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Beidellite in E Horizons of Northern Idaho Spodosols Formed in Volcanic Ash
Northern Idaho Podzolization Smectite Soil genesis Tephra
2011/12/28
While soils formed in tephra are typically dominated by poorly crystalline clay minerals, the occurrence of smectite in E horizons of podzolized soils (Spodosols) has been well-documented. We have obs...
Microfabric of Altered Ash Layers, ODP LEG 131, Nankai Trough
Accretionary prism Alteration Ash Microfabric Nankai Trough Physical properties Porosity
2011/12/29
Samples of ash layers and associated background sediments from Site 808 of ODP Leg 131 in the Nankai Trough accretionary prism were analyzed for changes in mineralogy, porosity and microfabric associa...
Diagenetic Alteration of Silicic Ash in Searles Lake, California
Alkaline Saline lake Anacime Clinoptilolite Diagenesis K-feldspar Merlinoite Phillipsite Volcanic ash Zeolite
2012/1/11
Ash layers from Searles Lake, California, were sampled in core of drill hole KM-3, which penetrated 693 m of lacustrine sediment deposited in a playa-lake complex over the past 3.2 my. Lake water chan...
Curved Smectite in Soils from Volcanic Ash in Kenya and Tanzania: A Low-Angle X-ray Powder Diffraction Study
Curved layers Kaolinite Low-angle X-ray powder diffraction Smectite Soil clay Relative humidity Volcanic ash
2012/1/13
Low-angle X-ray powder diffraction (XRD) measurements of soil samples, made at controlled relative humidities, showed the presence of major reflections at 20–33, 10–27, and 7–8 Å. The first refl...
Textural Variation and Composition of Bentonite Derived from Basaltic Ash
Basaltic ash Bentonite Chemical composition Hyaloclast Petrography Scanning electron microscopy Texture
2012/1/12
The Rokle bentonite deposit is part of an accumulation of argillized volcanoclastic rocks in the Tertiary stratovolcanic complex of the Doupovsk?Mountains east of Karlovy Vary (Carlsbad), about 100 km...
Laminar Opaline Silica from Some Volcanic Ash Soils in New Zealand
Andosols Opaline silica Volcanic ash soils Weathering
2011/11/22
Laminar Opaline Silica from Some Volcanic Ash Soils in New Zealand.
Identification and Structure of Two Types of Allophane from Volcanic Ash Soils and Tephra
Allophane Deuterium exchange Halloysite Imogolite Infrared spectroscopy
2012/2/9
Samples containing allophane with molar Al/Si ratios from 1.0 to 2.0 have been examined by infrared spectroscopy, X-ray fluorescence, and phosphate adsorption methods. The infrared spectra of allophan...
Effect of Chemical Pretreatment on X-ray Powder Diffraction Characteristics of Clay Minerals Derived from Volcanic Ash
Amorphous Chemical treatment Soil clay Vermiculite Volcanic ash Weathering X-ray powder diffraction
2012/2/9
The effects of NaOAc removal of carbonates, H2O2 removal of organic materials, and sodium citrate-bicarbonate-dithionite (SCBD) removal of iron oxides upon the X-ray powder diffraction (XRD) character...
Trace Element Concentration in Amorphous Clays of Volcanic Ash Soils in Oregon
Trace Element Concentration Amorphous Clays Volcanic Ash Soils
2012/2/20
Clay fractions in soils from a transect of the Mazama ash deposit (6600-yr-old) contained more than 80% amorphous material. Instrumental neutron activation analysis was used to compare the trace eleme...