Abstract Hydrothermally altered rhyolite rocks in the Permian Donnersberg Formation of a geothermal borehole Northern Upper Rhine Graben (Germany) were investigated to find out answers for low hydraulic conductivity rocks. The composition clay minerals and temperature smectite–illite transformation carried using X-ray diffraction, fluorescence, transmission electron microscopy, Fourier transfor...

Abstract Although the Mesozoic rocks of Transdanubian Range have been subject a multitude different studies, mineralogical research is largely underrepresented. The clay mineralogy Lower Jurassic (especially Pliensbachian and Toarcian) strata was broadly investigated earlier; however, systematic high-resolution studies remain scarce. Here we present study focusing on Upper Lókút-Hosszúárok sect...

Bentonite mixed soil, which is a mixture of bentonite with sand and gravel, can be easily compacted by adjusting the blending degree, it difficult for water to pass through exhibits low permeability. It widely used at construction sites because on-site has good workability. Examples its use include impermeable layers waste disposal measures contain heavy metals from rocks generated sites. The m...

The aim of this study is to investigate the oxalic acid activation bentonites containing different types smectites, analyse their surface modification as a function concentration and create good quality bleaching earths. In particular, two bentonite samples (one aluminum one ferruginous smectite), after being characterized through XRD, XRF FT-IR analysis, are treated with at 0.5, 0.7 1 M. Their...

Mineral dust supplied to remote ocean regions stimulates phytoplankton growth through delivery of micronutrients, notably iron (Fe). Although attention is usually paid to Fe (hydr)oxides as major sources of available Fe, Fe-bearing clay minerals are typically the dominant phase in mineral dust. The mineralogy and chemistry of clay minerals in dust particles, however, are largely unknown. We con...

The biogeochemistry of phyllosilicate-Fe redox cycling was studied in a Phalaris arundinacea (reed canary grass) dominated redoximorphic soil from Shovelers Sink, a small glacial depression near Madison, WI. The clay size fraction of Shovelers Sink soil accounts for 16% of the dry weight of the soil, yet contributes 74% of total Fe. The dominant mineral in the clay size fraction is mixed layer ...

The search for once-habitable locations on Mars is increasingly focused on environments dominated by fluvial and lacustrine processes, such as those investigated by the Mars Science Laboratory Curiosity rover. The availability of liquid water coupled with the potential longevity of such systems renders these localities prime targets for the future exploration of Martian biosignatures. Fluvial-l...

Montmorillonite, a 2:1 clay mineral, is known to accommodate different organic substances within its interlayer space to form intercalation compounds, which have received much attention because of their stability and physicochemical properties. Its use as a drug carrier is widely studied, as the location of the drug molecules within the interlayer space of the clay may modify the suitability of...