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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Kenya
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Kenya Rift valley (1)
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Primary terms
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Africa
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Spermatophyta
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ash
Pyroclastic deposits of Ubehebe Crater, Death Valley, California, USA: Ballistics, pyroclastic surges, and dry granular flows
Lithologic controls on microfracturing from legacy underground nuclear explosions
Emergence of wet conditions in the Mono Basin of the Western USA coincident with inception of the Last Glaciation
Stratigraphic and Geochemical Evidence for the Alteration of Calcareous Glauconitic Marine Sediments to Calcium Bentonite
Abstract We review here data and information on Antarctic volcanism resulting from recent tephrostratigraphic investigations on marine cores. Records include deep drill cores recovered during oceanographic expeditions: DSDP, ODP and IODP drill cores recovered during ice-based and land-based international cooperative drilling programmes DVDP 15, MSSTS-1, CIROS-1 and CIROS-2, DVDP 15, CRP-1, CRP-2/2A and CRP-3, ANDRILL-MIS and ANDRILL-SMS, and shallow gravity and piston cores recovered in the Antarctic and sub-Antarctic oceans. We report on the identification of visible volcaniclastic horizons and, in particular, of primary tephra within the marine sequences. Where available, the results of analyses carried out on these products are presented. The volcanic material identified differs in its nature, composition and emplacement mechanisms. It was derived from different sources on the Antarctic continent and was emplaced over a wide time span. Marine sediments contain a more complete record of the explosive activity from Antarctic volcanoes and are complementary to those obtained by land-based studies. This record provides important information for volcanological reconstructions including approximate intensities and magnitudes of eruptions, and their duration, age and recurrence, as well as their eruptive dynamics. In addition, characterized tephra layers represent an invaluable chronological tool essential in establishing correlations between different archives and in synchronizing climate records.
Effect of chemical stabilization on index and engineering properties of a remoulded expansive soil
Effect of cement and fly-ash on the geotechnical properties of expansive clay soils
Breadcrust bubbles: Ash particles recording post-fragmentation brittle-ductile deformation
Geochemistry of major, trace and rare earth elements in coals from the Tazareh mine, eastern Alborz coalfield, NE Iran
The influence of binders for the pelletization of fly ash zeolites on sulfur dioxide sorption properties
Analysis of tempered bricks: from raw material and additives to fired bricks for use in construction and heritage conservation
EFFECTIVE DYE REMOVAL FROM WASTE WATER USING A NOVEL LOW-COST NaOH-MODIFIED FLY ASH
SYNTHETIC ZEOLITES DERIVED FROM FLY ASH AS EFFECTIVE MINERAL SORBENTS FOR DIESEL FUEL SPILL REMEDIATION
Mineralogy of paloverde ( Parkinsonia microphylla ) tree ash from the Sonoran Desert: A combined field and laboratory study
Characterization of particulate matter in attic and settled dusts collected from two buildings in Budapest, Hungary
Abstract We have investigated two buildings covered with Zsolnay glazed architectural ceramics in Budapest (Hungary), one located in the densely built-up area of the city centre with a high traffic rate and one in a city quarter with moderate traffic and more open space. A black crust layer, containing a large amount of artificial particulate matter with different size and chemical composition, was observed on the ceramic material of both buildings, whereas weathered glaze was detected only on the ceramics of the building situated in the city centre. In this paper, our goal is to reveal the role of the particulate matter in the degradation of architectural ceramics. For this reason the attic dust and settled dust from the roofs of the studied buildings were collected. In the attic dust, besides the natural particles of geological origin, three types of artificial particles typically with spherical shape (spherules) were also distinguished: aluminosilicate (two subtypes), carbonaceous, and iron-rich fly-ash. The appearance of gypsum crystallites around the particulate matter in association with all spherule types suggests that the particulate matter greatly contributes to the degradation process.