Caracterización geoquímica de la esméctica en varias formaciones arcillosas de los flyschs del Campo de Gibraltar (Cádiz, España)
DOI:
https://doi.org/10.3989/egeol.93495-6356Keywords:
Aljibe basal series, blocky clays, Campo de Gibraltar flyschs, Jimena clays, kaolinite, illite, smectite, trace elementoAbstract
The «Jimena clays», «basal series of Aljibe» and «blocky clays» formations are compared from the mineralogical and geochemical analysis. The mineralogy of clays is very similar in all the sequences analyzed and consists of quartz, smectite, illite and kaolinite. Smaller amounts of feldspar, gypsum and chlorite are locally presento In the 2-20 μm and < 2 μm size-fractions smectite is the most abundant mineral. The mineralogical similarity is also manifested on the chemical composition of these materials. Smectite compositions correspond to montmorillonite suggesting, along the trace element content that these smectites are weathearing products of acidic magmatic and sedimentary rocks. The homogeneity of the analyzed sequences indicates an homology in these formations and a great uniformity in the supplies during the Cretaceous-Eocene times.
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