Reprint of "Rare earth elements in phoscorites and carbonatites of the Devonian Kola Alkaline Province, Russia: Examples from Kovdor, Khibina, Vuoriyarvi and Turiy Mys complexes"
Zaitsev, AN; Williams, CT; Jeffries, TE; et al.Strekopytov, S; Moutte, J; Ivashchenkova, OV; Spratt, J; Petrov, SV; Wall, F; Seltmann, R; Borozdin, AP
Date: 9 June 2014
Journal
Ore Geology Reviews
Publisher
Elsevier
Publisher DOI
Abstract
The Devonian (ca. 385-360 Ma) Kola Alkaline Province includes 22 plutonic ultrabasic-alkaline
complexes, some of which also contain carbonatites and rarely phoscorites. The latter are composite
silicate-oxide-phosphate-carbonate rocks, occurring in close space-time genetic relations with
various carbonatites. Several carbonatites ...
The Devonian (ca. 385-360 Ma) Kola Alkaline Province includes 22 plutonic ultrabasic-alkaline
complexes, some of which also contain carbonatites and rarely phoscorites. The latter are composite
silicate-oxide-phosphate-carbonate rocks, occurring in close space-time genetic relations with
various carbonatites. Several carbonatites types are recognized at Kola, including abundant calcite
carbonatites (early- and late-stage), with subordinate amounts of late-stage dolomite carbonatites,
and rarely magnesite, siderite and rhodochrosite carbonatites. In phoscorites and early-stage
carbonatites the rare earth elements (REE) are distributed among the major minerals including
calcite (up to 490 ppm), apatite (up to 4400 ppm in Kovdor and 3.5 wt.% REE2O3 in Khibina), and
dolomite (up to 77 ppm), as well as accessory pyrochlore (up to 9.1 wt.% REE2O3) and zirconolite
(up to 17.8 wt.% REE2O3). Late-stage carbonatites, at some localities, are strongly enriched in REE
(up to 5.2 wt.% REE2O3 in Khibina) and the REE are major components in diverse major and minor
minerals such as burbankite, carbocernaite, Ca- and Ba-fluocarbonates, ancylite and others. The rare
earth minerals form two distinct mineral assemblages: primary (crystallized from a melt or
carbohydrothermal fluid) and secondary (formed during metasomatic replacement). Stable (C-O)
and radiogenic (Sr-Nd) isotopes data indicate that the REE minerals and their host calcite and/or
dolomite have crystallized from a melt derived from the same mantle source and are co-genetic.
Camborne School of Mines
Collections of Former Colleges
Item views 0
Full item downloads 0