Sakhaite, ca. Ca48Mg16(BO3)32(CO3)16(HCl,H2O)2, is a rare rock-forming borate-carbonate mineral typically occurring in high-temperature, low-pressure calcareous skarns. It forms a complete solid solution with harkerite, ca. Ca48Mg16[AlSi4(O,OH)16]4(BO3)16(CO3)16(HCl,H2O)2. The solid solution can be described with the general formula
Research Article| September 30, 2019 Economic mineralization in pegmatites: comparing and contrasting NYF and LCT examples Kathryn M. Goodenough; Kathryn M. Goodenough § British Geological Survey, Edinburgh, UK § Corresponding author e-mail address: kmgo@bgs.ac.uk Search for other works by this author on: GSW Google Scholar Richard A. Shaw; Richard A. Shaw British Geological Survey, Keyworth, Nottingham, UK Search for other works by this author on: GSW Google Scholar Martin Smith; Martin Smith School of Environment and Technology, University of Brighton, UK Search for other works by this author on: GSW Google Scholar Guillaume Estrade; Guillaume Estrade Geosciences Environnement Toulouse, France Search for other works by this author on: GSW Google Scholar Eva Marqu; Eva Marqu School of Environment and Technology, University of Brighton, UK Search for other works by this author on: GSW Google Scholar Cyrielle Bernard; Cyrielle Bernard Geosciences Environnement Toulouse, France Search for other works by this author on: GSW Google Scholar Paul Nex Paul Nex University of the Witwatersrand, South Africa Search for other works by this author on: GSW Google Scholar The Canadian Mineralogist (2019) 57 (5): 753–755. https://doi.org/10.3749/canmin.AB00013 Article history first online: 07 Oct 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Kathryn M. Goodenough, Richard A. Shaw, Martin Smith, Guillaume Estrade, Eva Marqu, Cyrielle Bernard, Paul Nex; Economic mineralization in pegmatites: comparing and contrasting NYF and LCT examples. The Canadian Mineralogist 2019;; 57 (5): 753–755. doi: https://doi.org/10.3749/canmin.AB00013 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyThe Canadian Mineralogist Search Advanced Search Granitic pegmatites can represent superb deposits of rare metals, including some 'critical metals' that are important for many modern technologies (Linnen et al. 2012, London 2018). Notably, the majority of ore deposits associated with granitic pegmatites are found in LCT pegmatites, which represent many of the world's resources of lithium, tantalum, cesium and beryllium. In contrast, the NYF pegmatites may be enriched in the rare earth elements (REE) and niobium, but they rarely contain economic resources of these metals. Compared with LCT pegmatites, NYF pegmatites have seen relatively little research. This contribution will compare recent work... You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Les terres rares (TR) sont un groupe de metaux utilises dans de nombreuses nouvelles technologies. Leur production est limitee, il est donc important de trouver de nouvelles sources d'approvisionnement. Les TR sont divisees en TR legeres et lourdes, ces-dernieres etant plus rares et ayant plus d'applications. Les granites et pegmatites alcalins sont des roches riches en TR lourdes. Une partie de cet enrichissement est d'origine magmatique, mais le role des fluides hydrothermaux (i.e. eau, CO2, methane surtout) pose question. Ce manuscrit se concentre sur l'etude de mineraux communs (amphiboles, pyroxene, zircon) et des inclusions fluides de six zones du monde pour comprendre l'impact des fluides hydrothermaux par rapport a celui des processus magmatiques dans les granites et pegmatites alcalins. Les resultats montrent que la concentration et le fractionnement des TR sont lies a la circulation de fluides hydrothermaux riches en Na et K ou Ca et Na a des temperatures inferieures a 400 °C.
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