Abstract Background The geochemical studies on the rare earth elements to demonstrate sources of toxic metals for soils and Nile sediments Aswan area are seldom. Results Minerallogically, studied soil agriculture samples consist mainly quartz (42%), clay minerals (33%), plagioclase (20%) magnesin-calcite (5%). Clay composed montmorillonite as bentonite. (75%), (15%), (5%) calcite calcian-montmo...

Extensive regions of yellow and white (“bleached”) sandstones within the terrestrial Jurassic red bed deposits Colorado Plateau reflect widespread interaction with subsurface reduced fluids which resulted in dissolution iron-oxide grain coatings. Reduced such as hydrocarbons, CO2, organic acids have been proposed bleaching agents. In this study, we characterize an altered section Slick Rock mem...

Nano-encapsulated iron oxide in Zirconium oxide-coated mica pigments are thermally stable,innocuous to human health, non-combustible, and they do not conduct electricity. They could beapplied in several industries such as thermoplastics, cosmetics, food packaging, children toys, paints,automobiles coating, security purposes, and banknotes. Nowadays, they are highly desirable inceramic decoratio...

Carbonates from the impact melt-bearing breccia in 2016 IODP/ICDP Expedition 364 drill core at Site M0077 were systematically documented and characterized petrographically geochemically. Calcite, only carbonate mineral present, is abundant throughout this deposit as five distinct varieties: (1) subangular clasts (Type A); (2) subround/irregular with clay altered rims B); (3) fine-crystalline ma...

The substrate effect of mica and hematite on the nucleation and crystallization of calcite was investigated using scanning electron microscope (SEM), X-ray diffraction (XRD), and electron backscatter diffraction (EBSD) methods. On mica, we found, in the absence of Mg2+, the substrates’ (001) surfaces with hexagonal and pseudo-hexagonal two-dimensional (2-D) structure can affect the orientation ...

I N T R O D U C T I O N The study of the ease with which clay minerals are decomposed by acids can provide useful information about the properties of clays. Many of the earlier studies in this field, reported by Nutting (1943) and Grim (1953), were carried out under rather severe conditions when compared to the natural weathering environment. Investigations of the reactions of clays with strong...

Through the production and export of their calcite coccoliths, coccolithophores form a key component of the global carbon cycle. Despite this key role, very little is known about the biogeochemical role of different coccolithophore species in terms of calcite production, and how these species will respond to future climate change and ocean acidification. Here, we present the first study to esti...

Batch sorption isotherms of 1,3,5-trichlorobenzene, 1,3,5-trinitrobenzene, and tetracycline to organic-free montmorillonites and soils receiving heat treatment (375°C for 24 h) were compared with those to unheated sorbents. Sorption of the nonpolar 1,3,5-trichlorobenzene to soil was lowered after the removal of humus by heating, consistent with the mechanism of hydrophobic partition into organi...