Procesos diagenéticos en las arcillas de la región de
La Sagra (Cuenca del Tajo)
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1988
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Instituto Geológico y Minero de España (Madrid)
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Abstract
El objetivo de este trabajo es la caracterización mineralógica y geoquímica de las arcillas de la denominada «Formación Arcillas Rojas de La Sagra», localizada en el sector sur de la Cuenca del Tajo. Se han estudiado muestras de esta formación en superficie y en sondeos, así como de los materiales que, aparentemente, constituyen cambios laterales de la misma. Los resultados obtenidos muestran una composición mineralógica caracterizada· por la predominancia de ilita, con esmectita, clorita y paligorskita como minerales acompañantes. Tanto mineralógica como químicamente, las arcillas de La Sagra son muy diferentes en composición a las formaciones más detríticas, con las que presenta aparente continuidad lateral. Las principales conclusiones del estudio se refieren a la existencia de procesos de transformación en la diagénesis temprana, así como a probables variaciones del área fuente, relacionadas con la actividad tectónica, como causas de las diferencias mencionadas.
The purpose of this work is to characterize mineralogically and geochemically the clays of the so called «Red Clays formation from La Sagra» located in the southern part of the Tajo Bassin. Samples of this formation in surface and in drilling as well as of the materials that apparently originate lateral changes in the formation, have been studied. The obtained results show a mineralogical composition characterized by the predomination of illite with smectite, clorite and paligorskite as accompanying minerals. As well mineralogically as chemically the clays from «La Sagra» show a very different composition from the most detritical formations with which they apparently show lateral continuity. The main conclusions of the research refer to the e:kistence of transformation processes in the early diagenesis, as well as to probable variations of source rock, related with the tectonic activity as causes of the mentioned differences.
The purpose of this work is to characterize mineralogically and geochemically the clays of the so called «Red Clays formation from La Sagra» located in the southern part of the Tajo Bassin. Samples of this formation in surface and in drilling as well as of the materials that apparently originate lateral changes in the formation, have been studied. The obtained results show a mineralogical composition characterized by the predomination of illite with smectite, clorite and paligorskite as accompanying minerals. As well mineralogically as chemically the clays from «La Sagra» show a very different composition from the most detritical formations with which they apparently show lateral continuity. The main conclusions of the research refer to the e:kistence of transformation processes in the early diagenesis, as well as to probable variations of source rock, related with the tectonic activity as causes of the mentioned differences.