Seawater signatures in the supracrustal Lewisian Complex, Scotland

John Parnell* (Corresponding Author), Adrian J. Boyce, T Næraa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Marble in the supracrustal rocks of the Lewisian Complex, Tiree, includes chlorine-bearing amphiboles, chlorine-rich apatite, sulphur-rich scapolite, albite and phlogopite, all of which are regarded as evidence for evaporites in other metamorphosed sequences. Titanite yields U-Pb ages of similar to 1.6 Ga, i.e. late Laxfordian, which excludes a younger imprint of sodium metasomatism. Traces of anhydrite, and isotopically heavy pyrite, also indicate deposition from seawater. Elsewhere in the Hebrides, tourmaline in Lewisian Complex marbles may represent seafloor exhalative deposits. Combined, the evidence suggests Lewisian Complex supracrustal marbles formed in an evaporative environment, like other Palaeoproterozoic successions across the North Atlantic region.

Original languageEnglish
Article number0016756822000474
Number of pages9
JournalGeological Magazine
Early online date2 Jun 2022
DOIs
Publication statusPublished - 2 Jun 2022

Keywords

  • Lewisian
  • RICH SCAPOLITE
  • scapolite
  • ROCKS
  • Scotland
  • Tiree
  • DEPOSIT
  • Palaeoproterozoic
  • evaporites
  • GEOCHRONOLOGY
  • marble
  • EVOLUTION
  • FLUID INCLUSION
  • MINERALIZATION
  • EVAPORITE
  • ISOTOPE
  • titanite
  • METASOMATISM

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