Key Lab Earth Surface Syst & Environm Car, Xian 710127, Peoples R China 2.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China 3.Changan Univ, Key Lab Western Mineral Resources & Geol Engn, Minist Educ China, Xian 710054, Peoples R China
推荐引用方式 GB/T 7714	Xu, Xinwen,Qiang, Xiaoke,Zhao, Hui,et al. Magnetic mineral dissolution recorded in a lacustrine sequence from the Heqing Basin, SW China, and its relationship with changes in the Indian monsoon[J]. JOURNAL OF ASIAN EARTH SCIENCES,2020,188:9.
APA	Xu, Xinwen,Qiang, Xiaoke,Zhao, Hui,&Fu, Chaofeng.(2020).Magnetic mineral dissolution recorded in a lacustrine sequence from the Heqing Basin, SW China, and its relationship with changes in the Indian monsoon.JOURNAL OF ASIAN EARTH SCIENCES,188,9.
MLA	Xu, Xinwen,et al."Magnetic mineral dissolution recorded in a lacustrine sequence from the Heqing Basin, SW China, and its relationship with changes in the Indian monsoon".JOURNAL OF ASIAN EARTH SCIENCES 188(2020):9.