Influence of accessory minerals on rare earth elements in Ordovician slates (Fm. Luarca, Truchas Syncline, León, Spain)
DOI:
https://doi.org/10.55407/geogaceta98044Keywords:
rare earth elements, monazite, allanite, xenotime, Truchas SynclineAbstract
This work investigates the distribution of rare earth elements (REE), critical elements of economic interest, in accessory minerals of Ordovician slates of the Truchas Syncline (Luarca Fm., Central-Iberian Zone, León). The mineralogy of these shales consists of quartz, muscovite and chlorite (± albite) and various accessory minerals: monazite (partly syn metamorphic), xenotime, allanite, zircon, apatite, oxides (rutile and magnetite) and sulfides (pyrite pyrrhotine, chalcopyrite, galena, sphalerite and pentlandite). Multiple linear regressions were performed between the average REE composition of the studied slates and different accessory minerals from the literature. The results show that the combination of monazite and xenotime, with modal abundances of 0.046% and 0.013%, respectively, satisfactorily explains the REE patterns of the whole rock, in agreement with the scanning electron microscope observations. These results improve the understanding of the mineralogical control of REE geochemistry in these Ordovician slates. In addition, the reporting of sin-metamorphic monazite is of interest due to its geochronology potential.
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Copyright (c) 2023 Fernando Gómez Fernández, Pablo Caldevilla, Luis González-Menéndez, Ignacio González-Álvarez, Alba Lozano, Porfirio García de Arriba
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