Las margas “Tegulinas” del Prebético de Alicante. Primeras precisiones aportadas por su composición mineralógica
ISSN: 0210-6558
Year of publication: 1991
Volume: 14
Issue: 0
Pages: 223-230
Type: Article
More publications in: Boletín de la Sociedad Española de Mineralogía
Abstract
First data about bulk and clay mineralogy of mid-cretaceous clayey sediments (“tegulinas”) of the Internal Prebetic are presented. These materials contain 25%-50% of phyllosilicates (smectites, illite, kaolinite, random illite-smectite and lesser quantities of palygorskite), 5%-30% quartz, 20-65% calcite, <10% of felspars, dolomite and gypsum. Severals facts such as the clear detritic origin of clay minerals, the vertical variation of their proportion along the sequence and the degree of crystallinity of smectites and illite lead us to distinguish four cicles which represent climatic and tectonic changes in the cretaceous paleocontinent.