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- W2035863447 abstract "A profile studied within Holocene salt lake deposits of the Taoudenni-Agorgott basin, northern Mali, comprises a macroscopically unstratified surface layer containing calcium sulfate minerals. This interval has previously been interpreted as a depositional unit that formed under different conditions than the underlying glauberite-bearing layered deposits. The present micromorphological study of this layer demonstrates that it formed by an alteration of the glauberite-bearing primary deposits. The first stage in the alteration of the syndepositional salts was the incongruent dissolution of glauberite (Na2Ca(SO4)2). This resulted in the formation of gypsum (CaSO4·2H2O), both as crystals that are part of microcrystalline aggregates with a xenotopic fabric and as larger anhedral and elongated prismatic crystals. The gypsum crystals were subsequently subjected to a dehydration, resulting in a topotactic replacement of this mineral by bassanite (2CaSO4·H2O) and anhydrite (CaSO4). This replacement was characterized by a parallelism between the fibre axes of the dehydrated mineral phases and the [001] axis of the gypsum crystals. During later periods, the alteration products repeatedly underwent hydration and dehydration reactions and interactions with both more concentrated and dilute solutions, producing aggregates with gypsum, bassanite, anhydrite and secondary glauberite as constituents. Aggregates of acicular crystals with a possible eugsterite (Na4Ca(SO4(3·2H2O) composition also formed during this stage. In the part of the surface layer in which the alteration is most advanced, the evaporite minerals mainly occur in the form of large anhydrite nodules. The constituents of these aggregates are not exclusively the direct product of a dehydration of the large gypsum crystals from which the nodules were derived. The products of these different stages in the alteration of the primary deposits occur in separate depth intervals of the surface layer, which therefore displays a general upward increase in degree of diagenesis." @default.
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- W2035863447 date "1998-05-01" @default.
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- W2035863447 title "The alteration of glauberite in lacustrine deposits of the Taoudenni-Agorgott basin, northern Mali" @default.
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- W2035863447 doi "https://doi.org/10.1016/s0037-0738(98)00042-6" @default.
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