Magmatic and Hydrothermal Controls on the Mineralogy of the Basal Zone, Nechalacho REE-Nb-Zr Deposit, Canada☼
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Research Article| December 01, 2017 Magmatic and Hydrothermal Controls on the Mineralogy of the Basal Zone, Nechalacho REE-Nb-Zr Deposit, Canada☼ Volker Möller; Volker Möller 1Earth and Planetary Sciences, McGill University, 3450 University Street, Montreal, Quebec H3A 0E8, Canada †Corresponding author: e-mail, volker.moeller@mail.mcgill.ca Search for other works by this author on: GSW Google Scholar Anthony E. Williams-Jones Anthony E. Williams-Jones 1Earth and Planetary Sciences, McGill University, 3450 University Street, Montreal, Quebec H3A 0E8, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Volker Möller 1Earth and Planetary Sciences, McGill University, 3450 University Street, Montreal, Quebec H3A 0E8, Canada Anthony E. Williams-Jones 1Earth and Planetary Sciences, McGill University, 3450 University Street, Montreal, Quebec H3A 0E8, Canada †Corresponding author: e-mail, volker.moeller@mail.mcgill.ca Publisher: Society of Economic Geologists Accepted: 06 Aug 2017 First Online: 15 Nov 2017 Online Issn: 1554-0774 Print Issn: 0361-0128 © 2017 Economic GeologyEconomic Geology Economic Geology (2017) 112 (8): 1823–1856. https://doi.org/10.5382/econgeo.2017.4531 Article history Accepted: 06 Aug 2017 First Online: 15 Nov 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Volker Möller, Anthony E. Williams-Jones; Magmatic and Hydrothermal Controls on the Mineralogy of the Basal Zone, Nechalacho REE-Nb-Zr Deposit, Canada. Economic Geology 2017;; 112 (8): 1823–1856. doi: https://doi.org/10.5382/econgeo.2017.4531 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 SocietyEconomic Geology Search Advanced Search Abstract The Nechalacho rare metal deposit, and in particular its heavy rare earth element (HREE)-enriched Basal zone, constitute a world-class resource of REEs, zirconium, and niobium. The deposit formed by magmatic accumulation and interstitial crystallization of eudialyte in the upper part of a 2176 Ma layered agpaitic nepheline syenite intrusion. Its endowment in HREEs compared to later-crystallized units in the intrusion is a result of emplacement-level fractionation combined with the compatibility of HREEs in the eudialyte deposited in the Basal zone. Despite the enrichment of REEs, Nb, and Zr by igneous processes and evidence for the immobility of these elements in the Basal zone, hydrothermal alteration had a major impact on the mineralogy of the deposit: eudialyte was completely replaced by a quasi-miaskitic hydrothermal assemblage consisting of REE-Nb-enriched zircon and secondary REE and Nb minerals, mainly fergusonite-(Y) and bastnäsite-(Ce). The host aegirine-nepheline syenite was metasomatically altered to a biotite + quartz + magnetite ± ankerite ± fluorite assemblage. Sodium was lost in large proportions during the alteration, and substantial amounts of Mg were introduced. Mineral equilibria calculated for the hydrothermal conditions (300°C and 4 kbar) indicate that the fluid was mildly reducing (fo2 was 2.0–3.6 log units above the quartz-fayalite-magnetite buffer) and that pH was moderately acidic to mildly alkaline (between 3.7 and 5.7). It is likely that the hydrothermal fluid was initially acidic and neutralized upon reaction with the nepheline syenites. In contrast, the pH for magmatic fluids in equilibrium with fresh nepheline syenite was alkaline, owing to the reaction of nepheline to analcime. Hence, we conclude that the acidic, Mg-bearing hydrothermal fluid responsible for the in situ replacement of eudialyte and alteration of the host syenites was externally derived, likely a crustal fluid introduced during a 1871 to 1835 Ma, regionally pervasive hydrothermal event. The identity and composition of the secondary REE-Nb minerals that now make up the mineral resource were controlled by the original composition of eudialyte and the fluids. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,004 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découle