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handle: 10261/32279
[ES] Se dan datos sobre los parámetros químicos y estructurales, medidos mediante difracción de rayos X, de cloritas metapelíticas correspondientes a un metamorfismo de grado bajo y de retrometamorfismo. También se presentan análisis por microsonda electrónica de cloritas de meta-basitas, correspondientes a las facies de esquistos verdes y anfibolitas en sentido lato. En ambos casos se estudian las diferencias de composición entre las cloritas de distintas unidades geológicas y se relaciona la composición de la clorita con la de su correspondiente roca de caja. Tanto en las metapelitas como en las metabasitas, se ha llegado a la conclusión de que la composición química de la clorita se encuentra determinada fundamentalmente por la composición química de la roca en que se ha formado. No obstante, la temperatura de formación se revela como un segundo factor determinante de la composición química, formándose cloritas tanto más magnésicas cuanto más alta es la temperatura.
[EN] Data about chemical and structural parameters, measured by X-ray diffraction, of metapelitic chlorites belonging to a low grade and retrograde metamorphism are given. Microprobe analyses of metabasite chlorites, from the greenschists and amphibolites facies (s.l.) are also shown. In both cases the differences in composition between the chlorites of several geological units are discussed and the chemical composition of the chlorites is related to that of their corresponding host rocks. In all cases, it has been obtained that the chemical composition of the samples is essentially determinated by the chemical composition of the host rock. However, the formation temperature is a second determining facto of the chemical composition, chlorites became more magnesium rich with an increase in the temperature, reached in the formation.
9 páginas, 9 figuras, 8 tablas
Peer reviewed
Cloritas, Betic Cordilleres, Cordilleras Béticas, Chloritas
Cloritas, Betic Cordilleres, Cordilleras Béticas, Chloritas
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