The chromaticity parameters and paleoclimate changes of loess profile in Luonan Basin, Shaanxi Province

ZHI Yu; BIAN Huiying; SONG Fei; LI Haoran

doi:10.12097/gbc.2023.07.008

2025 Vol. 44, No. 6

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ZHI Yu, BIAN Huiying, SONG Fei, LI Haoran. 2025. The chromaticity parameters and paleoclimate changes of loess profile in Luonan Basin, Shaanxi Province. Geological Bulletin of China, 44(6): 1151-1163. doi: 10.12097/gbc.2023.07.008

Citation:

ZHI Yu, BIAN Huiying, SONG Fei, LI Haoran. 2025. The chromaticity parameters and paleoclimate changes of loess profile in Luonan Basin, Shaanxi Province. Geological Bulletin of China, 44(6): 1151-1163. doi: 10.12097/gbc.2023.07.008

The chromaticity parameters and paleoclimate changes of loess profile in Luonan Basin, Shaanxi Province

1.
School of Geological Engineering and Geomatics, Chang 'an University, Xi 'an 710054, Shaanxi , China
2.
Shaanxi Institute of Geo-Environment Monitoring, Xi 'an 710054, Shaanxi , China
3.
Shaanxi Institute of Engineering Prospecting, Xi’an 710068, Shaanxi, China

Fund Project: Supported by National Natural Science Foundation of China (Nos. 41877247, SQZB2021-135).

More Information

Author Bio: ZHI Yu, female, born in 1999, M.S. candidate, mainly engaged in geological resources and geological engineering; E-mail: 2622146526@qq.com
Corresponding author: SONG Fei, male, born in 1976, Ph.D., associate professor, engaged in research on loess engineering geology, geological disasters; E-mail: 250846105@qq.com

Received Date: 04 July 2023

Revised Date: 15 September 2023

Publish Date: 15 June 2025

Abstract

Abstract

Objective
Taking the typical Luonan profile (LN profile) as the research object, this study analyzes the variations of chromaticity indices and other climatic proxy indices along the profile, and explores the paleoenvironmental significance of the chromaticity indices of the LN profile and the paleoclimatic changes in the Luonan Basin during the mid-to-late Middle Pleistocene.
Methods
Comprehensive analysis was conducted on chromaticity parameters, grain size, magnetic susceptibility, and Rb/Sr values at different depths of the LN profile.
Results
The results show that:①The chromaticity parameters exhibit regular variations across different stratigraphic units in the profile. Luminance (L^*) and hue angle (h^*) are higher in loess layers than in paleosol layers, with high values indicating relatively dry and cold climatic conditions. In contrast, redness (a^*) and the redness/yellowness ratio (a^*/b^*) are higher in paleosol layers (S1–S6) than in loess layers (L1–L7), with high values indicating relatively warm and humid environments. L^*, a^*, a^*/b^*, and h^* can all serve as good climatic proxy indices to indicate climate changes in this region.② Chromaticity and other climatic proxy indices collectively reveal the climatic changes in the Luonan Basin during the mid-to-late Middle Pleistocene. The accumulation period of loess layers corresponds to cold and humid climatic conditions, while the accumulation period of paleosol layers corresponds to warm and humid conditions.
Conclusions
Unlike the dry-cold to warm-wet climate cycles in the Loess Plateau, the Luonan region exhibits a climate cycle of cold-humid to warm-humid. The overall sedimentary environment was humid, with strong weathering and pedogenesis, experiencing a climatic change pattern of cold-wet → warm-wet → cold-wet. The research results provide insights for correctly understanding the living environment and climatic changes of paleohumans in the East Qinling and surrounding areas during the Middle Pleistocene.
- Luonan Basin /
- loess-paleosol sequence /
- chromaticity parameters /
- Middle Pleistocene /
- climate change /
- environment geological survey engineering

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References

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