Geochemistry International

, Volume 56, Issue 7, pp 651–669 | Cite as

Trace Elements in Alkaline Lamprophyres, Clinopyroxene, and Amphibole of the Tomtor Massif and the Ore Potential of the Melts

  • L. I. PaninaEmail author
  • E. Yu. Rokosova
  • A. T. Isakova
  • A. V. Tolstov


Data obtained on lamprophyres from the carbonatite–volcanic unit in the lower horizon of the Tomtor Massif indicate that the rocks and zoned diopside and kaersutite phenocrysts in them are enriched in incompatible elements more significantly than is typical of alkaline ultramafic rocks of the Maymecha–Kotui and Kola provinces. The concentrations of these elements and their indicator ratios in the cores and intermediate zones of the diopside and kaersutite phenocrysts significantly vary, and this suggests that the minerals might have crystallized from different melts. This is consistent with the earlier conclusions, which were derived from studying melt inclusions, that the phenocrysts crystallized from mixing alkaline mafic melts of sodic and potassic types and different Mg–number which were enriched in the carbonatite component. The cores of the diopside phenocrysts started to crystallize from sodic mafic magma in a magmatic chamber, while the intermediate and outermost zones of this mineral crystallized from mixed sodic–potassic mafic melts. The carbonatite component was separated from the sodic mafic melt at high temperature (>1150°C) during diopside core crystallization. The bulk compositions of the alkaline lamprophyres and of the diopside and kaersutite phenocrysts contain lower normalized concentrations of HREE than LREE. This led us to conclude that the parental sodic and potassic mafic melts were derived from an enriched mantle source material under garnet–facies parameters, as is typical of continental rifts. It is noteworthy that the potassic mafic melt was derived at greater depths and lower degrees of melting of the mantle source than the sodic melt. The iron–rich sodic melt from which the cores of the diopside phenocrysts started to crystallize was enriched in V, REE, Y, and volatile components (H2O, CO2, F, Cl, and S). The onset of carbonate–silicate liquid immiscibility was marked by the redistribution of REE and Y into the carbonatite melt. The potassic, more Mg–rich mafic melt from which the intermediate and outermost zones of the diopside phenocrysts crystallized was enriched in Ti, Nb, Zr, and REE and always remained homogeneous when this mineral crystallized.


alkaline lamprophyres Tomtor Massif zoned diopside and kaersutite phenocrysts trace elements ore potential of melts melt inclusions 


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© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • L. I. Panina
    • 1
    Email author
  • E. Yu. Rokosova
    • 1
  • A. T. Isakova
    • 1
  • A. V. Tolstov
    • 1
  1. 1.Sobolev Institute of Geology and Mineralogy, Siberian BranchRussian Academy of SciencesNovosibirskRussia

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