Near-infrared spectroscopy: A powerful tool in studies of acid-treated clay minerals

Madejová, Jana; Pentrák, Martin; Pálková, Helena; Komadel, Peter

doi:10.1016/j.vibspec.2008.08.001

Cited by 128 publications

(80 citation statements)

References 36 publications

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“…Laboratory studies showed experimentally that smectite is the preferentially attacked clay mineral when clastics are exposed to acid solutions (Galan et al 1999, Martínez et al 2007. Smectite is surely faster dissolved in aqueous solution of mineral acids than illite; it results in a continuous decrease of CEC (Pentrák et al 2010) and amorphization (Madejová et al 2009). Also in weaker acids (at pH 3), CEC of smectite decreases due to its partial amorphization and illitization (Bauer et al 2001).…”

Section: Interpretation Of Key Correlation Horizons In Z3 Unitmentioning

confidence: 99%

Regional chemostratigraphic key horizons in the macrofossil-barren siliciclastic lower Miocene lacustrine sediments (Most Basin, Eger Graben, Czech Republic)

Grygar¹,

Mach²

2013

Bull. Geosci.

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Six sediment cores from two of four depocentres in the Most Basin, mostly consisting of macrofossil barren fluviodeltaic and lacustrine sediments of Holešice and Libkovice members of the Most Formation (lower Miocene, Burdigalian) were subjected to chemostratigraphic correlation, based on CEC and EDXRF proxy element analyses. CEC-step, prominent K/Al minima and crandallite-bearing horizons in monotonous lacustrine mudstones of the Libkovice Member provide several local isochronous or nearly isochronous key horizons, which we propose for a basin-scale correlation of the upper Most Basin sediment fill. These key horizons prove a spatially uniform sedimentary environment in a single lake (original area~1,000 km 2 ) during deposition of a considerable part of the siliciclastics overlying the main coal seam that tops the lower basin fill. We propose the CEC-step horizon as a novel boundary between Holešice and Libkovice members, i.e. the conversion of previously formal lithostratigraphic units to members with an isochronous boundary. That boundary together with recent sedimentological studies would assign Břešťany clay to the top of the Holešice Member. The upper boundary of the Libkovice Member could be the sediment coarsening related to a lake level decrease before deposition of Lom coal seam. The study will allow progress in palaeogeographic and palaeoenviromental reconstruction of the lower Miocene in the Most Basin. The proxy analyses (CEC vs Al/Si ratios) allow reliable numeric differentiation between kaolinite-rich, smectite-poor and smectite-rich clay assemblages in Holešice and Libkovice members. The plots of CEC vs Al/Si ratios should be applicable for fingerprinting any other monotonous lacustrine clastics with variable mineralogy of the clay assemblage.•

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Section: Interpretation Of Key Correlation Horizons In Z3 Unitmentioning

confidence: 99%

Regional chemostratigraphic key horizons in the macrofossil-barren siliciclastic lower Miocene lacustrine sediments (Most Basin, Eger Graben, Czech Republic)

Grygar¹,

Mach²

2013

Bull. Geosci.

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“…The band itself is attributable to interstitial H 2 O and (Si)O-H groups in differing structural environments [52] and clearly varies with Fe content. The sharp band located at ∼1650 cm −1 is due to the H-O-H bending mode of coordinated and/or adsorbed water [53], while the band at ∼5150 cm −1 is a combination band of molecular water [54,55]. Annealing at 450 • C reduces the 3500 cm −1 band strength by ∼30% with similar behaviour for the 1650 and 5150 cm −1 bands (Fig.…”

Section: Anp Hydrationmentioning

confidence: 64%

Amorphous silicate nanoparticles with controlled Fe-Mg pyroxene compositions

Thompson

Demyk

Day

et al. 2016

Journal of Non-Crystalline Solids

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The production of amorphous pyroxene nanoparticles (∼20 nm) with controlled Fe-Mg content is described. Homogenous particle compositions closely matching required target stoichiometries are obtained by drying a precursor gel under high vacuum conditions. The silicate nature of the particles is characterised using TEM, synchrotron radiation and FTIR. No oxide phase separation occurs, even at high Fe concentration. Structural domains exist within the nanoparticles that are typically ten times smaller than the physical particle size consistent with either a core-shell, or random network with multiple embedded domains, particle structure. Thermal annealing below the crystallisation temperature allows the ordered domain size to be further * Corresponding author reduced by a factor of ∼2.

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“…Clay is one of the most widely used fillers in paper [13] and the NIR spectrum of kaolinites shows bands at the exact same position as the sharper small bands observed for the photographic paper (7065 cm -1 and 4525 cm -1 ) [47,48].…”

Section: Spectral Interpretationmentioning

confidence: 98%

“…Hydroxyl and water in minerals and inorganic compounds have a band with an average position around 4200cm -1 due to M-OH motions, a second band assigned to H 2 O combination mode (bend + stretch) at 5200cm -1 for hydrated minerals and around 4600cm -1 for inner hydroxyls, and a third average band around 7100cm -1 corresponding to the Published in Anal Bioanal Chem 402 (2012) 1459-1469 7 first OH stretch overtone [46,47]. Clay is one of the most widely used fillers in paper [13] and the NIR spectrum of kaolinites shows bands at the exact same position as the sharper small bands observed for the photographic paper (7065 cm -1 and 4525 cm -1 ) [47,48].…”

Section: Spectral Interpretationmentioning

confidence: 99%

Non-destructive dating of fiber-based gelatin silver prints using near-infrared spectroscopy and multivariate analysis

et al. 2011

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An innovative approach to date fiber based gelatin silver prints using Near Infrared Spectroscopy and Multivariate Analysis (NIR/MVA) is presented. NIR spectra were acquired for 152 film stills printed in the US between 1914 and 1986 and Partial Least Square (PLS) analysis was used to correlate the spectra with the year the photographs were printed. Principal Component Analysis (PCA) and spectral interpretation helped clarify the underlying correlation between the print date and the composition and ageing of the photographic papers. The method was successfully validated with an independent set of 66 film stills printed in the US and a prediction error (RMSEP) of 6 years was achieved. The method was also tested on films stills printed in Germany and Russia, as well as amateur prints and photographs in the collection of the Museum of Modern Art (MoMA). The prediction error was significantly larger, with the exception of the amateur prints, due to differences in the composition and/or properties of the papers depending on their geographical origin and purpose as confirmed by Discriminant Analysis (PLS-DA) Published

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Near-infrared spectroscopy: A powerful tool in studies of acid-treated clay minerals

Cited by 128 publications

References 36 publications

Regional chemostratigraphic key horizons in the macrofossil-barren siliciclastic lower Miocene lacustrine sediments (Most Basin, Eger Graben, Czech Republic)

Regional chemostratigraphic key horizons in the macrofossil-barren siliciclastic lower Miocene lacustrine sediments (Most Basin, Eger Graben, Czech Republic)

Amorphous silicate nanoparticles with controlled Fe-Mg pyroxene compositions

Non-destructive dating of fiber-based gelatin silver prints using near-infrared spectroscopy and multivariate analysis

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