Petrogenesis of ultramafic lamprophyres from the terina complex (Chadobets upland, Russia): Mineralogy and melt inclusion composition

Ilya Prokopyev, Anastasiya Starikova, Anna Doroshkevich, Yazgul Nugumanova, Vladislav Potapov

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The mineral composition and melt inclusions of ultramafic lamprophyres of the Terina complex were investigated. The rocks identified were aillikites, mela-aillikites, and damtjernites, and they were originally composed of olivine macrocrysts and phenocrysts, as well as phlogopite phenocrysts in carbonate groundmass, containing phlogopite, clinopyroxene and feldspars. Minor and accessory minerals were fluorapatite, ilmenite, rutile, titanite, and sulphides. Secondary minerals identified were quartz, calcite, dolomite, serpentine, chlorite, rutile, barite, synchysite-(Ce), and monazite-(Ce). Phlogopite, calcite, clinopyroxene, Ca-amphibole, fluorapatite, magnetite, and ilmenite occurred as daughter-phases in melt inclusions. The melt inclusions also contained Fe–Ni sulphides, synchysite-(Ce) and, probably, anhydrite. The olivine macrocrysts included orthopyroxene and ilmenite, and the olivine phenocrysts included Cr-spinel and Ti-magnetite inclusions. Crystal-fluid inclusions in fluorapatite from damtjernites contain calcite, clinopyroxene, dolomite, and barite. The data that were obtained confirm that the ultramafic lamprophyres of the Terina complex crystallized from peridotite mantle-derived carbonated melts and they have not undergone significant fractional crystallization. The investigated rocks are considered to be representative of melts that are derived from carbonate-rich mantle beneath the Siberian craton.

Original languageEnglish
Article number419
Number of pages24
JournalMinerals
Volume10
Issue number5
DOIs
Publication statusPublished - 8 May 2020

Keywords

  • Aillikite
  • Damtjernite
  • Melt inclusion
  • Siberian Craton
  • Ultramafic lamprophyre
  • ultramafic lamprophyre
  • IGNEOUS ROCKS
  • damtjernite
  • NEPHELINE SYENITES
  • LITHOSPHERIC MANTLE
  • CHUKTUKON CARBONATITE MASSIF
  • UNALTERED KIMBERLITES
  • SOUTH GREENLAND
  • MAYMECHA-KOTUY
  • TRACE-ELEMENTS
  • melt inclusion
  • UDACHNAYA-EAST PIPE
  • GULI MASSIF
  • aillikite

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