Using zircon in mafic migmatites to disentangle complex high-grade gneiss terrains – Terrane spotting in the Lewisian complex, NW Scotland

Fischer, Sebastian; Prave, Anthony R.; Johnson, Tim; Cawood, Peter A.; Hawkesworth, Chris J.; Horstwood, M. S.; Eimf,

doi:10.1016/j.precamres.2020.106074

Cited by 15 publications

(11 citation statements)

References 67 publications

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“…Figure 3 Zircon U-Pb dates for the inliers from Friend et al, 2008;Strachan et al, 2020a;Storey et al, 2010;Brewer et al, 2003;Mendum and Noble, 2010 . The dates from the Lewisian Gneiss Complex are only from mainland Scotland and are from Baker et al, 2019;Corfu et al, 1994;Crowley et al, 2015;Davies and Heaman, 2014;Fischer et al, 2021;Love et al, 2004. Irish dates are from Daly, 1996Daly, , 1991.…”

Section: Scotlandmentioning

confidence: 99%

Eclogites and basement terrane tectonics in the northern arm of the Grenville orogen, NW Scotland

Bird¹,

Thirlwall²,

Strachan³

et al. 2023

Preprint

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The presence of eclogites within continental crust is a key indicator of collisional orogenesis and they have been used worldwide to assist in the delineation of ancient collisional sutures. Eclogites within the Eastern Glenelg basement inlier of the Northern Highland Terrane (NHT) have been re-dated in order to provide more accurate constraints on the timing of collision within the northern arm of the Grenville Orogen. The eclogites yield dates of c.1200 Ma which are interpreted to record the onset of convergence, and the NHT as a whole is thought to represent the lower plate in successive 1200-1000 Ma collision events. The Eastern Glenelg basement inlier is viewed as a fragment of the leading edge of the NHT basement that was partially subducted along a suture and then obducted back up the subduction channel. Differences in ages of igneous protoliths and intrusive histories (Storey et al., 2010; Strachan et al., 2020b), and metamorphic events (this paper) between the NHT basement and the Laurentian foreland, suggests that they were separate crustal blocks until after c. 1600 Ma. We therefore suggest that: 1) the NHT represents a fragment of Archean-Paleoproterozoic crust that was reworked within the c. 1600-1700 Ga Labradorian-Gothian belt, although whether it was derived from Laurentia or Baltica (Strachan et al., 2020b) is uncertain (Fig. 3), and 2) amalgamation of the NHT with the Laurentian foreland did not occur until the terminal stages of the Grenville collision at c. 1000 Ma.

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Section: Scotlandmentioning

confidence: 99%

Eclogites and basement terrane tectonics in the northern arm of the Grenville orogen, NW Scotland

Bird¹,

Thirlwall²,

Strachan³

et al. 2023

Preprint

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“…One interpretation of these data, which represents the alternate end-member to the traditional subdivision described above, is that the mainland LGC comprises six distinct "terranes" that have unique Archean histories and were tectonically juxtaposed during the Proterozoic (e.g., Kinny et al 2005). Although the number, extent and significance of individual terranes remains a matter for discussion (e.g., Fischer et al, 2021), the Laxford and Gairloch Shear Zones (Fig. 1a) are generally accepted as major crustal boundaries (Park, 2005;Goodenough et al, 2010Goodenough et al, , 2013.…”

Section: The Lewisian Gneiss Complex Of Mainland Scotlandmentioning

confidence: 99%

“…This was followed by a granulite-amphibolite-facies tectonothermal episode between 2.7 and 2.5 Ga (Taylor et al, 2020), whereby the lower crust could have been at high temperature and melt-bearing for more than 200 m.y.. This protracted tectonothermal episode has also been interpreted as two discrete metamorphic events (e.g., Fischer et al 2021 and references therein): known locally as the granulite-facies Badcallian (ca. 2.7 Ga; Evans and Lambert, 1974;Barnicoat, 1983;Cartwright et al, 1985;Corfu et al, 1994;Andersen et al, 1997;Corfu, 1998;Barooah and Bowes, 2009;Crowley et al, 2015;Feisel et al, 2018) and granulite-to amphibolite-facies Inverian (ca.…”

Section: The Lewisian Gneiss Complex Of Mainland Scotlandmentioning

confidence: 99%

“…Much of the previous research on this topic in the LGC has focused on felsic lithologies (Kinny and Friend, 1997;Friend and Kinny, 2001;Love et al, 2010;Whitehouse and Kemp, 2010;, with a smaller body of work considering the mafic rocks (e.g,. Sills et al, 1982;Johnson et al, 2012;Guice et al, 2020;Fischer et al, 2021). In this paper, we focus on ultramafic-mafic lithologies, whose origin(s) can potentially be attributed to a wide-range of magmatic settings that have varied potential implications for broad-scale geodynamic processes predominant on Earth.…”

Section: Introductionmentioning

confidence: 99%

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Origin of ultramafic–mafic bodies on the Isles of Lewis and Harris (Scotland, UK): Constraints on the Archean–Paleoproterozoic evolution of the Lewisian Gneiss Complex, North Atlantic Craton

Guice

Miocevich

Hughes

et al. 2022

Precambrian Research

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“…In the Caledonian foreland (footwall of the Moine Thrust), the basement comprises mostly Archean meta-igneous rocks of the Lewisian Gneiss Complex (e.g. Kinny and Friend 1997;Friend and Kinny 2001;Kinny et al 2005;Wheeler et al 2010;Fischer et al 2021) but Paleoproterozoic metaigneous and -sedimentary rocks are present locally, such as the Loch Maree Group, South Harris Complex, Laxfordian granitoids (e.g. Park et al 2002;Mason et al 2004;Kinny et al 2005;Goodenough et al 2013) and, on Islay and extending to the north of Ireland, the c. 1800-1750 Ma Rhinns Complex (Marcantonio et al 1988;Muir et al 1992;Daly et al 1991;Daly 1996).…”

Section: Basementmentioning

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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Using zircon in mafic migmatites to disentangle complex high-grade gneiss terrains – Terrane spotting in the Lewisian complex, NW Scotland

Cited by 15 publications

References 67 publications

Eclogites and basement terrane tectonics in the northern arm of the Grenville orogen, NW Scotland

Eclogites and basement terrane tectonics in the northern arm of the Grenville orogen, NW Scotland

Origin of ultramafic–mafic bodies on the Isles of Lewis and Harris (Scotland, UK): Constraints on the Archean–Paleoproterozoic evolution of the Lewisian Gneiss Complex, North Atlantic Craton

A new stratigraphic framework for the early Neoproterozoic successions of Scotland

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