New insights into microbial smectite illitization in the Permo-Triassic boundary K-bentonites, South China

Fang, Qian; Churchman, G. Jock; Hong, Hanlie; Chen, Zhong‐Qiang; Liu, Jiacheng; Yu, Jianxin; Han, Wen; Wang, Chaowen; Zhao, Lulu; Furnes, Harald

doi:10.1016/j.clay.2017.01.029

Cited by 25 publications

(12 citation statements)

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“…Continuum removal analysis is a particularly robust tool for detecting and predicting iron oxides and phyllosilicate minerals. us, it is feasible to substitute a statistical method to apply to soil mineralogy studies [10,20,22,24].…”

Section: Spectral Preprocessingmentioning

confidence: 99%

“…e geometric features of the spectra are more suitable for monitoring the molecular structural changes of soil minerals, since the variations of the absorption bands are caused by electron transitions (e.g., Fe 2+ to Fe 3+ ) and molecular vibration (e.g., Al-OH versus H 2 O). us, spectral measurement is widely and successfully applied to (1) measure mineral physicochemistry that is sensitive to changes in metamorphic grade [53,81], (2) map and monitor mineral erosion, deposition, and weathering of minerals [24,51], and (3) explore water and potential life on extraterrestrial objects [10,21]. Chemometric methods are more often used in monitoring overall soil properties, since almost all of the signals in the VNIR domain are involved in the modeling process.…”

Section: Application Preferencementioning

confidence: 99%

“…e most commonly used method to characterize soil minerals is XRD, which is fundamentally qualitative. Since soil clay minerals are generally more complex and less well crystallized than those of geological environments [9][10][11], they display more complicated XRD patterns [12,13]. Despite quantitative improvements of XRD [14], mineral characterization is usually expensive and time-consuming [2].…”

Section: Introductionmentioning

confidence: 99%

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Visible and Near-Infrared Reflectance Spectroscopy for Investigating Soil Mineralogy: A Review

Fang

Hong

Zhao

et al. 2018

Journal of Spectroscopy

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114

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Clay minerals are the most reactive and important inorganic components in soils, but soil mineralogy classifies as a minor topic in soil sciences. Revisiting soil mineralogy has been gradually required. Clay minerals in soils are more complex and less well crystallized than those in sedimentary rocks, and thus, they display more complicated X-ray diffraction (XRD) patterns. Traditional characterization methods such as XRD are usually expensive and time-consuming, and they are therefore inappropriate for large datasets, whereas visible and near-infrared reflectance spectroscopy (VNIR) is a quick, cost-efficient, and nondestructive technique for analyzing soil mineralogic properties of large datasets. The main objectives of this review are to bring readers up to date with information and understanding of VNIR as it relates to soil mineralogy and attracts more attention from a wide variety of readers to revisit soil mineralogy. We begin our review with a description of fundamentals of VNIR. We then review common methods to process soil VNIR spectra and summary spectral features of soil minerals with particular attention to those <2 μm fractions. We further critically review applications of chemometric methods and related model building in spectroscopic soil mineral studies. We then compare spectral measurement with multivariate calibration methods, and we suggest that they both produce excellent results depending on the situation. Finally, we suggest a few avenues of future research, including the development of theoretical calibrations of VNIR more suitable for various soil samples worldwide, better elucidation of clay mineral-soil organic carbon (SOC) interactions, and building the concept of integrated soil mapping through combined information (e.g., mineral composition, soil organic matter-SOM, SOC, pH, and moisture).

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Section: Spectral Preprocessingmentioning

confidence: 99%

Section: Application Preferencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Visible and Near-Infrared Reflectance Spectroscopy for Investigating Soil Mineralogy: A Review

Fang

Hong

Zhao

et al. 2018

Journal of Spectroscopy

Self Cite

114

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“…Some paleosols may have originally been illitic in composition, like some desert soils of regions with strong seasonality effects, and lower productivity soils of the Paleozoic and Precambrian may have been illitic in composition [ 70 ]. However, mounting evidence from laboratory studies [ 71 , 72 , 73 ] and paleosol observations [ 70 , 74 ] suggest that illitization of smectite is common in the geological record.…”

Section: Introductionmentioning

confidence: 99%

“…The maturation of organic matter has been implicated in accelerating the conversion rate of smectite to illite by increasing the Gibbs free energy of illite growth [ 75 ]. Microbial mediation of illitization in dioctahedral smectites has been documented [ 73 ], and the desorption or decomposition of organic matter adsorbed in smectite interlayers at temperatures above 350 °C may control the degree of smectite illitization [ 71 ]. Similarly, common organic acids like acetate and oxalate can liberate Al and K ions to pore fluids by the dissolution of smectites, K-feldspar and muscovites [ 72 ].…”

Section: Introductionmentioning

confidence: 99%

Organic Matter Preservation in Ancient Soils of Earth and Mars

Broz

2020

Life

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The emerging field of astropedology is the study of ancient soils on Earth and other planetary bodies. Examination of the complex factors that control the preservation of organic matter and other biosignatures in ancient soils is a high priority for current and future missions to Mars. Though previously defined by biological activity, an updated definition of soil as planetary surfaces altered in place by biological, chemical or physical processes was adopted in 2017 by the Soil Science Society of America in response to mounting evidence of pedogenic-like features on Mars. Ancient (4.1–3.7 billion year old [Byr]) phyllosilicate-rich surface environments on Mars show evidence of sustained subaerial weathering of sediments with liquid water at circumneutral pH, which is a soil-forming process. The accumulation of buried, fossilized soils, or paleosols, has been widely observed on Earth, and recent investigations suggest paleosol-like features may be widespread across the surface of Mars. However, the complex array of preservation and degradation factors controlling the fate of biosignatures in paleosols remains unexplored. This paper identifies the dominant factors contributing to the preservation and degradation of organic carbon in paleosols through the geological record on Earth, and offers suggestions for prioritizing locations for in situ biosignature detection and Mars Sample Return across a diverse array of potential paleosols and paleoenvironments of early Mars. A compilation of previously published data and original research spanning a diverse suite of paleosols from the Pleistocene (1 Myr) to the Archean (3.7 Byr) show that redox state is the predominant control for the organic matter content of paleosols. Most notably, the chemically reduced surface horizons (layers) of Archean (2.3 Byr) paleosols have organic matter concentrations ranging from 0.014–0.25%. However, clay mineralogy, amorphous phase abundance, diagenetic alteration and sulfur content are all significant factors that influence the preservation of organic carbon. The surface layers of paleosols that formed under chemically reducing conditions with high amounts of iron/magnesium smectites and amorphous colloids should be considered high priority locations for biosignature investigation within subaerial paleoenvironments on Mars.

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Response Surface Methodology for the Optimization of 4-Nitrophenol Degradation by a Heterogeneous Fenton-Like Reaction on Moroccan Pillared Clays

Baragh

Draoui

Bali

et al. 2020

Advances in Intelligent Systems and Computing

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New insights into microbial smectite illitization in the Permo-Triassic boundary K-bentonites, South China

Cited by 25 publications

References 100 publications

Visible and Near-Infrared Reflectance Spectroscopy for Investigating Soil Mineralogy: A Review

Visible and Near-Infrared Reflectance Spectroscopy for Investigating Soil Mineralogy: A Review

Organic Matter Preservation in Ancient Soils of Earth and Mars

Response Surface Methodology for the Optimization of 4-Nitrophenol Degradation by a Heterogeneous Fenton-Like Reaction on Moroccan Pillared Clays

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