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Preservation of Clay Minerals in the Precambrian (1.1 Ga) Nonesuch Formation in the Vicinity of the White Pine Copper Mine, Michigan
Chlorite Diagenesis Illite Mixed-layer illite/smectite Nonesuch Formation White mica
2011/12/28
The Middle Proterozoic (1.1 Ga) Nonesuch Formation, host of the stratiform copper deposit at White Pine, Michigan, consists of 200 m of principally dark grey clastic sediments which contain detritus o...
Monte Carlo Simulation of Interlayer Molecular Structure in Swelling Clay Minerals. 2. Monolayer Hydrates
Clay water systems Monte Carlo simulation swelling clays
2011/12/28
Monte Carlo (MC) simulations of interlayer molecular structure in monolayer hydrates of Na-saturated Wyoming-type montmorillonites and vermiculite were performed. Detailed comparison of the stimulatio...
Monte Carlo Simulation of Interlayer Molecular Structure in Swelling Clay Minerals. 1. Methodology
Clay-water systems Monte Carlo simulation Swelling clays
2011/12/28
Monte Carlo (MC) simulations of molecular structure in the interlayers of 2:1 Na-saturated clay minerals were performed to address several important simulation methodological issues. Investigation was...
Experimental Study on the Formation of Clay Minerals from Obsidian by Interaction with Acid Solution at 150° and 200°C
Acid solution Allophane Boehmite Experimental alteration Halloysite Obsidian Spherical kaolinite
2011/12/27
Experimental alteration of obsidian with HCl solution was performed to elucidate dissolution mechanism and formation process of clay minerals in acid solution. Reactions were carried out using 0.1, 0....
Quantification Curves for XRD Analysis of Mixed-Layer 14A/10A Clay Minerals
Biotite Chlorite Interstratification Mixed-layer quantification Vermiculite
2011/12/28
Using theoretical profiles of diffracted X-ray intensity for interstratification between layers having d-spacings around 14.3 侌 and 10.1 侌, a series of diagrams was derived from which the proportion o...
Clay Minerals in the MacAdams Sandstone, California: Implications for Substitution of H3O+ and H2O and Metastability of Illite
Electron microscopy Hydronium Illite Kaolinite Muscovite Rectorite
2011/12/1
Abstract: Clay minerals from the MacAdams Sandstone, Kettleman North Dome, California, have been studied by electron microscopy. The clay minerals fill pore space associated with fractured and breccia...
Sorption Properties of Carbon Composite Materials Formed from Layered Clay Minerals
Carbon Hydrotalcite Inverse gas chromatography Montmorillonite Nitrogen sorption Surface energy
2011/12/1
Abstract: The sorption properties of carbon-composite materials based on montmorillonite and hydrotalcite matrices have been studied using nitrogen adsorption isotherms and inverse gas chromatography....
The Composition and Origin of Vanadium-Rich Clay Minerals in Colorado Plateau Jurassic Sandstones
Chlorite Diagenegis Illite Microprobe Roseoelite Sandstone SEM Vanadium
2011/12/29
The composition and origin of vanadium-bearing clay minerals in the Jurassic (Morrison and Entrada Formations) sandstones of the Colorado Plateau are reassessed using microanalyses (microprobe and sca...
Evaluation of Standard Free Energies of Formation of Clay Minerals by an Improved Regression Method
Clay minerals Free energies of formation Regression method
2011/12/29
An improved regression method for the evaluation of standard free energies of formation (ΔG°f) of clay minerals is here proposed in an attempt to remove some of the limitations of the earlier method (...
Hysteresis in the Binary Exchange of Cations on 2:1 Clay Minerals: A Critical Review
cation exchange hysteresis quasi-crystal crystalline swelling kinetics smectites
2011/12/28
The binary exchange of cations on clays and soils is generally regarded as a thermodynamically reversible process. The literature on soil chemistry and geochemistry, however, abounds with reports on c...
Formation of Clay Minerals During Low Temperature Experimental Alteration of Obsidian
Allophane Dealkalized leached layer Fibrous material Nonstoichiometric dissolution Obsidian Smectite
2011/12/30
Experimental alteration of obsidian in distilled-deionized water at 150? 175? 200? and 225癈 was studied. The alteration products were examined by X-ray powder diffraction, scanning electron microscopy...
Alkali Cation Selectivity and Surface Charge of 2:1 Clay Minerals
Hard/soft acid/base model Ion exchange Isomorphic substitution Layer charge Lewis acid Lewis base Smectite Surface complexation Vermiculite
2011/12/31
A critical demand in environmental modeling and a desirable but elusive goal of research on the ion exchange properties of the charged solid surface has been to determine the selectivity coefficient f...
ALKALI CATION SELECTIVITY AND SURFACE CHARGE OF 2:1 CLAY MINERALS
Hard/soft acid/base model Ion exchange Isomorphic substitution Layer charge Lewis acid
2011/11/15
A critical demand in environmental modeling and a desirable but elusive goal of research on the ion exchange properties of the charged solid surface has been to determine the selectivity coefficient f...
The Thermodynamic Status of Compositionally-Variable Clay Minerals: A Discussion
Illite Montmorillonite Thermodynamic status Excess lattice energy Solubility Compositional variation
2011/12/30
According to Lippmann (1977, 1982) wide compositional variations and excess enthalpies of mixing calculated with electrostatic models imply that clay minerals of variable composition are dis-equilibri...
Origin and Diagenesis of Clay Minerals in the Monterey Formation, Santa Maria Basin Area, California
Bentonite Diagenesis Illite/Smectite Illitization Kaolinite Zeolite
2012/1/4
The clay mineralogy of the Miocene Monterey Formation was determined for onshore and offshore sequences in the Santa Maria basin area, California. The <0.1-祄 fraction of clayey, opal-CT porcelanites, ...