The Dalradian rocks of the northern Grampian Highlands of Scotland

Leslie, A. G.; Robertson, Steve; Smith, Martin J.; Banks, Christopher J.; Mendum, J. R.; Stephenson, David

doi:10.1016/j.pgeola.2012.07.010

Cited by 10 publications

(4 citation statements)

References 61 publications

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“…At the base of the Dalradian Supergroup in Scotland, the Grampian Group is dominated by psammite and metamorphosed semi-pelite deposited within a number of fault-bounded NE-SWtrending basins (Leslie et al 2013). Analysis of detrital zircon, in which grains with Archaean ages are scarce, indicates derivation from Palaeo-and Mesoproterozoic (meta)granitic rocks (Cawood et al 2003) that could have been sourced from the west and/or east, as there is little difference in the protolith ages of the major crustal blocks that form east Laurentia and west Baltica (Banks et al 2007;Kirkland et al 2011).…”

Section: Regional Geologymentioning

confidence: 99%

The source of Dalradian detritus in the Buchan Block, NE Scotland: application of new tools to detrital datasets

Johnson

Kirkland

Reddy

et al. 2016

JGS

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Detrital zircons from four samples of upper Dalradian metasedimentary rocks from the Buchan Block in the NE Grampian Highlands of Scotland were analysed by laser ablation inductively coupled plasma mass spectrometry to establish their U-Pb age and trace element composition. The analysed grains (magmatic cores) mainly yield concordant ages ranging from Neoproterozoic to Eoarchaean. Kernel density plots of the data show pronounced peaks in the late Mesoproterozoic, Palaeoproterozoic and Neoarchaean eras. The data are indistinguishable from detrital zircon age spectra from Dalradian rocks elsewhere, an interpretation supported by application of a non-parametric multidimensional scaling algorithm, and are consistent with a Laurentian source. Similar to existing studies from other Dalradian rocks, the age spectra from the Buchan Block reveal an increase in the relative proportion of older detritus with time, suggesting derivation from late Mesoproterozoic (Grenville) then Palaeoproterozoic orogens before widespread exposure and denudation of their Archaean basement rocks. Application of a novel approach to estimate the most likely time of radiogenic-Pb loss indicates that some detrital zircon grains were affected by element mobility around 470-450 Ma as a result of Grampian orogenesis.Supplementary material: Laser ablation inductively coupled plasma mass spectrometry U-Pb and trace element data, a matrix showing results of Kolmogorov-Smirnov (K-S) test, cathodoluminescence imaging of zircons and selected trace element plots are available at https://doi.

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Section: Regional Geologymentioning

confidence: 99%

The source of Dalradian detritus in the Buchan Block, NE Scotland: application of new tools to detrital datasets

Johnson

Kirkland

Reddy

et al. 2016

JGS

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“…The Grampian Terrane in mainland Scotland incorporates the early Neoproterozoic Badenoch Group ( possibly correlative with the Moine Supergroup) (Leslie et al 2013). Correlative lithological units in Shetland may be the metasedimentary gneisses of the Yell Sound and Westing groups (Fig.…”

mentioning

confidence: 99%

Evidence from U–Pb zircon geochronology for early Neoproterozoic (Tonian) reworking of an Archaean inlier in northeastern Shetland, Scottish Caledonides

Jahn

Strachan

Fowler

et al. 2016

JGS

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Meta-igneous lithologies of the Cullivoe inlier in NE Yell, Shetland, have tonalite-trondhjemite-granodiorite (TTG) chemistry and yield U-Pb zircon crystallization ages of c. 2856 -2699 Ma. Formation was coeval with protoliths of the Lewisian Gneiss Complex and the time of major Neoarchaean crustal growth in the North Atlantic Craton. The adjacent metasedimentary Yell Sound Group accumulated between c. 1019 and c. 941 Ma. The Cullivoe inlier and the Yell SoundGroup were metamorphosed at c. 944 -931 Ma, the former preserving granulite-facies mineral assemblages inferred to be of this age. Similar-aged metamorphic events recorded in other Laurentian metasedimentary successions in the North Atlantic region are attributed to development of the Valhalla orogen along the Rodinia margin. Ordovician (482 ± 30 Ma) and Silurian (428 ± 16 Ma) thermal rejuvenation resulted from successive phases of the Caledonian orogeny during closure of the Iapetus Ocean. The mechanism by which the Cullivoe inlier was emplaced into its current structural setting is uncertain. Either its western or eastern boundary is a major tectonic break, probably an early ductile thrust. However, this is now cryptic as a result of the Caledonian ductile reworking.Supplementary material: SIMS and LA-ICP-MS analytical data, statistical analyses and major trace element analytical data are available at https://doi.org/10.6084/m9.figshare.c.3575723.

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“…The Badenoch Group (Leslie et al 2013; also known as the Central Highland Division or sub-Grampian Basement; Piasecki and Temperley 1988;Robertson and Smith 1999;Cawood et al 2003) occurs in the Grampian Highlands SE of the Great Glen Fault (Fig. 3) as a series of inliers structurally below the Grampian Group, the basal unit of the Dalradian Supergroup.…”

Section: Badenoch Groupmentioning

confidence: 99%

“…3) as a series of inliers structurally below the Grampian Group, the basal unit of the Dalradian Supergroup. Two units are formally recognized, the Dava and Glen Banchor subgroups, although their relative stratigraphic position is uncertain (Leslie et al 2013;BGS Sheet 74W, British Geological Survey 2004). The rocks are strongly deformed and commonly migmatitic and do not preserve sedimentary features.…”

Section: Badenoch Groupmentioning

confidence: 99%

A new stratigraphic framework for the early Neoproterozoic successions of Scotland

Krabbendam

Strachan

Prave

2021

JGS

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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.

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The Dalradian rocks of the northern Grampian Highlands of Scotland

Cited by 10 publications

References 61 publications

The source of Dalradian detritus in the Buchan Block, NE Scotland: application of new tools to detrital datasets

The source of Dalradian detritus in the Buchan Block, NE Scotland: application of new tools to detrital datasets

Evidence from U–Pb zircon geochronology for early Neoproterozoic (Tonian) reworking of an Archaean inlier in northeastern Shetland, Scottish Caledonides

A new stratigraphic framework for the early Neoproterozoic successions of Scotland

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