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Oxygen Isotope Changes during Mica Alteration
Mica Oxygen isotopes Potassium Recrystallization Saponite Weathering
2012/2/1
Oxygen isotope analyses (δO18) of micas that were artificially depleted in K+ indicate little or no isotope exchange during the transformation. The oxidation of iron in K-depleted, iron-rich micas by ...
Development of Layer Charge and Kinetics of Experimental Smectite Alteration
Alteration Hydrothermal Illite Layer charge Nuclear waste repository Smectite
2012/1/13
Sodium-saturated Wyoming bentonite was hydrothermally reacted at 150亱 and 250亱C for 30 to 180 days to determine smectite alteration rates that might be applied to nuclear-waste repository design. Na-C...
Further Investigations of a Conversion Series of Dioctahedral Mica/Smectites in the Shinzan Hydrothermal Alteration Area, Northeast Japan
Burial diagenesis Interstratification K-fixation Mica Rectorite • Smectite
2012/2/7
A complete conversion series for mica/smectites was found in a hydrothermal alteration envelope around Kuroko-type ore deposits at the Shinzan area, Akita Prefecture, Northeast Japan. The minerals are...
Alteration of Clay Minerals and Zeolites in Hydrothermal Brines
Backfill Bentonite Cesium Clinoptilolite Hydrothermal Mordenite Salt repository Smectire Strontium Vermiculite Zeolite
2012/2/7
Clay minerals and zeolites, candidate backfill minerals for nuclear waste repositories, were treated with saturated NaCl brine and Mg-rich (Mg-Ca-Na-K) brine at 200∑C and 300∑C for 4 weeks under a con...
Alteration of Andesite in Wet, Unstable Soils of Oregon's Western Cascades
Andesite Halloysite Scanning electron microscopy Smectite Soil Weathering
2012/2/7
Alteration products of andesite cobbles from wet soils formed in volcanic colluvial material were studied using petrographic, electron microscope, X-ray powder diffraction, and thermal techniques. Aug...
Hydrothermal Alteration of a Serpentinite Near Takovo, Yugoslavia, to Chromium-Bearing Illite/Smectite, Kaolinite, Tosudite, and Halloysite
Cr-halloysite Cr-illite/smectite Cr-kaolinite Cr-tosudite Hydrothermal Serpentinite
2012/2/9
Hydrothermal alteration products of serpentinite near Takovo, Yugoslavia, were studied by X-ray powder diffraction and chemical analysis. A zone of mainly blue clays adjacent to the hydrothermal vein ...
Biotite Alteration in Deeply Weathered Granite. II. The Oriented Growth of Secondary Minerals
Biotite Electron diffraction Goethite Orientation Vermiculite Weathering products
2012/2/10
Single grain X-ray and electron diffraction patterns of weathered biotite flakes exhibit groupings of 001 and hk reflections of biotite, vermiculite, mixed-layer clay minerals, and kaolinite indicatin...
Biotite Alteration in Deeply Weathered Granite. I. Morphological, Mineralogical, and Chemical Properties
Biotite Goethite Mixed-layer mineral SEM morphology Vermiculite Weathering
2012/2/10
Biotite in deeply weathered granitic rocks in southwestern Australia has altered to exfoliated grains composed of biotite, mixed-layer clay minerals, kaolinite, vermiculite, gibbsite, goethite, and he...
Cristobalite Morphology and Oxygen Isotopic Composition Variation under Hydrothermal Alteration
Cristobalite Morphology Oxygen Isotopic Composition Variation Hydrothermal Alteration
2011/11/18
Abstract: From 2 to 28% opal-cristobalite was isolated from the 2–20 µm fraction of rhyolitic and andesitic tuffaceous pyroclastics from the Island of Honshu, Japan, where it had been formed in ...
Experimental Alteration of a Chlorite into a Regularly Interstratified Chlorite-Vermiculite by Chemical Oxidation
Chlorite Chlorite-Vermiculite Chemical Oxidation
2012/2/13
A IIb orthochlorite (brunsvigite), from the chloritic metabasalt in the Middletown Valley of Maryland, was altered to a regularly interstratified chlorite—vermiculite after four months reaction in sat...
Natural Alteration of Mica and Reactions between Released Ions in Mineral Deposits
Natural Alteration Mica Released Ions Mineral Deposits
2012/2/14
Chemical changes during the natural alteration of micas were studied by electron microprobe and classical chemical analyses of fresh and altered portions of mica flakes from 10 Canadian mineral deposi...
Artificial Alteration of Biotite into a 14 A Layer Silicate with Hydroxy-Aluminium Interlayers
Artificial Alteration Biotite 14 A Layer Silicate Hydroxy-Aluminium Interlayers
2012/2/15
Biotite was altered by boiling in 0·2 M AlCl3 solution, and the products were examined by X-ray powder and single-crystal diffraction, chemical analysis and thermogravimetry. The altered material is a...
The Alteration of Some Aromatic Amino Acids and Polyhydric Phenols by Clay Minerals
Aromatic Amino Acids Alteration Polyhydric Phenols Clay Minerals
2012/2/15
These studies concern the catalytic activity of clays on amino acids, particularly tyrosine. Polyhydric phenols were included to help understand the tyrosine reactions.Below pH 3, tyrosine is adsorbed...
The Alteration Products of Potassium Depleted Oxybiotite
Alteration Products Potassium Oxybiotite
2012/2/15
Artificial weathering of biotites, which contain various levels of structural ferric iron, by NaCl and NaBPh4 solutions produces minerals and structures similar to those described for naturally weathe...
Artificial alteration of thirty-five trioctahedral and one dioctahedral micas by solutions varying in strength from 0·001 to 1·00 molal magnesium sulfate was found to approximate a normal exchange rea...