Martínez Frías, JesúsLunar Hernández, María Del RosarioBenito, R.2025-12-112025-12-112004Martinez-Frias, Jesus, et al. «Th- and U-Bearing Minerals in the SE Mediterranean Margin of Spain». Episodes, vol. 27, n.º 1, marzo de 2004, pp. 33-38. DOI.org (Crossref), https://doi.org/10.18814/epiiugs/2004/v27i1/004.0705-379710.18814/epiiugs/2004/v27i1/004https://hdl.handle.net/20.500.14352/128808Spanish/German NATO Collaborative Research GrantThis paper presents the first specific study of the Th- and U-bearing minerals, which were recently found in the SE Mediterranean margin of Spain (El Hoyazo area, Almería province). These minerals are REE phosphates (mainly monazite) which occur as amoeboidal-to-elongate inclusions, from around 10 µm to 120 µm, hosted in single garnet crystals from dacite lavas and metamorphic rocks from the El Hoyazo Volcanic Complex. Th and U contents are higher than 1 wt%, with 3.04 to 5.62 wt % for ThO2, and 0.7 to 1.75 wt% for UO2. Both elements are also found in xenotime (ThO2: 0.24, UO2: 0.27 wt%). Given that the erosion of the volcanic source rocks has generated a "placer-type" deposit of monazite sands and that garnets (main carriers of monazite) are being commercialised, an environmental monitoring and management plan should be urgently executed in the area.engjournal article2586-1298https://doi.org/10.18814/epiiugs/2004/v27i1/004https://www.episodes.org/journal/view.html?volume=27&number=1&spage=33&vmd=Fullopen access549(460.358)Mineralogía (Geología)2506.11 Mineralogía