Petrology of alkaline silicate rocks and carbonatites of the Chuktukon massif, Chadobets upland, Russia: Sources, evolution and relation to the Triassic Siberian LIP

Anna G. Doroshkevich, Dmitry A. Chebotarev, Victor V. Sharygin, Ilya R. Prokopyev, Anna M. Nikolenko

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The petrogenesis of temporally and spatially associated carbonatitic and deeply derived carbonated alkaline silicate magmas provides an opportunity to gain insights into the nature of the deepest lithospheric mantle. The Chuktukon massif, which is part of the Chadobets alkaline ultramafic carbonatite complex (Chadobets upland, Siberian craton) is a carbonatite-melilitite-damtjernite intrusion, whose emplacement was coeval with the Siberian Traps large igneous province (LIP). In this study, the sources of the primary melts are examined, the petrogenetic evolution of the complex is reconstructed and the relationship with the Siberian LIP is also discussed. Isotopic and geochemical information indicate that the source for the Chuktukon primary melts was isotopically moderately depleted and the primary melts were formed by low degree partial melting of garnet carbonated peridotite. Hydrothermal processes caused 18 O- and 13 C- enrichment. The weathering process was accompanied by trace element re-distribution and enrichment of the weathering crust in Zn, Th, U, Nb, Pb and REE, relative to the Chuktukon rocks and a change in radiogenic (Sr, Nd) isotope compositions.

Original languageEnglish
Pages (from-to)245-260
Number of pages16
JournalLithos
Volume332-333
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • Carbonatites
  • Chadobets upland
  • Damtjernites
  • Melilitites
  • Source characteristics
  • Triassic Siberian LIP
  • LIQUID IMMISCIBILITY
  • IGNEOUS PROVINCE EVIDENCE
  • FLOOD BASALTS
  • NORTH TRANSBAIKALIA
  • TRACE-ELEMENT
  • DOLOMITE CARBONATITE
  • MELT INCLUSIONS
  • ISOTOPIC COMPOSITIONS
  • GULI MASSIF
  • OLDOINYO LENGAI VOLCANO

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