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Correlation between crystallochemical parameters of phyllosilicates and mineral facies in very low-grade metasediments of the Betic Cordilleras, Spain: a synthesis

Published online by Cambridge University Press:  09 July 2018

M. D. Ruiz Cruz  and
P. Rodríguez Jiménez
M. D. Ruiz Cruz*
Affiliation:
Departamento de Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
P. Rodríguez Jiménez
Affiliation:
Departamento de Química Inorgánica, Cristalografía y Mineralogía, Facultad de Ciencias, Universidad de Málaga, 29071 Málaga, Spain
*
*E-mail: mdruiz@uma.es
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Abstract

Clay mineral evolution in diagenetic and very low-grade metamorphic sedimentary rocks from the Maláguide Complex was studied using the following parameters: illite and chlorite crystallinity, b cell dimension of illite, chemistry of chlorite, and the occurrence and distribution of the following phyllosilicates: I-S mixed-layer minerals, kaolin polytypes, chlorite-bearing mixedlayer minerals (tosudite and mica-chlorite interstratifications), vermiculite-like minerals, paragonite and biotite. The distribution of IC values permits the subdivision of the study area into three zones: diagenetic, anchizone and epizone. On the contrary, the distribution of CC values cannot be used in the study of the metamorphic zonation. The mineralogy and b dimension of illite indicate that the Maláguide samples display a low to low-medium pressure metamorphism, also characterized by steep temperature gradients.

The correlation between IC data and distribution of other significant minerals has permitted the establishment of a zonation within the chlorite zone, which is confirmed by the appearance of some index minerals, such as paragonite, biotite, chloritoid and andalusite.

Keywords

Alpine metamorphismBetic Cordilleraschlorite crystallinityillite crystallinityindex mineralkaolin mineralsmixed-layer mineralsvermiculite
Type
Research Article
Information
Clay Minerals , Volume 37 , Issue 1 , March 2002 , pp. 169 - 185
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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