Primeros datos acerca de la evolución química de los Filosilicatos en el complejo Malaguide durante la fase Metamòrfica Alpina

Abstract

Compositional trends in the Maláguide Paleozoic, a very low-grade metamorphic complex of the Betlc Cordilleras, have been investigated in the Málaga area using bulk-rock mineralogy, clay mineralogy and chemical composition of phyllosilicates. Chemical trends, characterized by the general decrease on Si and Al contents, and the simultaneous increase on Fe+Mg content and Fe/(Fe+Mg) ratio. This can be interpreted in terms of boths, increasing temperatures, and differences in initial bulk chemistry. It is concluded that: (a) Most of the phyllosilicate reactions during the alpine event took place in a close system, with scarce exchanges between coarse- and fine-grained beds, (b) The general trends lead to a transition from di,trioctahedral species toward trioctahedral ones, as a function of increasing depths