Publication: La composición mineralógica de los sedimentos terciarios de la Cuenca del Guadiana
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2013
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Sociedad Geológica de España
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Abstract
Se ha estudiado la composición mineralógica de los depósitos terciarios de la Cuenca del Guadiana a partir del análisis mediante Difracción de rayos X de 137 muestras. Los depósitos de la Cuenca del Guadiana presentan una gran homogeneidad mineralógica al estudiar la roca total. Están formados por filosilicatos, cuarzo y feldespato en menor proporción Esta aparente homogeneidad en la sucesión terciaria desaparece al analizar la fracción <2μm, poniéndose de relieve las diferencias en el contenido en carbonatos y en las asociaciones de minerales de la arcilla que son correlacionables con las unidades litoestratigráficas definidas en la cuenca: la asociación illita(predominante)- esmectita-caolinita caracteriza la Secuencia Deposicional Inferior (SDI); la presencia de carbonatos y la asociación esmectita(predominante)- illita-caolinita caracteriza a la Secuencia Deposicional Superior (SDS); la asociación paligorskita-dolomita caracteriza la base de la Secuencia Deposicional Superior; por último, la asociación calcita-paligorskita caracteriza los niveles carbonatados a techo de la Secuencia Deposicional Superior.
The mineralogical composition of 137 samples collected from the tertiary sediments in the Guadiana Basin has been studied by X-Ray Diffractometry. The mineralogical composition for the whole-rock samples is remarkably homogeneous being rich in phyilosilicates, quartz, with minor feldspars. However, this homogeneity disappears when studying the fraction <2μm revealing large differences in clay mineral assemblages among the samples These assemblages together with the presence of some carbonates, indicate different sedimentary successions that can be correlated with the lithostratigraphic units defined in the basin: illite (predominant)-smectite-kaolinite assemblage characterizes the Lower Depositional Sequence (SDI); the presence of carbonates and smectite(predominant)-illite-kaolinite assemblage characterizes the Upper Depositional Sequence (SDS); the palygorskite-dolomite mineral assemblage characterizes the base of the Upper Depositional Sequence; finally, the assemblage calcite-palygorskite characterizes the carbonate levels located at the top of the Upper Depositional Sequence.
The mineralogical composition of 137 samples collected from the tertiary sediments in the Guadiana Basin has been studied by X-Ray Diffractometry. The mineralogical composition for the whole-rock samples is remarkably homogeneous being rich in phyilosilicates, quartz, with minor feldspars. However, this homogeneity disappears when studying the fraction <2μm revealing large differences in clay mineral assemblages among the samples These assemblages together with the presence of some carbonates, indicate different sedimentary successions that can be correlated with the lithostratigraphic units defined in the basin: illite (predominant)-smectite-kaolinite assemblage characterizes the Lower Depositional Sequence (SDI); the presence of carbonates and smectite(predominant)-illite-kaolinite assemblage characterizes the Upper Depositional Sequence (SDS); the palygorskite-dolomite mineral assemblage characterizes the base of the Upper Depositional Sequence; finally, the assemblage calcite-palygorskite characterizes the carbonate levels located at the top of the Upper Depositional Sequence.