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A new stratigraphic framework for the early Neoproterozoic successions of Scotland

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Krabbendam_2021_JGS_NewStratigraphic_CC.pdf (8.929Mb)
Date
06/10/2021
Author
Krabbendam, Maarten
Strachan, Rob
Prave, Tony
Keywords
DA Great Britain
QE Geology
T-DAS
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Abstract
The circum-North Atlantic region archives three major late-Mesoproterozoic to Neoproterozoic tectonic episodes, the Grenville-Sveconorwegian and Renlandian orogenies followed by rifting and formation of the Iapetus Ocean, and each is bracketed by sedimentary successions that define three megasequences. In this context, we summarise sedimentological and geochronological data and propose a new stratigraphic framework for the iconic Torridonian-Moine-Dalradian successions and related units in Scotland. The Iona, Sleat, Torridon and Morar groups of the Scottish mainland and Inner Hebrides, and the Westing, Sand Voe and Yell Sound groups in Shetland, form the newly named Wester Ross Supergroup. They were deposited c. 1000–950 Ma within a foreland basin to the Grenville Orogen and, collectively, are in Megasequence 1. Some of these units record Renlandian orogenesis at c. 960-920 Ma. The newly named Loch Ness Supergroup consists of the Glenfinnan, Loch Eil and Badenoch groups of the Scottish mainland, deposited c. 900–870 Ma and are assigned to Megasequence 2. These units record Knoydartian orogenesis c. 820-725 Ma. The regionally extensive Dalradian Supergroup belongs to Megasequence 3; it was deposited c. <725-500 Ma and records the opening of the Iapetus Ocean, ultimately leading to deposition of the passive margin Cambrian-Ordovician Ardvreck and Durness groups.
Citation
Krabbendam , M , Strachan , R & Prave , T 2021 , ' A new stratigraphic framework for the early Neoproterozoic successions of Scotland ' , Journal of the Geological Society , vol. Online First . https://doi.org/10.1144/jgs2021-054
Publication
Journal of the Geological Society
Status
Peer reviewed
DOI
https://doi.org/10.1144/jgs2021-054
ISSN
0016-7649
Type
Journal article
Rights
Copyright © 2021 UKRI. The British Geological Survey. Published by The Geological Society of London. This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License (http://creativecommons.org/licenses/by/4.0/).
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  • University of St Andrews Research
URL
https://jgs.lyellcollection.org/content/early/2021/08/25/jgs2021-054
URI
http://hdl.handle.net/10023/24155

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