Swelling capacity of mixed talc-like/stevensite layers in white/green clay infillings (“deweylite”/ “garnierite”) from serpentine veins of faulted peridotites, New Caledonia
Résumé
White (Mg-rich) and green (Ni-rich) clay infillings ('deweylite'/'garnierite') found in serpentine veins of faulted peridotite formations from New Caledonia consist of an intimate mixture of fine-grained and poorly ordered 1:1 and 2:1 layer silicates, commonly referred to as non-expandable serpentine-like (SL) and talc-like (TL) minerals. New data on the swelling and shrinking capacity of these layer silicates were gathered from X-ray diffraction (XRD) after saturation of the clay fractions with different cations (Ca 2+ , Li + , K +), ethylene glycol (EG) solvation, and heating treatments. Simultaneously, layer charge distribution and vacancy density respectively were investigated by FTIR spectroscopy on NH4-saturated clay fractions
Domaines
Sciences de la Terre
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