Determination of the optimized late Pleistocene chronology of a lacustrine sedimentary core from the Heqing Basin by geomagnetic paleointensity and its paleoclimate significance

doi:10.1016/j.catena.2022.106095

	Determination of the optimized late Pleistocene chronology of a lacustrine sedimentary core from the Heqing Basin by geomagnetic paleointensity and its paleoclimate significance
	Xu, Xinwen 4,5; Qiang, Xiaoke 1,4; Li, Xubin 3; Qiu, Haijun 5; Zhao, Hui 4; Fu, Chaofeng 2; Yang, Ziyi 4
刊名	CATENA
	2022-05-01
卷号	212 页码:12
关键词	Lacustrine sediments Heqing drill core Rock magnetism Relative paleointensity Indian summer monsoon Last glacial cycle
ISSN号	0341-8162
DOI	10.1016/j.catena.2022.106095
通讯作者	Qiang, Xiaoke(qiangxk@loess.llqg.ac.cn)
英文摘要	Long and continuous lacustrine sedimentary sequences from SW China faithfully recorded the evolution of the Indian summer monsoon (ISM). However, the limited dating range (< 50 ka) of C-14 dating has restricted high resolution research on the last glacial cycle.We presented a relative paleointensity (RPI) record from a lacustrine sedimentary core from the Heqing Basin to optimize its AMS C-14 chronology. Detailed rock magnetic analyses indicated that SD and vortex state magnetite (and/or maghemite) was the dominant magnetic mineral of lacustrine sediments. Moderate variations in concentration-dependent (SIRM, ARM) and grain-size-dependent (ARM/SIRM) parameters satisfied the criteria for the RPI studies. Consequently, we determined the RPI by NRM20-40 mT/SIRM20-40 mT, where NRM20-40 mT denotes the NRM after demagnetization between 20 and 40 mT. Using 6 AMS C-14 dates younger than 40 ka BP as constraints, 7 age control points were determined by correlating the lows in the RPI record with those of the target paleointensity stacks PISO-1500. We established a reliable chronological framework of the upper 11.1 m of the HQ drill core by binomial fitting based on the 7 RPI age control points and the climatic transition termination II. The consistent variations in our RPI curve and other global target paleointensity curves indicated that the optimized chronology was reliable.In our optimized chronology, the visible precession cycle in ARM/SIRM indicated that the ISM was a direct response to solar insolation during the last glacial cycle. The strong ISM suggested by the high content of Mesic conifers and tropical and subtropical trees during MIS 3 shifted to MIS 5a. Thus, the "MIS 3 Mega-paleolake " hypothesis in China, which was mainly deduced by the C-14 age model, was challenged.
资助项目	National Natural Science Foundation of China[42172203] ; National Natural Science Foundation of China[41402151] ; National Natural Science Foundation of China[41572164] ; Open Fund of the State Key Laboratory of Loess and Quaternary Geology[SKLLQG2009]
WOS关键词	INDIAN-SUMMER MONSOON ; HIGH-RESOLUTION ; RELATIVE PALEOINTENSITY ; SOUTHWESTERN CHINA ; YUNNAN PROVINCE ; TIBETAN PLATEAU ; ASIAN MONSOON ; QINGHAI LAKE ; ARABIAN SEA ; LAST
WOS研究方向	Geology ; Agriculture ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000788496100002
资助机构	National Natural Science Foundation of China ; Open Fund of the State Key Laboratory of Loess and Quaternary Geology
内容类型	期刊论文
源URL	[http://ir.ieecas.cn/handle/361006/17734]
专题	地球环境研究所_古环境研究室
通讯作者	Qiang, Xiaoke
作者单位	1.97 Yanxiang Rd, Xian 710061, Shaanxi, Peoples R China 2.Changan Univ, Key Lab Western Mineral Resources & Geol Engn, Minist Educ China, Xian 710054, Peoples R China 3.Northwest Water Conservancy & Hydropower Engn Co L, Xian 710100, Peoples R China 4.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China 5.Northwest Univ, Coll Urban & Environm Sci, Shaanxi Key Lab Earth Surface Syst & Environm Carr, Xian 710127, Peoples R China
推荐引用方式 GB/T 7714	Xu, Xinwen,Qiang, Xiaoke,Li, Xubin,et al. Determination of the optimized late Pleistocene chronology of a lacustrine sedimentary core from the Heqing Basin by geomagnetic paleointensity and its paleoclimate significance[J]. CATENA,2022,212:12.
APA	Xu, Xinwen.,Qiang, Xiaoke.,Li, Xubin.,Qiu, Haijun.,Zhao, Hui.,...&Yang, Ziyi.(2022).Determination of the optimized late Pleistocene chronology of a lacustrine sedimentary core from the Heqing Basin by geomagnetic paleointensity and its paleoclimate significance.CATENA,212,12.
MLA	Xu, Xinwen,et al."Determination of the optimized late Pleistocene chronology of a lacustrine sedimentary core from the Heqing Basin by geomagnetic paleointensity and its paleoclimate significance".CATENA 212(2022):12.