Fenites associated with carbonatite complexes: A review

Journal article


Wall, F., Chakhmouradian, A.R., Siegfried, P.R., Dahlgren, S., Weatherley, S., Finch, A.A., Marks, M.A.W., Dowman, E., Deady, E., Elliott, Holly and H.A.L., Elliott 2017. Fenites associated with carbonatite complexes: A review. Ore Geology Reviews. 93, pp. 38-59. https://doi.org/10.1016/j.oregeorev.2017.12.003
AuthorsWall, F., Chakhmouradian, A.R., Siegfried, P.R., Dahlgren, S., Weatherley, S., Finch, A.A., Marks, M.A.W., Dowman, E., Deady, E., Elliott, Holly and H.A.L., Elliott
Abstract

Carbonatites and alkaline-silicate rocks are the most important sources of rare earth elements (REE) and niobium (Nb), both of which are metals imperative to technological advancement and associated with high risks of supply interruption. Cooling and crystallizing carbonatitic and alkaline melts expel multiple pulses of alkali-rich aqueous fluids which metasomatize the surrounding country rocks, forming fenites during a process called fenitization. These alkalis and volatiles are original constituents of the magma that are not recorded in the carbonatite rock, and therefore fenites should not be dismissed during the description of a carbonatite system. This paper reviews the existing literature, focusing on 17 worldwide carbonatite complexes whose attributes are used to discuss the main features and processes of fenitization. Although many attempts have been made in the literature to categorize and name fenites, it is recommended that the IUGS metamorphic nomenclature be used to describe predominant mineralogy and textures. Complexing anions greatly enhance the solubility of REE and Nb in these fenitizing fluids, mobilizing them into the surrounding country rock, and precipitating REE- and Nb-enriched micro-mineral assemblages. As such, fenites have significant potential to be used as an exploration tool to find mineralized intrusions in a similar way alteration patterns are used in other ore systems, such as porphyry copper deposits. Strong trends have been identified between the presence of more complex veining textures, mineralogy and brecciation in fenites with intermediate stage Nb-enriched and later stage REE-enriched magmas. However, compiling this evidence has also highlighted large gaps in the literature relating to fenitization. These need to be addressed before fenite can be used as a comprehensive and effective exploration tool.

KeywordsFenite, Carbonatite, Metasomatism, Rare earth elements, Niobium
Year2017
JournalOre Geology Reviews
Journal citation93, pp. 38-59
PublisherElsevier
ISSN01691368
18727360
Digital Object Identifier (DOI)https://doi.org/10.1016/j.oregeorev.2017.12.003
Web address (URL)http://hdl.handle.net/10545/624129
http://creativecommons.org/licenses/by-nc-nd/3.0/us/
hdl:10545/624129
Publication dates11 Dec 2017
Publication process dates
Deposited23 Aug 2019, 13:37
Accepted04 Dec 2017
Rights

© 2018 The Authors. Published by Elsevier B.V.

Attribution-NonCommercial-NoDerivs 3.0 United States

ContributorsUniversity of Exeter
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