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dc.contributor.authorBeard, Charles D.
dc.contributor.authorGoodenough, Kathryn M.
dc.contributor.authorBorst, Anouk M.
dc.contributor.authorWall, Frances
dc.contributor.authorSiegfried, Pete R.
dc.contributor.authorDeady, Eimear A.
dc.contributor.authorPohl, Claudia
dc.contributor.authorHutchison, William
dc.contributor.authorFinch, Adrian A.
dc.contributor.authorWalter, Benjamin F.
dc.contributor.authorElliott, Holly A.L.
dc.contributor.authorBrauch, Klaus
dc.date.accessioned2022-08-09T14:30:10Z
dc.date.available2022-08-09T14:30:10Z
dc.date.issued2022-06-24
dc.identifier.citationBeard , C D , Goodenough , K M , Borst , A M , Wall , F , Siegfried , P R , Deady , E A , Pohl , C , Hutchison , W , Finch , A A , Walter , B F , Elliott , H A L & Brauch , K 2022 , ' Alkaline-silicate REE-HFSE systems ' , Economic Geology , vol. First Online . https://doi.org/10.5382/econgeo.4956en
dc.identifier.issn0361-0128
dc.identifier.otherPURE: 280793921
dc.identifier.otherPURE UUID: 2d69c4ca-225f-4b3f-b9f1-d8c80142f53a
dc.identifier.otherJisc: 434536
dc.identifier.otherORCID: /0000-0002-3689-1517/work/117211248
dc.identifier.urihttp://hdl.handle.net/10023/25801
dc.descriptionThis research was supported by the HiTech AlkCarb project, funded through the European Union Horizon 2020 research and innovation program (689909).en
dc.description.abstractAbstract Development of renewable energy infrastructure requires critical raw materials, such as the rare earth elements (REEs, including scandium) and niobium, and is driving expansion and diversification in their supply chains. Although alternative sources are being explored, the majority of the world’s resources of these elements are found in alkaline-silicate rocks and carbonatites. These magmatic systems also represent major sources of fluorine and phosphorus. Exploration models for critical raw materials are comparatively less well developed than those for major and precious metals, such as iron, copper, and gold, where most of the mineral exploration industry continues to focus. The diversity of lithologic relationships and a complex nomenclature for many alkaline rock types represent further barriers to the exploration and exploitation of REE-high field strength element (HFSE) resources that will facilitate the green revolution. We used a global review of maps, cross sections, and geophysical, geochemical, and petrological observations from alkaline systems to inform our description of the alkaline-silicate REE + HFSE mineral system from continental scale (1,000s km) down to deposit scale (~1 km lateral). Continental-scale targeting criteria include a geodynamic trigger for low-degree mantle melting at high pressure and a mantle source enriched in REEs, volatile elements, and alkalies. At the province and district scales, targeting criteria relate to magmatic-system longevity and the conditions required for extensive fractional crystallization and the residual enrichment of the REEs and HFSEs. A compilation of maps and geophysical data were used to construct an interactive 3-D geologic model (25-km cube) that places mineralization within a depth and horizontal reference frame. It shows typical lithologic relationships surrounding orthomagmatic REE-Nb-Ta-Zr-Hf mineralization in layered agpaitic syenites, roof zone REE-Nb-Ta mineralization, and mineralization of REE-Nb-Zr associated with peralkaline granites and pegmatites. The resulting geologic model is presented together with recommended geophysical and geochemical approaches for exploration targeting, as well as mineral processing and environmental factors pertinent for the development of mineral resources hosted by alkaline-silicate magmatic systems.
dc.format.extent32
dc.language.isoeng
dc.relation.ispartofEconomic Geologyen
dc.rightsCopyright © 2022 The authors and parties of the HiTech AlkCarb project. Open Access. This article is published under the terms of the CC-BY 3.0 license.en
dc.subjectQE Geologyen
dc.subjectNDASen
dc.subject.lccQEen
dc.titleAlkaline-silicate REE-HFSE systemsen
dc.typeJournal articleen
dc.contributor.sponsorEuropean Commissionen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Earth & Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews. Centre for Energy Ethicsen
dc.contributor.institutionUniversity of St Andrews. Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews. St Andrews Isotope Geochemistryen
dc.identifier.doihttps://doi.org/10.5382/econgeo.4956
dc.description.statusPeer revieweden
dc.identifier.grantnumber689909en


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