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- W836001460 abstract "Two differently heated and loaded bentonite layers, one of Miocenic age from central Sardinia, and one of Ordovician age from southern Gotland, Sweden, have been investigated with respect to mineralogy, granulometry, microstructure and physical properties. The Sardinian bentonite bed, which is located below rhyolite rock presumably originating from magma outflow, is estimated to have been heated to 80-200oC. The tests show that the smectite content of the entire profile was only insignificantly changed by the heat pulse but cementation occurred in the cooling phase by precipitation of heat-released silica. The 0.3 m bentonite bed on Gotland been expoeed to 30 MPa pressure and 110 to 120° С for several million years. The content of smectite is around 25% of the bulk material. Illite, which is the major clay mineral, was neoformed in the voids of the smectite mass and may not be a mixed-layer component. Both clays offer good examples of smectite longevity and can be used for checking current mineral alteration models." @default.
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- W836001460 date "1988-01-01" @default.
- W836001460 modified "2023-09-24" @default.
- W836001460 title "Geological evidence of smectite longevity" @default.
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