Monacita en suelos formados sobre pizarras del Ordovícico Centroibéricoensayo de movilidad de sus componentes

1. Pablo Higueras ¹
2. R. Jiménez-Ballesta ²
3. J.M. Esbrí ¹
4. R. García ²
5. E.M. García-Noguero ¹
6. C. García-Noguero ¹
7. R. Álvarez ³
8. J.A. Campos-Gallego ¹
9. P.M. García-Zamorano ¹

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Altres publicacions en: Geotemas (Madrid)

Resum

The present work provides data on the mobility of elements of the Rare Earths group (REE) in a red Mediterranean soil developed in the area where concentrations of monacite (phosphate of these elements and one of its two main ores) are located. These concentrations would have their origin in gray slates of Ordovician age from the Central Iberian Zone, Iberian Massif. They are constituted by millimeter-sized nodules of gray monacite, mechanically concentrated in soils, alluviums and colluviums formed on the gray slates or in their immediate surroundings. The studied monazite is poor in radioactive ele- ments commonly present in this mineral (Uranium and Thorium),. The mobility of the contained elements has been analyzed on samples of a one-meter thick soil profile, and it has been determined by selective extraction using ammonium acetate in acid condition (pH = 4.75) as extracting agent. Concentrations of REE appear much higher in the most surficial 30-40 cm of the studied soil profile, unveiling a concentration of the mentioned nodules in this sector of the soil; we have also detected a greater relative mobility of heavy rare earths and U versus light rare earths and Th.

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