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Oxidation State of Iron in Glauconite from Oxidized and Reduced Zones of Soil-Geologic Columns
Glauconite Iron Mossbauer spectroscopy Oxidized zone Pyrite Reduced zone Soil
2011/11/30
Abstract: Glauconite from the oxidized and reduced zones of soil-geologic columns at two Coastal Plain sites, one in Maryland and one in New Jersey, was examined by M鰏sbauer spectroscopy. The data ind...
Radiogenic Argon Released by Stepwise Heating of Glauconite and Illite: The Influence of Composition and Particle Size
Argon Dehydroxylation Glauconite Illite
2011/12/27
Various size fractions of several samples of glauconitic clay and illite were heated stepwise under vacuum for extended periods to: 1) evaluate radiogenic-argon (Ar) yields in relation to composition ...
Computer Simulation of Cation Distribution in Dioctahedral 2:1 Layer Silicates Using IR-Data: Application to Mossbauer Spectroscopy of a Glauconite Sample
Cation distribution Computer simulation Glauconite Mossbauer spectra
2011/12/31
A new approach is described to computer simulate cation distribution in octahedral sheets of dioctahedral 2:1 layer silicates with vacant trans-octahedra. This approach makes use of the information on...
Fe Substitution for Al in Glauconite with Increasing Diagenesis in the First Wilcox Sandstone (Lower Eocene), Livingston Parish, Louisiana
Ankerite cement Diagenesis Glauconite Illite/smectite Iron Potassium
2011/11/30
Abstract: Glauconites in early ankerite concretions, ferroan calcite-cemented sandstones, and uncemented sandstones in the first Wilcox sandstone of the Lockhart Crossing field, Livingston Parish, Lou...
Fe-Smectite-Glauconite Transition in Hydrothermal Green Clays from the Galapagos Spreading Center
Deep-sea hydrothermal clay Glauconite Smectite Transmission electron microscopy X-ray powder diffraction
2012/1/9
X-ray powder diffraction (XRD) and energy-dispersive X-ray analyses (EDX) of individual clay particles from hydrothermal mounds in the Galapagos spreading center (GSC) (Deep Sea Drilling Project, hole...
Interpretation of Mossbauer Spectra of Nontronite, Celadonite, and Glauconite
Atomic coordinates Celadonite Electric field gradient Glauconite Mossbauer spectroscopy Nontronite
2012/1/11
A new approach to the interpretation of Mössbauer spectra of Fe3+-phyllosilicates having vacant trans-octahedra is based on (1) crystal structure simulation methods that allow for the size and th...
Iron Substitution in Montmorillonite, Illite, and Glauconite by 57Fe Mossbauer Spectroscopy
Glauconite Illite Iron Montmorillonite Mossbauer spectra
2012/1/10
The 57Fe M鰏sbauer spectra of an iron-rich montmorillonite, an illite, and two glauconites were measured and computer-fitted with appropriate Fe3+ and Fe2+ doublet resonances. The broad experimental Fe...
Syntheses of Glauconite at Surface Temperatures
Glauconite Diagenesis Pore solutions Synthesis
2012/2/9
Glauconite has been synthesized at low temperature by precipitation of Fe-hydroxides from Si-, Fe-, Al-, and K-containing solutions under reducing conditions. The compositions favorable for the synthe...
A Mossbauer Investigation of Glauconite and Its Geological Significance
Genesis Glauconite Iron oxidation Mossbauer spectroscopy
2012/2/10
Mossbauer spectra of 9 glauconite samples from Upper Cretaceous and Lower Tertiary strata in the South Island of New Zealand contain a broad shoulder due to low intensity absorption continuous between...
Mossbauer Characteristics of Cambrian Glauconite, Central U.S.A.
Mossbauer Characteristics Cambrian Glauconite
2012/2/13
Mossbauer characteristics of 57Fe nuclci in 8 samples of mineral glauconite of Cambrian age and one sample of Cretaceous age (slightly disordered) were obtained at temperatures between 50 and 295 K to...
Microstructure, Mineralogy and Chemistry of Cambrian Glauconite Pellets and Glauconite, Central U.S.A.
Microstructure Mineralogy Cambrian Glauconite Pellets
2012/2/13
Glauconite pellets in the Cambrian of the central U.S.A. frequently contain two textural forms of glauconite–aggregate and oriented—which differ in both mineralogy and chemistry. The aggregate glaucon...
Further Information Related to the Origin of Glauconite
Further Information Origin Glauconite
2012/2/15
Glauconite-smectite and illite-smectite interlayered minerals are compared by various means in an attempt to establish the mineralogical relations between the two groups. Experiments at 2 Kb pressure ...
The Mineralogy of Glauconite
Mineralogy Glauconite
2012/2/14
The mineral in monomineralic glauconite pellets is an iron-rich mixed-layer illite-smectite (here called glauconite), often composed almost entirely of illite layers. The nature of the interlayering i...
Glauconite Pellets: Similar X-Ray Patterns from Individual Pellets of Lobate and Vermiform Morphology
Glauconite Pellets Similar X-Ray Patterns Individual Pellets Lobate Vermiform Morphology
2012/2/21
Glauconite pellets of vermiform and lobate morphology occur together in Eocene geologic formations in Maryland. Morphologically, the vermiform pellets appear to be identical to those that have previou...