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We analyzed the mineralogical and chemical (including rare earth element [REE]) composition of the >63, 32–63, and <32 μm grain-size fractions of clay-rich sediments from Kajjansi and Ntawo valleys, central Uganda. This was done to understand the changes that occur during the formation of clays. All fractions are dominated by kaolinite and quartz, with minor smectite, chlorite, and feldspar...
The astrophysical aspects of the evolutionary path from dust to planets have been known for a long time but it was only recently that it could be followed by astronomical observations (Hubble Space Telescope). It was also recently that the mineral and chemical properties of dust around young starsqu in different stage of stellar evolution could be determined (the Infrared Space Observatory). Dust...
Three Hercynian highly peraluminous tin-bearing granites define a sequence ranging from muscovite-biotite granite to muscovite granite. Tin-bearing quartz veins are genetically related to this sequence. Variation diagrams of most major and trace elements of granites, biotite and muscovite show fractionation trends. Least squares analysis of major elements and modelling of trace elements indicate that...
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