Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Seawater signatures in the supracrustal Lewisian Complex, Scotland

Parnell, J. ; Boyce, A. J. and Næraa, T. LU (2022) In Geological Magazine 159(9). p.1638-1646
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 ∼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... (More)

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.

(Less)
Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
evaporites, Lewisian, marble, Palaeoproterozoic, scapolite, Scotland, Tiree, titanite
in
Geological Magazine
volume
159
issue
9
pages
9 pages
publisher
Cambridge University Press
external identifiers
  • scopus:85138264993
ISSN
0016-7568
DOI
10.1017/S0016756822000474
language
English
LU publication?
yes
id
d2d33381-2955-4e39-b1d5-257a21c6e1a6
date added to LUP
2022-12-02 12:10:52
date last changed
2025-04-04 14:27:39
@article{d2d33381-2955-4e39-b1d5-257a21c6e1a6,
  abstract     = {{<p>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.</p>}},
  author       = {{Parnell, J. and Boyce, A. J. and Næraa, T.}},
  issn         = {{0016-7568}},
  keywords     = {{evaporites; Lewisian; marble; Palaeoproterozoic; scapolite; Scotland; Tiree; titanite}},
  language     = {{eng}},
  month        = {{09}},
  number       = {{9}},
  pages        = {{1638--1646}},
  publisher    = {{Cambridge University Press}},
  series       = {{Geological Magazine}},
  title        = {{Seawater signatures in the supracrustal Lewisian Complex, Scotland}},
  url          = {{http://dx.doi.org/10.1017/S0016756822000474}},
  doi          = {{10.1017/S0016756822000474}},
  volume       = {{159}},
  year         = {{2022}},
}