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dc.contributor.authorSmith, M. P.
dc.contributor.authorMoore, K.
dc.contributor.authorKavecsánszki , D.
dc.contributor.authorFinch, Adrian Anthony
dc.contributor.authorKynicky, J.
dc.contributor.authorWall, F.
dc.identifier.citationSmith , M P , Moore , K , Kavecsánszki , D , Finch , A A , Kynicky , J & Wall , F 2016 , ' From mantle to critical zone : a review of large and giant sized deposits of the rare earth elements ' , Geoscience Frontiers , vol. 7 , no. 3 , pp. 315-334 .
dc.identifier.otherORCID: /0000-0002-3689-1517/work/38002311
dc.descriptionMS, AF and FW acknowledge the support of the NERC SoS:RARE consortium grant (NE/M011267/1). D. Kavecsanszki acknowledges the support of a postgraduate fellowship from the College of Engineering, Mathematics and Physical Sciences at the University of Exeter.en
dc.description.abstractThe rare earth elements are unusual when defining giant-sized ore deposits, as resources are often quoted as total rare earth oxide, but the importance of a deposit may be related to the grade for individual, or a limited group of, the elements. Taking the total REE resource, only one currently known deposit (Bayan Obo) would class as giant (>1.7×107 tonnes contained metal), but a range of others classify as large (>1.7×106 tonnes). With the exception of unclassified resource estimates from the Olympic Dam IOCG deposit, all of these deposits are related to alkaline igneous activity – either carbonatites or agpaitic nepheline syenites. The total resource in these deposits must relate to the scale of the primary igneous source, but the grade is a complex function of igneous source, magmatic crystallisation, hydrothermal modification and supergene enrichment during weathering. Isotopic data suggest that the sources conducive to the formation of large REE deposits are developed in subcontinental lithospheric mantle, enriched in trace elements either by plume activity, or by previous subduction. The reactivation of such enriched mantle domains in relatively restricted geographical areas may have played a role in the formation of some of the largest deposits (e.g. Bayan Obo). Hydrothermal activity involving fluids from magmatic to meteoric sources may result in the redistribution of the REE and increases in grade, depending on primary mineralogy and the availability of ligands. Weathering and supergene enrichment of carbonatite has played a role in the formation of the highest grade deposits at Mount Weld (Australia) and Tomtor (Russia). For the individual REE with the current highest economic value (Nd and the HREE), the boundaries for the large and giant size classes are 2 orders of magnitude lower, and deposits enriched in these metals (agpaitic systems, ion absorption deposits) may have significant economic impact in the near future.
dc.relation.ispartofGeoscience Frontiersen
dc.subjectRare earth elementsen
dc.subjectGiant depositen
dc.subjectGE Environmental Sciencesen
dc.titleFrom mantle to critical zone : a review of large and giant sized deposits of the rare earth elementsen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. Earth and Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews. Marine Alliance for Science & Technology Scotlanden
dc.contributor.institutionUniversity of St Andrews. Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews. St Andrews Isotope Geochemistryen
dc.description.statusPeer revieweden

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