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• W2149257858 abstract "The chemical compositions of micas from six well-characterised sequences have been jointly evaluated in order to analyse the behaviour of illitic substitution (SiAl -1 K -1 ) in relation to diagenetic/metamorphic grade. Data from ~265 crystals, corresponding to 48 samples, were obtained through EDX analyses in SEM and TEM and the influence of analytical artefacts, such as contamination and alkali loss, was critically evaluated. From diagenesis to low epizone, the compositions of the micas are highly heterogeneous at the sample level, do not show systematic differences between grades, and include a significant illitic component, ranging from interlayer cations = 0.6 to 1.0 a.f.u. At high epizone (Kubler Index < 0.2 °2 ), a very significant textural change is accompanied by homogenisation of the chemical composition and a reduction of the illitic component to very low values. Our data suggest continuity in the composition between illite and muscovite and do not allow us to confirm the existence of a miscibility gap in low-T environment natural samples. Some of the mica analyses reaching Si contents of around 3.5 a.f.u. correspond to interlayer- cation population contents in the range of 0.6-0.7 a.f.u., indicating illitic substitution. Therefore, thermobarometry of low- temperature phengites based only on the Si-content, without taking into account the illitic component, would result in pressure overestimates. Resumen: Se evaluan de manera conjunta los datos qu´ omicos de micas correspondientes a seis secuencias bien caracterizadas previamente, con el objeto de analizar el comportamiento de la sustitucion il´ otica (SiAl-1 K-1), en relacion al grado diagenetico/ metamorfico. Se han empleado los datos qu´ omicos obtenidos mediante SEM (EDX) y TEM (AEM) de ~265 cristales pertenecientes a 48 muestras. Se ha considerado cr´oticamente la influencia de artefactos anal´ oticos tales como la contaminacion y la volatilizacion de alcalinos. Desde la diagenesis hasta la epizona debil, las muestras se caracterizan por mostrar micas composicionalmente muy heterogeneas, sin diferencias sistematicas entre grados y con un componente il´ otico significativo, con valores de interlaminares de 0.6 a 1.0 a.f.u. En la epizona intensa (´ de Kubler < 0.2 °2 ) un cambio textural importante acompana a la homogeneizacion de la composicion qu´ omica de las micas con la consiguiente reduccion del componente il´ otico a valores muy bajos. Nuestros datos sugieren continuidad en la composicion entre ilitas y moscovitas y no permiten confirmar la existencia de un hueco de miscibilidad en ambientes naturales de baja temperatura. Algunos analisis de las micas alcanzan valores de Si de 3.5 a.f.u. junto a una poblacion de interlaminares en el rango de 0.6 a 0.7 a.f.u. que indican claramente la sustitucion il´ otica. Por tanto, la termobarometr´ oa de micas feng´ oticas de baja temperatura basada solo en el contenido en Si sin tener en cuenta el componente il´ otico, podr´ oa producir una sobrevaloracion de la presion." @default.
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• W2149257858 date "2006-03-06" @default.
• W2149257858 modified "2023-10-10" @default.
• W2149257858 title "Illitic substitution in micas of very low-grade metamorphic clastic rocks" @default.
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• W2149257858 doi "https://doi.org/10.1127/0935-1221/2006/0018-0059" @default.
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