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Chemical signature of two Permian volcanic ash deposits within a bentonite bed from Melo, Uruguay Anais da ABC (AABC)
Calarge,Liane M.; Meunier,Alain; Lanson,Bruno; Formoso,Milton L.L..
A Permian bentonite deposit at Melo, Uruguay is composed of a calcite-cemented sandstone containing clay pseudomorphs of glass shards (0-0.50 m) overlying a pink massive clay deposit (0.50-2.10m). The massive bed is composed of two layers containing quartz and smectite or pure smectite respectively. The smectite is remarkably homogeneous throughout the profile: it is a complex mixed layer composed of three layer types whose expandability with ethylene glycol (2EG 1EG or 0EG sheets in the interlayer zone which correspond to low-, medium- and high-charge layers respectively) varies with the cation saturating the interlayer zone. The smectite homogeneity through the profile is the signature of an early alteration process in a lagoonal water which was over...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bentonite; REE; Incompatible elements; Mixed-layer minerals; Uruguay.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300012
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