Characterization of the Major Elements and Paleoenvironmental Significance of the Shiyang Profile in the Weinan Basin, China

The enrichment and migration patterns of different chemical elements record paleoclimatic information in loess formations. The chemical elemental measurements of 245 samples from the Shiyang profile in the Weinan Region were compared with the geochemical characteristics of typical wind-formed profil...

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Bibliographic Details
Published in:Atmosphere 2024-10, Vol.15 (10), p.1227
Main Authors: Cao, Jing, Dong, Qiuyao, Li, Chengxiang, Wang, Pan, Yang, Zhenjing, Chen, Hongyun
Format: Article
Language:English
Subjects:
Age
Aluminum oxide
Basins (Geology)
Chemical elements
Chemical weathering
Climate change
Composition
Continental crust
Environmental aspects
environmental evolution
Ferric oxide
genesis
Grain size
Holocene
Loess
Major elements
Natural history
Paleoclimatology
Particle size
Regional climates
Sediments
Shiyang loess-paleosol
Silica
Silicon dioxide
Soils
Stratigraphy
Testing
Titanium dioxide
Wind
Wind effects
Wind measurement
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Summary:The enrichment and migration patterns of different chemical elements record paleoclimatic information in loess formations. The chemical elemental measurements of 245 samples from the Shiyang profile in the Weinan Region were compared with the geochemical characteristics of typical wind-formed profiles, and the paleoclimatic evolution was discussed. The results showed the following: (1) the standardized curves of the cumulative concentrations of SiO2, Al2O3, and CaO along with the Upper Continental Crust (UCC) in the Shiyang profile exhibited significant similarities with typical wind-formed profiles. This strongly suggests that the Shiyang profile has a wind-formed origin. (2) The mean value of the chemical index of alteration (CIA) of the Shiyang profile is 62.06, indicating that the Shiyang profile has been in the stage of primary chemical weathering. (3) The ratios of K2O/Al2O3, TiO2/Al2O3, and Fe2O3/Al2O3 in the Shiyang profile are comparable to those found in typical wind-formed profiles, suggesting a common source area and supporting the premise that the Shiyang profile is of wind-induced origin.(4) The regional climate has undergone a series of transitions: from a dry and cool phase in the early Holocene to warm and humid yet unstable conditions in the middle Holocene, and returning to dry and cool during the late Holocene.
ISSN:2073-4433
2073-4433
DOI:10.3390/atmos15101227