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Publication Detail
New mineralogical and geochemical data on the Vuorijarvi ultramafic, alkaline and carbonatitic complex (Kola Region, NW Russia)
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Brassinnes S, Demaiffe D, Balaganskaya E, Downes H
  • Publication date:
    01/12/2003
  • Pagination:
    79, 86
  • Journal:
    Periodico di Mineralogia
  • Volume:
    72
  • Issue:
    SPEC. ISSUE 1
  • Status:
    Published
  • Print ISSN:
    0369-8963
Abstract
The Vuorijarvi massif belongs to the famous Devonian (380-360 Ma) alkaline and carbonatitic province of Kola (NW Russia). It is a complex polyphase intrusion made of ultramafic rocks, ijolites-melteigites, carbonatites and related phoscorites. Ultramafic rocks (mainly clinopyroxenites) have been interpreted as cumulates, with variable amounts of trapped interstitial liquid. Ijolites are quite complex: some are aegirine-augite and nepheline cumulates, others are partly recrystallised rocks. Carbonatites and phoscorites (apatite-forsterite-magnetite rocks) are genetically linked; the latter correspond to cumulates of silicate and oxide minerals crystallised from a carbonatitic magma. Two generations of carbonatite have been recognized, calcitic varieties and dolomitic varieties. The three groups of rocks (ultramafic rocks, alkaline silicate rocks and carbonatites) have similar initial Nd-Sr isotopic compositions which suggest their cogenetic character. Apatite is a liquidus phase in the three main lithologies; it presents a continuous chemical evolution trend interpreted in terms of isomorphous substitution 2Ca2+ = REE3+ + Na+, which is compatible with a fractional crystallisation model.
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