Lower Paleozoic black shales from Estonia, Sweden, and Russia were analyzed for major trace elements to reconstruct the provenance, tectonic setting, paleoweathering conditions of these shales. The shale is highly enriched in U, V, Mo, Pb (except samples Sweden where slightly enriched), SiO2, Fe2O3, K2O, TiO2 depleted CaO, Na2O, MnO, with respect average provenance signatures (Th/Sc versus Zr/S...

Selected Malaysian black shale sequences of the Permo-Triassic and Devonian ages that crop out in Central Belt were investigated to discuss their chemical composition, provenance, tectonic setting, weathering history. X-ray fluorescence (XRF) analysis shows BRSZ Unit 1 has elevated SiO2, TiO2, K2O contents compared Semantan Gua Musang shale. In terms trace elements, element shales. The highest ...

The electrical conductivity of mould flux with chemical constitution CaO-SiO2-Al2O3-NaO-K2O-MgO-CaF2-Cr2O3-FeO-MnO has been investigated. assessed database contains one unitary, five binary, nine ternary, four quaternary, two quinary, senary and octonary subsystems. Each constitutional component is in connection to another via some direct or indirect links. A multilayer artificial neural networ...

nezam-abad area is located in southwest of shazand (arak) which is a part of sanandaj-sirjan zone. major intrusive rocks of nezam-abad are quartz diorite and minor amount of granodiorite. leucogranitic, pegmatite dykes and quartz-tourmaline veins were intruded the quartz diorite. quartz diorites are mainly composed of plagioclase, hornblende, biotite, quartz and pyroxene as major minerals. majo...

Solid fuels, including biomass, consist of combustible, ash and water. Ash in fuel is result of reaction of minerals presented in the biomass. Minerals and other different substances which form ash got into biomass during growth. Ash is solid residue resulted from the perfect laboratory combustion of fuel. It is composed of minerals that are present in the fuel. Some species of biomass ash have...

The similarity of the fine fraction dredged freshwater sediments to natural clays stimulates valorization in a product similar expanded clay aggregates, obtained by bloating at high temperature. impact ratios between different flux elements (Fe2O3 + CaO MgO K2O Na2O) on melting behavior is quantified using thermodynamic modeling and validated with experiments. total content alkalis found be key...

Closed pore glass foams with dimensions of 60mm × 20 mm were produced using agro-industrial residues. Samples containing sodo-calcic powder (78%wt) and rice husk ash (16%wt) characterized, their technological properties investigated. The samples synthesized in a conventional muffle furnace at 750–800–850 °C. results presented for apparent density (0.24–0.29 g/cm3), compressive strength (1.5–2.3...

BaO -SiO2-Al2O3 glass ceramics containing K2O and B2O3 were prepared using conventional melting of powered batches, quenching in water and crystallization of sintered glass. XRD patterns introducehexacelsian and celsian as two major crystallized phases in sintered glass-ceramics. Presence of K2O enhances crystallization of hexacelsianin comparison withB2O3.Observations showed sintering temperat...

Twenty one jumping spider species from South Yunnan are reported, diagnosed, described and illustrated; 19 of them are described as new: Afraflacilla ballarini Cao & Li, sp. n. (♂), Agorius tortilis Cao & Li, sp. n. (♂♀), Bavia exilis Cao & Li, sp. n. (♂), Carrhotus kevinlii Cao & Li, sp. n. (♂♀), Carrhotus sarahcrewsae Cao & Li, sp. n. (♂), Chinattus wengnanensis Cao & Li, sp. n. (♂♀), Chinoph...