Hydroxy-interlayered minerals in the Holocene paleosol on the southernmost Loess Plateau, China

Huang, Chuan Qin; Wang, Mi Nan; Tan, Wei; Wang, Ming Kuang; Koopal, L.K.

doi:10.1016/j.clay.2017.12.007

Cited by 12 publications

(2 citation statements)

References 30 publications

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“…In the MIR region, the absorption bands at ~3697 cm −1 and ~3620 cm −1 (OH stretching of hydroxyl groups) are detected in all samples throughout the profile, further confirming the presence of kaolinite and dioctahedral 2:1 clay minerals (i.e., illite and smectite; Figure 4b) (Huang et al, 2018; Nguyen‐Thanh et al, 2017). The absorption bands in the OH bending and Si–O stretching regions (bands at ~1032 cm −1 , 1010 cm −1 , 918, 698, 535 and 470 cm −1 ) also confirm the presence of these minerals (Szymański et al, 2014; Wu et al, 2014).…”

Section: Resultssupporting

confidence: 58%

Fusion of visible near‐infrared and mid‐infrared data for modelling key soil‐forming processes in loess soils

Zhao

Hong

Algeo

et al. 2022

European J Soil Science

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Pedogenic weathering of aeolian materials plays an essential role in global nutrient and carbon cycling. A quick and effective approach for temporally high‐resolution and spatially large‐scale pedogenic investigations has long been needed. Here, we used visible and near‐infrared, mid‐infrared and sensor‐fused data to predict pedogenesis‐related soil properties (i.e., grain‐size distribution, clay‐mineral properties and geochemical ratios) in a thick loess sequence in central China. Sensor fusion was achieved at three different levels: (1) direct combination of spectral parameters (low‐level fusion; Fusionpara); (2) combination of spectral features selected by principal component analysis (middle‐level fusion; FusionPCA) and (3) fusion using outer product analysis (high‐level fusion; FusionOPA). Sensor‐fusion generally improves the model predictions for all soil properties, with increases in the values of the model efficiency coefficient (MEC) of 8% and the performance‐to‐interquartile range of 12%. Whole‐soil properties are optimally predicted with the Fusionpara dataset using the random forest algorithm, yielding a mean MEC of 0.85. Spectral parameters D2200/D1900 and AS2200 are demonstrated as promising new pedogenic proxies, with higher values indicating more intense hydrolysis during pedogenesis. Spectral proxies along the loess sequence suggest that intense soil formation occurred during warm and humid interglacial periods when the East Asian summer monsoon intensified. The sensor‐fusion technique improved model performance for assessing mineral transformations and chemical weathering intensity, providing a quick and efficient means of interpreting pedogenic evolution, especially in the case of spatially large‐scale soil investigations. Highlights Fusion of VNIR and MIR spectra to model loess pedogenesis. Spectral modeling provides a robust surrogate for pedogenic evolution studies. Sensor fusion improves the performance of chemometric models. Sensor‐fusion models can reconstruct loess pedogenesis.

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Section: Resultssupporting

confidence: 58%

Fusion of visible near‐infrared and mid‐infrared data for modelling key soil‐forming processes in loess soils

Zhao

Hong

Algeo

et al. 2022

European J Soil Science

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“…Al-(hydr)oxides with larger SRO Al fractions (poorer crystallinity) are more readily mobilized than more crystalline phases, leading to greater quantities of free Al 3+ ions in soil water (Rennert 2019). The HH experienced intense hydrolysis during the deposition-pedogenesis process, and the detrital clay minerals transformed to thermodynamically more stable clay species through chemical weathering (Singer 1980;Huang et al 2018). The acid ions (especially H + and Al 3+ ), along with other cations (i.e., Ca 2+ and Mg 2+ ), accumulated in the HH during the strong hydrolysis process.…”

Section: Coupling Between Soil Acidity Pools and Hiv Formationmentioning

confidence: 99%

Hydrologic regulation of clay-mineral transformations in a redoximorphic soil of subtropical monsoonal China

Zhao,

Hong,

Fang

et al. 2023

American Mineralogist

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Review Article. What are the nature and formation conditions of hydroxy‐interlayered minerals (HIMs) in soil?

Georgiadis

Dietel

Dohrmann

et al. 2019

J. Plant Nutr. Soil Sci.

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Primary minerals of the parent material undergo weathering during the formation of terrestrial soils to varying extent. As a result, secondary minerals develop, which comprise, among many others, hydroxy-interlayered minerals (HIMs). These minerals have formed by interlayering of hydroxy-metal complexes (especially of Al 3+ , also Mg 2+ , Fe 2+/3+ ) into micas, expansible 2:1 phyllosilicates and forming oligomers, or by weathering of primary chlorite. The degree of interlayer filling and the stability of these fillings affect several physico-chemical soil properties, for instance the cation exchange capacity. Although many studies have been conducted on formation, occurrence, and properties of HIMs in soil during the last decades, several challenges still exist. These challenges include analytical identification and quantification of HIMs in soil, the nature of the interlayer filling and the identification of favorable conditions in soil for the formation of HIMs. In order to deepen the understanding of formation, properties, and fate of HIMs in soil, we critically reviewed the available literature. Based on the review, we recommend using a new structural model that enables quantification of hydroxy-interlayered smectite in soil by X-ray diffractometry, laboratory experiments on the formation and preservation of different types of interlayers and considering the temporal and spatial dimension of the formation of HIMs in soil in more detail.

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Hydroxy-interlayered minerals in the Holocene paleosol on the southernmost Loess Plateau, China

Cited by 12 publications

References 30 publications

Fusion of visible near‐infrared and mid‐infrared data for modelling key soil‐forming processes in loess soils

Fusion of visible near‐infrared and mid‐infrared data for modelling key soil‐forming processes in loess soils

Hydrologic regulation of clay-mineral transformations in a redoximorphic soil of subtropical monsoonal China

Review Article. What are the nature and formation conditions of hydroxy‐interlayered minerals (HIMs) in soil?

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