Significance of palaeoclimate indicators of geochemical indexes of palaeoflood profiles in Luoyang Basin,China
LI Songhan1, ZHANG Junna1, ZHANG Xiaohu2, ZHAO Haitao3, ZHAO Bolun4, HAN Zinan4
1 School of History,Capital Normal University,Beijing 100048,China; 2 Henan Provincial Institute of Cultural Heritage and Archaeology,Zhengzhou 450000,China; 3 Institute of Archaeology,Chinese Academy of Social Sciences,Beijing 100101,China; 4 College of Applied Arts and Science of Beijing Union University,Beijing 100191,China
Abstract In paleoclimate studies,geochemical indexes are predominantly employed in the analysis of loess,lake and other sediment types. However,the role of chemical elements in indicating palaeoclimate conditions in river sediments has been rarely investigated,primarily due to significant variations in sedimentary dynamics. In this paper,the significance of paleoclimate indicators derived from the geochemical index of the late Longshan Paleoflood section(SQ)dating from 4 to 3.8 ka BP in the Luoyang Basin. The analysis reveals a significant correlation between the chemical elements in the SQ profile and the median particle size. After accounting for the influences of provenance,sedimentary recycling and diagenetic potassium metasomatism on the chemical elements,the chemical elements were grouped based on the correlation coefficients with median particle size. Subsequently,we established chemical element parameter indexes according to the migration strength of the elements within the same group. The results are consistent with the CIA particle size effect correction findings,both indicating low values in the paleoflood layer,which suggests a dry and cool climate. Based on the results of palynology in this profile,it is concluded that the relatively mild,warm and cool climate in the Luoyang Basin serves as a significant environmental background for the occurrence of paleoflood events around 4 000 years ago. However,the complexity of the river deposition process presents limitations for this study. The method of grouping parameters offers a valuable approach to exploring the palaeoclimatic significance of chemical element indicators found in river sediments.
Fund:Co-funded by the National Natural Science Foundation of China(No.41971114),the major project of National Social Science Fund(Nos. 21&ZD223,18ZDA172)and the general projects of the National Social Science Fund(No.20BKG001)
Corresponding Authors:
ZHANG Junna,born in 1984,an associate professor,is mainly engaged in researches on environmental archaeology and Quaternary palaeoenvironmental evolution. E-mail: junnazhang84@163.com.
About author: About the first author LI Songhan,born in 2001,a postgraduate student,is mainly engaged in research on environmental archaeology. E-mail: 2220202014@cnu.edu.cn.
Cite this article:
LI Songhan,ZHANG Junna,ZHANG Xiaohu et al. Significance of palaeoclimate indicators of geochemical indexes of palaeoflood profiles in Luoyang Basin,China[J]. JOPC, 2024, 26(6): 1516-1530.
LI Songhan,ZHANG Junna,ZHANG Xiaohu et al. Significance of palaeoclimate indicators of geochemical indexes of palaeoflood profiles in Luoyang Basin,China[J]. JOPC, 2024, 26(6): 1516-1530.
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