Abstract
According to lithological composition three units were stablished in the area studied: a) Clayey unit. Green and pinkish clays with sandy beds and early formation of calcretes. Clay minerals association: smectite-mixed-layers (kerolite-stevensite) sepiolite-illite-kaolinite. b) Clayey calcareous unit Green clays with calcretes and a sandy level at bottom of the unit. Clay minerals association: smectite-illite-palygorskite-sepiolite-kaolinite. c) Clayey-dolomitic unit. Green clays with dolomicrites. Clay minerals association: smectiteillite-palygorskite-sepiolite. Results let us to stablish a sepiolite and palygorskite genesis related to lacustrine paludine environments where pedodiagenetic processes (v.s. carbonation, dolomitization, silicification, vertic features) were responsible of smectite instability, with development of palygorskite or sepiolite, according to their respectively di or triocthedral character.
Highlights
En el área estudiada, desde un punto de vista litológico se han diferenciado tres tramos: a) Lutítico
According to lithological composition three units were stablished in the area studied: a) Clayey unit
Clay minerals association: smectite-mixed-layers-sepiolite-illite-kaolinite. b) Clayey calcareous unit Green clays with calcretes and a sandy level at bottom of the unit
Summary
El presente estudio se ha llevado a cabo en afloramientos de la "Unidad Intermedia del Mioceno», situados entre las poblaciones de Esquivias y Borox (provincia de Toledo). A 31-1O).-Con una potencia de 4,25 metros, se caracteriza por la alternancia de lutitas verdes y rosáceas con intercalaciones samíticas y desarrollo variable de ca\cretas. 38, 30-0 a 3-11).-Con una potencia de 2,40 metros se caracteriza por la alternancia de niveles lutíticos verdosos y calcretas con grados de compacidad variables. El nivel basal de este tramo es de carácter samítico evolucionando a techo a niveles lutíticos con disyunciones columnares y
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