Mineralogical controls on mobility of rare earth elements in acid mine drainage environments

Supplementary data related to this article can be found at https://doi.org/10.1016/j.chemosphere.2018.04.095.Rare earth elements (REE) were analyzed in river waters, acid mine waters, and extracts of secondary precipitates collected in the Iberian Pyrite Belt. The obtained concentrations of the REE in river water and mine waters (acid mine drainage - AMD) were in the range of 0.57 μg/L (Lu) and 2579 μg/L (Ce), which is higher than previously reported in surface waters from the Iberian Pyrite Belt, but are comparable with previous findings from AMD worldwide. Total REE concentrations in river waters were ranged between 297 μg/L (Cobica River) and 7032 μg/L (Trimpancho River) with an average of 2468 μg/L. NASC (North American Shale Composite) normalized REE patterns for river and acid mine waters show clear convex curvatures in middle-REE (MREE) with respect to light- and heavy-REE. During the dissolution experiments of AMD-precipitates, heavy-REE and middle-REE generate the most enriched patterns in the solution. A small number of precipitates did not display MREE enrichment (an index Gdn/Lun < 1.0) in NASC normalized pattern and produced relatively lower REE concentrations in extracts. Additionally, very few samples, which mainly contained aluminum sulfates, e.g., pickeringite and alunogen, displayed light-REE enrichment relative to heavy-REE (HREE). In general, the highest retention of REE occurs in samples enriched in magnesium (epsomite or hexahydrite) and aluminum sulfates, mainly pickeringite.Financial support was provided by the Andalusian Autonomous Government Excellence Project, code P06-RNM-02167. This work was also co-funded by the European Union through the European Regional Development Fund, based on COMPETE 2020, project ICT (UID/GEO/04683/2013), reference POCI-01-0145-FEDER-007690, national funds provided by FCT. Post-Doctoral Fellowship through Erasmus Mundus SAT program and Young Scientist Research Grant (SEAS-2015−14) of the National University of Mongolia were supported for T.-O. Soyol-Erdene. The authors also appreciate the valuable comments and suggestions made by the anonymous reviewers

Mobility of rare earth elements in AMD-precipitates, Iberian Pyrite Belt (SW Spain)

Apresentação efetuada no IX Congreso Geológico de España, em Huelva, España, 2016Rare earth elements (REE) were analyzed in surface waters, acid mine waters, and extracts of the mineral precipitates from Iberian Pyrite Belt. NASC (North Atlantic Shale Composition) normalized REE patterns show clear convex curvatures in middle-REE (MREE) with respect to light- and heavy-REE. Moreover, most of the AMD-precipitates release heavy-REE (HREE) to the solution during dissolution experiment, indicating that these minerals retain HREE predominantly from the water and provide REE fractionation along the series. Concentrations of the REE in water and acid mine drainage samples were in the range of 568 ng/L and 2580 µg/L, and significantly higher than previously reported concentrations of the surface waters from the Iberian Pyrite Belt.Financial support was provided by the Andalusian Autonomous Government Excellence Project, code P06- RNM-02167. This work was also co-funded by the European Union through the European Regional Development Fund, based on COMPETE 2020, project ICT (UID/GEO/04683/2013), reference POCI-01-0145-FEDER007690, national funds provided by FCT and Young Scientist Grant (SEAS14-2015) of National University of Mongolia. Post Doctoral Fellowship was supported by Erasmus Mundus SAT program for T.-O. Soyol-Erdene.info:eu-repo/semantics/publishedVersio

Movilidad de elementos de tierras raras en precipitados de drenaje ácido de mina (Faja Piritica Ibérica, SW Spain)

Rare earth elements (REE) were analyzed in surface waters, acid mine waters, and extracts of the mineral precipitates from Iberian Pyrite Belt. NASC (North Atlantic Shale Composition) normalized REE patterns show clear convex curvatures in middle-REE (MREE) with respect to light- and heavy-REE. Moreover, most of the AMDprecipitates release heavy-REE (HREE) to the solution during dissolution experiment, indicating that these minerals retain HREE predominantly from the water and provide REE fractionation along the series. Concentrations of the REE in water and acid mine drainage samples were in the range of 568 ng/L and 2580 µg/L, and significantly higher than previously reported concentrations of the surface waters from the Iberian Pyrite Belt.Los elementos de tierras raras (REE) han sido analizados en muestras de drenaje ácido de mina (en medio generador y receptor), así como en extractos solubles de precipitados de drenaje ácido de mina, procedentes de minas y de la red fluvial de la Faja Piritica Ibérica. Los padrones normalizados de las REE (North Atlantic Shale Composition) muestran una tendencia clara de curvatura convexa para las tierras raras medias (MREE) en relación con las leves (LREE) y pesadas (HREE). Además, La mayor parte de los precipitados de drenaje ácido de mina liberan preferencialmente las tierras raras pesadas para la solución durante los ensayos de disolución., indicando una mayor capacidad para adsorber HREE, generando así un fraccionamiento de las REE al largo de las series. En este estudio, las concentraciones de REE en el drenaje ácido de mina varían en la gama de 568 ng/L y 2580 µg/L, lo que indica valores significativamente más elevados que las reportadas anteriormente para el agua superficial en la Faja Piritica Ibérica.Financial support was provided by the Andalusian Autonomous Government Excellence Project, code P06-RNM-02167. This work was also co-funded by the European Union through the European Regional Development Fund, based on COMPETE 2020, project ICT (UID/GEO/04683/2013), reference POCI-01- 0145-FEDER-007690 and national funds provided by FCTinfo:eu-repo/semantics/publishedVersio

Mobility of rare earth elements in AMD-precipitates, Iberian Pyrite Belt (SW Spain)

Apresentação efetuada no IX Congreso Geológico de España, em Huelva, España, 2016Rare earth elements (REE) were analyzed in surface waters, acid mine waters, and extracts of the mineral precipitates from Iberian Pyrite Belt. NASC (North Atlantic Shale Composition) normalized REE patterns show clear convex curvatures in middle-REE (MREE) with respect to light- and heavy-REE. Moreover, most of the AMD-precipitates release heavy-REE (HREE) to the solution during dissolution experiment, indicating that these minerals retain HREE predominantly from the water and provide REE fractionation along the series. Concentrations of the REE in water and acid mine drainage samples were in the range of 568 ng/L and 2580 µg/L, and significantly higher than previously reported concentrations of the surface waters from the Iberian Pyrite Belt.Financial support was provided by the Andalusian Autonomous Government Excellence Project, code P06- RNM-02167. This work was also co-funded by the European Union through the European Regional Development Fund, based on COMPETE 2020, project ICT (UID/GEO/04683/2013), reference POCI-01-0145-FEDER007690, national funds provided by FCT and Young Scientist Grant (SEAS14-2015) of National University of Mongolia. Post Doctoral Fellowship was supported by Erasmus Mundus SAT program for T.-O. Soyol-Erdene.info:eu-repo/semantics/publishedVersio

Trace elements and Pb isotope records in Dome C (East Antarctica) ice over the past 800,000 years

Trace elements (V, Cr, Mn, Fe, Co, Cu, Zn, As, Rb, Sr, Mo, Cd, Sb, Ba, Tl, Pb, Bi, Th and U) and Pb isotopic compositions from the EPICA (European Project for Ice Coring in Antarctica) Dome C ice core have been determined using inductively coupled plasma sector field mass spectrometry (ICP-SFMS) and thermal ionization mass spectrometry (TIMS), covering the period from ~533 kyr BP to ~800 kyr BP, respectively. Our data have enabled us to extend the previous EDC records of trace elements and Pb isotopes from the Holocene back to the Marine Isotopic Stage 20.2, ~800 kyr BP. We here discuss the EDC records of Ba, Rb, Mo, Sb, Cd, Tl, Bi and Pb isotopes. Crustal elements such as Ba and Rb show well defined variations in concentrations in relation to climatic conditions with lower values during the interglacial periods and much higher values during the coldest periods of the last eight climatic cycles. Volcanogenic Cd, Tl and Bi show a less pronounced relationship between concentrations and climatic conditions. The isotopic signatures of Pb suggest that changes in the provenance of dust reaching the East Antarctic Plateau from Potential Source Areas occurred during the interglacial periods before the MBE. Our data suggest that the main factors affecting deposition fluxes and sources of natural trace elements over Antarctica are most likely linked to a progressive coupling of the climates of Antarctica and lower latitudes over the past 800 kyr