Detrital zircon ages from the Loch Maree Group, Lewisian Complex, NW Scotland: confirmation of a Palaeoproterozoic Laurentia—Fennoscandia connection
- 1 December 1997
- journal article
- Published by Wiley in Terra Nova
- Vol. 9 (5-6) , 260-263
- https://doi.org/10.1111/j.1365-3121.1997.tb00025.x
Abstract
Ion‐microprobe U‐Pb zircon ages of detrital zircons from a metasediment of the Loch Maree Group, Lewisian Complex, NW Scotland show striking similarities to those in coeval Palaeoproterozoic belts of Laurentia and Fennoscandia, and confirm previous suggestions of a connection between them. Late‐Archaean zircons (3.06–2.48 Gyr old) represent derivation from Lewisian quartzofeldspathic gneisses, andlor a contemporaneous terrane. Palaeoproterozoic zircons (2.2–2.0 Gyrold) place a maximum age constraint upon deposition. An appropriate quartzofeldspathic source for these latter zircons is not presently known, either in the Lewisian or the wider Laurentia‐Fennoscandia region, although its requirement would be consistent with a development of the Loch Maree Group, together with juvenile magmatic arc rocks, at an active margin which was probably removed by lateral tectonics. Comparisons are made with contemporaneous supracrustal sequences throughout the Laurentia–Fennoscandia region, which exhibit marked similarities in source region age characteristics, lithologies, and inferred depositional environment.Keywords
This publication has 16 references indexed in Scilit:
- Geochronology of Archaean and Proterozoic events in the Ammassalik area, South-East Greenland, and comparisons with the Lewisian of Scotland and the Nagssugtoqidian of West GreenlandPublished by Elsevier ,2003
- U-Pb isotopic evidence for the accretion of different crustal blocks to form the Lewisian Complex of northwest ScotlandContributions to Mineralogy and Petrology, 1997
- Comparison of TIMS (U-Pb) and laser ablation microprobe ICP-MS (Pb) techniques for age determination of detrital zircons from Paleoproterozoic metasedimentary rocks from northeastern Laurentia, Canada, with tectonic implicationsChemical Geology, 1996
- Anatomy of the Early Proterozoic Nagssugtoqidian orogen, West Greenland, explored by reconnaissance SHRIMP U-Pb zircon datingGeology, 1996
- New evidence for protolith ages of Lewisian granulites, northwest ScotlandGeology, 1995
- Early Proterozoic tectonic overview of the northern British Isles and neighbouring terrains in Laurentia and BalticaPrecambrian Research, 1994
- Svecofennian detrital zircon ages—implications for the Precambrian evolution of the Baltic ShieldPrecambrian Research, 1993
- U–Pb baddeleyite ages for the Scourie dyke swarm, Scotland: evidence for two distinct intrusion eventsNature, 1989
- A Nd isotope investigation of sediments related to crustal development in the British IslesEarth and Planetary Science Letters, 1983
- A Sm-Nd isotopic study of the South Harris Igneous Complex, the Outer HebridesContributions to Mineralogy and Petrology, 1983