Trace element composition and Lu-Hf isotope systematics of zircon from plagiogneisses of the Kola superdeep well: contribution of a Paleoarchean crust in Mesoarchean metavolcanic rocks

V. R. Vetrin*, E. A. Belousova, V. P. Chupin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Zircons have been studied in three samples of Archean plagiogneisses from the Kola superdeep well (SG-3). The crystals consist of cores, magmatic shells, and metamorphic rims. The cores and shells are characterized by similar lowered concentrations of most trace elements, which is typical of zircons from plagiogranitoids, rocks of elevated basicity, and basites. At a wide range of Hf isotope characteristics, the cores and shells have similar average 176Hf/177Hfi, which determines the close composition of their sources. The metamorphic rims have close 176Hf/177Hfi ratio. The minimum age of the crustal contaminant of parental melts is estimated at 3.4 and 3.3 Ga for cores and 3.3–3.2 Ga for shells at almost equal proportions of mantle and crustal components in them. The contribution of Paleoarchean crust established in zircons from plagiogneisses of SG-3 using Lu-Hf isotope systematics is confirmed by the presence of 3.3and 3.4-Ga old zircons in surrounding TTG.

Original languageEnglish
Pages (from-to)92-111
Number of pages20
JournalGeochemistry International
Volume54
Issue number1
DOIs
Publication statusPublished - 1 Jan 2016

Keywords

  • Kola superdeep well
  • Lu-Hf systematics
  • Mesoarchean volcanic rocks
  • Paleoarchean crust
  • trace elements
  • zircon

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