Tomas Naeraa
Forskare
Seawater signatures in the supracrustal Lewisian Complex, Scotland
Författare
Summary, in English
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 ∼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.
Avdelning/ar
- Berggrundsgeologi
Publiceringsår
2022-09-02
Språk
Engelska
Sidor
1638-1646
Publikation/Tidskrift/Serie
Geological Magazine
Volym
159
Issue
9
Dokumenttyp
Artikel i tidskrift
Förlag
Cambridge University Press
Ämne
- Geology
Nyckelord
- evaporites
- Lewisian
- marble
- Palaeoproterozoic
- scapolite
- Scotland
- Tiree
- titanite
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0016-7568