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Aliphatic hydrocarbons in structural channels of cordierite: A first evidence from polarized single-crystal IR-absorption spectroscopy
Aliphatic hydrocarbons channels of cordierite single-crystal IR-absorption spectroscopy
2012/3/31
Polarized IR-absorption spectra were measured on inclusion-free spots, 50 ?m in diameter of
(100)-, (010)-, and (001)-oriented single-crystal plates of orthorhombic cordierites extracted from
anatec...
Mineralogical Transformation of Bioweathered Granitic Biotite, Studied by HRTEM: Evidence for a New Pathway in Lichen Activity
Back-scattered Electrons Biotite Bioweathering Granite High-Resolution Transmission Electron Microscopy (HRTEM) Lattice-Fringe Images Lichens Vermiculite
2011/12/8
Abstract: The question of whether clay minerals can be biogenically transformed as a result of lichen activity at the lichen-rock interface remains unresolved. We applied several microscopical and ana...
Atomic-resolution transmission electron microscope evidence for the mechanism by which chlorite weathers to 1:1 semi-regular chlorite-vermiculite
Atomic-resolution transmission electron microscope evidence mechanism chlorite weathers semi-regular chlorite-vermiculite
2012/3/31
Atomic-resolution transmission electron microscope (TEM) images reveal that IIbb( b5 978 ) Mg,Al,Fe-chlorite from Koongarra, Australia, transforms to vermiculite via a range of intermediate chemical a...
Structural phase transition near 825 K in titanite: Evidence from infrared spectroscopic observations
Structural phase transition 825 K titanite Evidence infrared spectroscopic observations
2012/4/1
We report the direct experimental observation of a structural anomaly near 825 K insynthetic and natural titanite samples by high-temperature, hard-mode infrared spectros-copy. The anomaly in titanite...
Particle Shape versus Coherent Scattering Domain of Illite/Smectite: Evidence from HRTEM of Dolna Ves Clays
Coherent scattering domain Fundamental particle HRTEM Illite/Smectite Mixed-layer crystal
2011/12/27
Fundamental particle thickness measurements of Dolná Ves hydrothermal illite/smectite (I/S) samples confirmed earlier findings regarding the content of fixed cations in illite interlayers (ca. 0.9/O10...
Tem and X-Ray Diffraction Evidence for Cristobalite and Tridymite Stacking Sequences in Opal
Opal Transmission Electron Microscopy X-Ray Diffraction
2011/12/27
Abstract: In an attempt to resolve the structure of opal-CT and opal-C more precisely, 24 opal samples from bentonites, Fuller's Earths, zeolite tufts, biogenic silicas and silicified kaolins have bee...
In situ X-ray diffraction of aragonite and dolomite at high pressure and high temperature: Evidence for dolomite breakdown to aragonite and magnesite
X-ray diffraction aragonite dolomite high pressure high temperature Evidence aragonite magnesite
2012/4/5
Energy-dispersive X-ray powder diffraction spectra have been collected for aragonite (CaCOr) and dolomite [CaMg(COr)r] at high pressure and high temperature, using synchro-tron radiation and a cub...
TEM Observations of Coherent Stacking Relations in Smectite, I/S and Illite of Shales: Evidence for MacEwan Crystallites and Dominance of 2M1 Polytypism
2M1 Polytypism Coherent Fundamental Particles Illite I/S MacEwan Crystallites Optical Diffraction Patterns SAED Smectite Stacking Relations Cross Fringes
2011/12/23
Abstract: TEM characterization of stacking relations in I/S of expanded shale samples from the Gulf Coast and Michigan Basin was carried out to address the issues of the degree of coherency and the na...
Mechanism of CO32- substitution in carbonate-fluorapatite: Evidence from FTIR spectroscopy, 13C NMR, and quantum mechanical calculations---Reply to Nathan
Mechanism CO32- substitution carbonate-fluorapatite Evidence FTIR spectroscopy 13C NMR quantum mechanical calculations---Reply Nathan
2012/4/5
In the critical comment byNathan (1996), the author essentially claims that the samples used in our study (Regnier et al. 1994) werenot very appropriate to dem-onstrate the absence of C03P-. Furthermo...
Mechanism of CO32- substitution in carbonate-fluorapatite: Evidence from FTIR spectroscopy, 13C NMR, and quantum mechanical calculations---Discussion
Mechanism CO32- substitution carbonate-fluorapatite Evidence FTIR spectroscopy 13C NMR quantum mechanical calculations---Discussion
2012/4/5
The carbonate substitution in apatite continues to pro-voke controversies. In a recent paper, Regnier etal. (1994) challenged the existence of the hypothetical C03P- ion in carbonate-fluorapatite (fra...
Origin of the Bentonite Deposits of Eastern Milos, Aegean, Greece: Geological, Mineralogical and Geochemical Evidence
Authigenic K-feldspar Bentonite Electron microscopy Hydrothermal alteration Infrared spectroscopy Low temperature alteration Smectite X-ray diffraction X-ray fluorescence Zeolites
2011/12/1
Abstract: The Lower Pleistocene bentonite deposits of Eastern Milos, Greece have been formed at the expense of volcaniclastic rocks under submarine conditions. Systematic variation of the major chemic...
Mossbauer Spectroscopic Evidence for Citrate-Bicarbonate-Dithionite Extraction of Maghemite from Soils
Mossbauer spectroscopy Soil genesis
2011/12/1
Abstract: In a previous paper, we used powder X-ray diffraction and changes in magnetic susceptibility to argue the importance of pedogenic maghemite to soils and the efficacy of the chemical extracta...
Mechanism of Illitization of Bentonites in the Geothermal Field of Milos Island Greece: Evidence Based on Mineralogy, Chemistry, Particle Thickness and Morphology
Bentonite Hydrothermal alteration Illitization Illite/smectite Kaolinite Neoformation Ostwald ripening Solid state transformation
2011/12/28
Hydrothermal alteration has caused illitization along a 40m vertical profile in the Tsantilis bentonite deposit, Eastern Milos, Greece which consists principally of a Wyoming-type montmorillonite and ...
Some Evidence Supporting the Existence of Polar Layers in Mixed-Layer Illite/Smectite
Differential Thermal Analysis Mixed-layer illite/smectite Polar layer
2011/12/28
The fraction <20 祄 of a bentonitic material was selected to study the transformation of smectite into illite under hydrothermal conditions. Powder XRD showed that the studied material was composed of ...
Smectite-Illite Transition in Barbados Accretionary Wedge Sediments: TEM and AEM Evidence for Dissolution/Crystallization at Low Temperature
Accretionary wedge AEM analyses Barbados Electron diffraction Fluid-sediment interaction Illite Mixed-layer Smectite TEM images
2011/12/1
Abstract: Sediments from depths to 670 m in the Barbados accretionary complex and transecting the décollement zone have been studied by transmission and analytical electron microscopy (TEM/AEM). The s...