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Stable Isotope Evolution of Volcanic Ash Layers during Diagenesis of the Miocene Monterey Formation, California
Bentonite Diagenesis Monterey Formation Stable Isotopes Volcanic Ash
2011/12/2
Abstract: The oxygen and hydrogen isotope compositions of volcanic ash layers from coastal outcrops of the Miocene Monterey Formation elucidate the progressive burial diagenesis of glass to bentonite ...
Hydrothermal Origin of Smectite in Volcanic Ash
Hydrothermal Alteration Oxygen Isotope Composition Smectite Volcanic Ash
2011/12/8
Abstract: Smectite and fine-grained quartz were separated from 6 volcanic ash samples collected in Japan from Shinmoe-dake Volcano, southern Kyushu, and Mt. Usu Volcano, southern Hokkaido. Oxygen isot...
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...
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...
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...