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ASU expert: Volcanic ash could disrupt travel for months
ASU expert Volcanic ash travel
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2010/4/29
Shutting down air travel in response to the volcanic activity in Iceland might seem drastic, but it is a measured response to the hard-to-measure threat caused by the ash plume that shot high into Ear...
Use of immobile trace elements for the correlation of Telychian bentonites on Saaremaa Island,Estonia,and mapping of volcanic ash clouds
bentonites K-bentonites Telychian correlation isopach schemes East Baltic
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2009/10/21
Thirty suspected altered volcanic ash (bentonite) samples from the Nässumaa-825 and Orissaare-859 sections were analysed by the X-ray fluorescence method. Twenty of these samples revealed chemica...
Stable Isotope Evolution of Volcanic Ash Layers during Diagenesis of the Miocene Monterey Formation, California
Bentonite Diagenesis Monterey Formation Stable Isotopes Volcanic Ash
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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
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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
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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
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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
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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
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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
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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
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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...