Basic chemical compositions combination rules and quantitative criterion of red beds

IF 3.2 2区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Solid Earth Pub Date : 2024-01-29 DOI:10.5194/egusphere-2023-2590

Guangjun Cui, Jin Liao, Linghua Kong, Cuiying Zhou, Zhen Liu, Lei Yu, Lihai Zhang

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Abstract

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. Existing research often identifies red beds from a qualitative or semi quantitative 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 rapid quantitative identification criterion based on the basic chemical compositions combination rules in the red beds. By collecting chemical compositions data of rocks containing red beds, a total of 241,405 groups data were collected for qualitative and quantitative comparison between multiple sets of chemical composition combinations. The results indicate that simultaneously meeting the following chemical composition combinations can serve as a quantitative criterion for distinguishing red beds from other rocks: SiO₂+Al₂O₃ ≈ 50.7 %~85.0 %, Al₂O₃/SiO₂ ≈ 0.14~0.41, FeO+Fe₂O₃ ≈ 0.9 %~7.9 %, Fe₂O₃/FeO ≈ 1.52~7.70, K₂O+Na₂O ≈ 1.6 %~6.8 %, Na₂O/K₂O ≈ 0.02~0.43, CaO+MgO ≈ 0.8 %~9.2 %. 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 are effective.

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红床的基本化学成分组合规则和定量标准

摘要红床属于滑动地层，快速识别红床对地质灾害风险评估、快速响应等重大科学和工程问题具有重要意义。现有研究往往从定性或半定量的角度识别红床，导致识别速度慢、识别结果不准确，难以快速处置滑坡地质灾害。本研究结合红床地貌特征、矿物成分、化学成分之间的相关性，根据红床的基本化学成分组合规律，建立了快速定量识别标准。通过收集含红层岩石的化学成分数据，共收集了 241 405 组数据，对多组化学成分组合进行了定性和定量比较。结果表明，同时满足以下化学成分组合可作为区分红床与其他岩石的定量标准：SiO2+Al2O3 ≈ 50.7 %~85.0 %，Al2O3/SiO2 ≈ 0.14~0.41，FeO+Fe2O3 ≈ 0.9 %~7.9 %，Fe2O3/FeO ≈ 1.52~7.70，K2O+Na2O ≈ 1.6 %~6.8 %，Na2O/K2O ≈ 0.02~0.43，CaO+MgO ≈ 0.8 %~9.2 %。通过比较本研究从中国采集的 15 种岩石的化学成分组合，证明本研究提出的定量标准是有效的。

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来源期刊

Solid Earth GEOCHEMISTRY & GEOPHYSICS-

CiteScore

6.90

自引率

8.80%

发文量

审稿时长

4.5 months

期刊介绍： Solid Earth (SE) is a not-for-profit journal that publishes multidisciplinary research on the composition, structure, dynamics of the Earth from the surface to the deep interior at all spatial and temporal scales. The journal invites contributions encompassing observational, experimental, and theoretical investigations in the form of short communications, research articles, method articles, review articles, and discussion and commentaries on all aspects of the solid Earth (for details see manuscript types). Being interdisciplinary in scope, SE covers the following disciplines: geochemistry, mineralogy, petrology, volcanology; geodesy and gravity; geodynamics: numerical and analogue modeling of geoprocesses; geoelectrics and electromagnetics; geomagnetism; geomorphology, morphotectonics, and paleoseismology; rock physics; seismics and seismology; critical zone science (Earth''s permeable near-surface layer); stratigraphy, sedimentology, and palaeontology; rock deformation, structural geology, and tectonics.