Abstract
En este trabajo se investiga la distribución de tierras raras (REE), elementos críticos de interés económico, en minerales accesorios de Pizarras Ordovícicas del Sinclinal de Truchas (Fm. Luarca, Zona Centro-Ibérica, León). Estas pizarras están formadas por cuarzo, moscovita y clorita (± albita) y minerales accesorios diversos: monacita (en parte sin-metamórfica), xenotima, allanita, zircón, apatito, óxidos (rutilo y magnetita) y sulfuros (pirita-pirrotina, calcopirita, galena, esfalerita y pentlandita). Se han realizado regresiones lineales múltiples entre la composición media de REE de las pizarras y de diferentes minerales accesorios de la literatura. Los resultados muestran que la combinación de monacita y xenotima, con abundancias modales de 0.046% y 0.013% respectivamente, explica satisfactoriamente los patrones de REE en roca total, de acuerdo con las observaciones de microscopia electrónica de barrido. Estos resultados permiten conocer el control mineralógico de la geoquímica de REE en estas pizarras Ordovícicas. Adicionalmente, la observación de monacita sin metamórfica es importante para futuros estudios geocronológicos.
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-Ibe-rian 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-pyrrhoti-ne, 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 litera-ture. The results show that the combination of monazite and xeno-time, with modal abundances of 0.046% and 0.013%, respectively, satisfactorily explains the REE patterns of the whole rock, in agree-ment with the scanning electron microscope observations. These re-sults 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
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-Ibe-rian 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-pyrrhoti-ne, 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 litera-ture. The results show that the combination of monazite and xeno-time, with modal abundances of 0.046% and 0.013%, respectively, satisfactorily explains the REE patterns of the whole rock, in agree-ment with the scanning electron microscope observations. These re-sults 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
| Translated title of the contribution | Influence of accessory minerals on rare earth elements in Ordovician slates (Fm. Luarca, Truchas Syncline, León, Spain): nfluence of accessory minerals on rare earth elements in Ordovician slates (Fm. Luarca, Truchas Syncline, León, Spain) |
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| Original language | Spanish |
| Pages (from-to) | 39-42 |
| Number of pages | 4 |
| Journal | Geogaceta |
| Volume | 74 |
| DOIs | |
| Publication status | Published - Jul 2023 |
| Externally published | Yes |