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 element composition of the soil clay with the unweathered volcanic glass. The clay fractions had only 10% as much Na as the volcanic glass. Conversely, the rare earth element concentrations were about t...

We show that 85% of variation in total organic carbon can be explained by mineral surface area in a black shale deposit from two locations in the late Cretaceous Western Interior Seaway, United States. This relation suggests that, as in modern marine sediments, adsorption of carbon compounds onto clay mineral surfaces played a fundamental role in the burial and preservation of organic carbon. O...

Different compositions of mixtures sand and clay with medium-grade bentonite for molding critical large parts a freight car bogie are examined in the article. to improve bentonite’s physical mechanical properties, such as gas permeability compressive strength addition soda ash, considered. As material study were taken quartz grade 1K2O2025, medium Navbaharskogo birthplace, improving properties ...

The oldest sediment most recently recovered from the Arctic Ocean is a biosiliceous ooze nearly devoid of nonbiogenic particles and exhibiting small-scale color changes. Color variations are due to changes in iron and manganese content. These elements are probably of local hydrothermal origin, and the Mn precipitation may be bacteria-mediated. An iron silicate phase seems to form at the expense...

The effects of geological conditionwere assessed on density of Soil Organic Carbon (SOC) and Nitrogen (N)in a sequence of hillslope landscape, derived from different lithology i.e. loess deposit, reworked loess, marl with mixed siltstone and shale, reddish brown clay deposits and older loess in the semiarid area of northern Iran. However, other factors can influence SOC and N density such as la...

Finite difference method (FDM) has been adapted herein to analyze the performance of fully saturated clay barrier by using 1-D contaminant transport model to predict migration of two typical contaminant species, namely, sodium and chloride from the leachate of municipal waste landfill. The constructed clay liner media compacted in different lifts or the natural clay deposit beneath the landfill...