Abstraet--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 isotope ratios of smectite in the volcanic ash range from +6,9 to + 12.9 per mill (%o), which are comparable to the values of smectite (~lsO = +6.5 and +9.4%0) from currently active geothermal fields. ...

Interstratifications of talc and trioctahedral smectites from different provenances are used as indicators for geological environments and for geotechnical and technical applications. However, comprehensive layer characterization of these interstratifications is rare. Sample EX M 1694, a clay with red-beige appearance from the Madrid basin was studied by X-ray diffraction analysis, X-ray fluore...

-Tetramethylphosphonium-smectite (TMP-clay) and tetramethylammonium-smectite (TMAclay), were prepared and characterized as adsorbents for a series of aromatic and chlorinated hydrocarbons. The sorption of benzene, alkylbenzenes, and carbon tetrachloride as vapors and as solutes from water was studied to evaluate the effect of water on adsorption efficiency. Adsorption of organic vapors depended...

Samples of The Miraflores Basalt sub-volcanic rocks (Miocene Late Formation) collected from different quarries on the Isthmus Panama and several samples excavation third set locks in New Channel were characterised this study. All studied had similar petrological mineralogical characteristics; however, substantially degrees alteration, which varied NW–SE direction. most altered areas located at ...

A number of Cd-, Pb-, Ag- and Sb(±As)-bearing minerals are found in the Zn-rich smoker chimneys Irinovskoe hydrothermal sulfide field, 13°20′ N, Mid-Atlantic Ridge. Sulfide samples were studied using optical microscopy, SEM/EDS, XRD, EBDS, ICP-MS thermodynamic approaches. The consist major sphalerite (including Cd-bearing type with up to 41.38 wt% Cd) wurtzite, subordinate opal, pyrite, chalcop...

Magnesium aminoclays were synthesized and used to transform non-competent Escherichia coli JM109 using the exogenous plasmid pUC19. The structure determined for Mg is analogous 2:1 trioctahedral smectites such as talc, with an approximate composition R8Si8Mg6O16(OH)4, where R = CH2CH2NH2, morphologically arranged in layered sheets. employed a cationic vehicle that enabled passage of plasmids ac...

The objective of the study was to characterize clays Lama depression in Benin. Macroscopic examination hand soundings, dynamic penetration test and stratigraphic correlation water borehole logs, as well scanning electron microscopy (SEM) combined with energy-dispersive X-ray microanalysis (EDX) method were made on compact or stratified clays. large grains are embedded a sintered matrix. texture...

-X-ray diffraction patterns of oriented films of montmorillonite containing enantiomeric tris(2,2'bipyridyl) ruthenium(II) chloride (Ru(bpy)22§ show a peak corresponding to basal spacings of approximately 27 ,~. This peak is absent from the X-ray patterns of montmorillonite films containing racemic cations. A basal spacing of 27 ,~ is consistent with the adsorption of 2 layers of the enantiomer...

Glen Torridon is a topographic trough located on the slope of Aeolis Mons, Gale crater, Mars. It corresponds to what was previously referred as “clay-bearing unit”, due relatively strong spectral signatures clay minerals (mainly ferric smectites) detected from orbit. Starting in January 2019, Curiosity rover explored for more than 700 sols (Martian days). The objectives this campaign included a...

-Imeraction of water with montmorillonite exchanged with Na +, K +, Co 2+, and Cu 2+ cations as a function of water content was examined using an FTIR/gravimetric cell designed to collect spectroscopic and sorption data simultaneously. Correlation of water desorption isotherms with infrared spectra of the clay-water complex showed that the position of the HOH bending band of water decreased as ...