Next Article in Journal
Hydration Mechanism and Hardening Property of α-Hemihydrate Phosphogypsum
Next Article in Special Issue
Binding Properties of Mechanically Activated Nepheline Containing Mining Waste
Previous Article in Journal
Sintering Behavior and Technological Properties of Low-Temperature Porcelain Tiles Prepared Using a Lithium Ore and Silica Crucible Waste
Previous Article in Special Issue
Petrogenesis of the Eudialyte Complex of the Lovozero Alkaline Massif (Kola Peninsula, Russia)
Open AccessArticle

Britholite Group Minerals from REE-Rich Lithologies of Keivy Alkali Granite—Nepheline Syenite Complex, Kola Peninsula, NW Russia

1
Geological Institute, Kola Science Centre, 14 Fersman Str, 184209 Apatity, Russia
2
Institute of Geochemistry, Mineralogy and Petrology, University of Warsaw, al. Żwirki i Wigury 93, 02089 Warsaw, Poland
3
Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(12), 732; https://doi.org/10.3390/min9120732
Received: 12 October 2019 / Revised: 17 November 2019 / Accepted: 25 November 2019 / Published: 27 November 2019
The Keivy alkali granite-nepheline syenite complex, Kola Peninsula, NW Russia, contains numerous associated Zr-REE-Y-Nb occurrences and deposits, formed by a complex sequence of magmatic, late-magmatic, and post-magmatic (including pegmatitic, hydrothermal, and metasomatic) processes. The REE-rich lithologies have abundant (some of economic importance) and diverse britholite group minerals. The REE and actinides distribution in host rocks indicates that the emanating fluids were alkaline, with significant amounts of F and CO2. From chemical studies (REE and F variations) of the britholites the possible fluid compositions in different lithologies are proposed. Fluorbritholite-(Y) and britholite-(Y) from products of alkali granite (mineralized granite, pegmatite, quartzolite) formed under relatively high F activity in fluids with low CO2/H2O ratio. The highest F and moderate CO2 contents are characteristic of fluid from a mineralized nepheline syenite, resulting in crystallization of fluorbritholite-(Ce). Britholite group minerals (mainly fluorcalciobritholite and ‘calciobritholite’) from a nepheline syenite pegmatite formed from a fluid with composition changing from low F and high CO2 to moderate F and CO2. An extremely high F content is revealed for metasomatizing fluids emanating from alkali granitic magma and which affected the basic country rocks. The dominant substitution scheme for Keivy britholites is REE3+ + Si4+ = Ca2+ + P5+, showing the full range of ‘britholite’ and ‘calciobritholite’ compositions up to theoretical apatite. View Full-Text
Keywords: britholite group minerals; alkali granite; nepheline syenite; pegmatite; quartzolite; metasomatite; fluid composition; Keivy; Kola Peninsula; Russia britholite group minerals; alkali granite; nepheline syenite; pegmatite; quartzolite; metasomatite; fluid composition; Keivy; Kola Peninsula; Russia
Show Figures

Figure 1

MDPI and ACS Style

Zozulya, D.; Lyalina, L.; Macdonald, R.; Bagiński, B.; Savchenko, Y.; Jokubauskas, P. Britholite Group Minerals from REE-Rich Lithologies of Keivy Alkali Granite—Nepheline Syenite Complex, Kola Peninsula, NW Russia. Minerals 2019, 9, 732.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop