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Basic chemical composition combination rules and quantitative criterion of red beds
Basic chemical composition combination rules and quantitative criterion of red beds
- Source :
- Solid Earth, Vol 15, Pp 1185-1201 (2024)
- Publication Year :
- 2024
- Publisher :
- Copernicus Publications, 2024.
-
Abstract
- Red beds belong to slippery formations, and their rapid identification is of great significance for major scientific and engineering issues, such as geological hazard risk assessment and rapid response to geological disasters. Existing research often identifies red beds from a qualitative or semiquantitative perspective, resulting in slow recognition speed and inaccurate recognition results, making it difficult to quickly handle landslide geological disasters. Combined with the correlation between red beds' geomorphic characteristics, mineral compositions, and chemical compositions, this study established a preliminary identification quantitative criterion based on the basic chemical composition combination rules (SiO2+Al2O3, Al2O3/SiO2, FeO+Fe2O3, Fe2O3/FeO, K2O+Na2O, Na2O/K2O, CaO+MgO, and MgO/CaO) in the red beds. Following this, we perform principal component analysis on the basic chemical composition combination rules mentioned above. The results indicate that simultaneously meeting the following principal component features can serve as a rapid quantitative criterion for distinguishing red beds from other rocks: F1=-3.36–23.55; F2=-23.00–3.11; F3=-10.12–4.88; F4=-2.21–4.52; F5=-0.97–7.30; and F=-0.67–1.89. By comparing the chemical composition combinations of 15 kinds of rocks collected from China in this study, it is proven that the quantitative criterion proposed in this study is effective. The study results can be used for rapid identification of red beds, achieving risk assessment and rapid response to geological disasters such as landslides.
- Subjects :
- Geology
QE1-996.5
Stratigraphy
QE640-699
Subjects
Details
- Language :
- English
- ISSN :
- 18699510 and 18699529
- Volume :
- 15
- Database :
- Directory of Open Access Journals
- Journal :
- Solid Earth
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.6c1448c9000c4e8e8095312406ceda50
- Document Type :
- article
- Full Text :
- https://doi.org/10.5194/se-15-1185-2024