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Determination of the optimized late Pleistocene chronology of a lacustrine sedimentary core from the Heqing Basin by geomagnetic paleointensity and its paleoclimate significance
Xu, Xinwen1,2; Qiang, Xiaoke2,5; Li, Xubin3; Qiu, Haijun1; Zhao, Hui2; Fu, Chaofeng4; Yang, Ziyi2
Corresponding AuthorQiang, Xiaoke(qiangxk@loess.llqg.ac.cn)
2022-05-01
Source PublicationCATENA
ISSN0341-8162
Volume212Pages:12
AbstractLong 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.
KeywordLacustrine sediments Heqing drill core Rock magnetism Relative paleointensity Indian summer monsoon Last glacial cycle
DOI10.1016/j.catena.2022.106095
WOS KeywordINDIAN-SUMMER MONSOON ; HIGH-RESOLUTION ; RELATIVE PALEOINTENSITY ; SOUTHWESTERN CHINA ; YUNNAN PROVINCE ; TIBETAN PLATEAU ; ASIAN MONSOON ; QINGHAI LAKE ; ARABIAN SEA ; LAST
Indexed BySCI ; SCI
Language英语
Funding ProjectNational 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 Research AreaGeology ; Agriculture ; Water Resources
Funding OrganizationNational Natural Science Foundation of China ; Open Fund of the State Key Laboratory of Loess and Quaternary Geology
WOS SubjectGeosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS IDWOS:000788496100002
PublisherELSEVIER
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/17735
Collection古环境研究室
Corresponding AuthorQiang, Xiaoke
Affiliation1.Northwest Univ, Coll Urban & Environm Sci, Shaanxi Key Lab Earth Surface Syst & Environm Carr, Xian 710127, Peoples R China
2.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
3.Northwest Water Conservancy & Hydropower Engn Co L, Xian 710100, Peoples R China
4.Changan Univ, Key Lab Western Mineral Resources & Geol Engn, Minist Educ China, Xian 710054, Peoples R China
5.97 Yanxiang Rd, Xian 710061, Shaanxi, Peoples R China
Recommended Citation
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.
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