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The stratigraphic sequence of El Rinconcillo belong to the Algeciras Unit. Illite, kaolinite, chlorite and interstratified illite-smectite are common minerals for materials of this Unit, but a high proportion of Fe-Al smectites and sporadic presence of palygorskite is characteristic of the series of El Rinconcillo in relation to the others studied in Northern Africa and Southwestern Spain. Illite, kaolinite and chlorite are considered to be inherited minerals. Smectides and interestratified illite-smectite are also inherited in the turbidites but they were formed in the source area by transformation from illite under different weathering degree. Finally, the formation of palygorskite in the Middle Eocene carbonatic turbidites accompanied by many smectide, and no kaolinite, is difficult to explain in relation with turbiditic materials. It is more feasible to suppose a removal process that implicates the existence of a previous clay sediment in which such association -palygorskite + smectite- took place by transformation and/or by neoformation.

Mineralogía y génesis de la fracción fina de la serie de El Rinconcillo (formaciones Flysch del Campo de Gibraltar. SW de España)