A Caledonian age for the Kiloran Bay appinite intrusion on Colonsay, Inner Hebrides

Muir, R. J.; Ireland, Trevor; Bentley, Mark; Fitches, W. R.; Maltman, Alex

doi:10.1144/sjg33010075

Cited by 8 publications

(1 citation statement)

References 25 publications

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“…Bentley, 1988). The Colonsay Group has been correlated with various Neoproterozoic successions in Scotland including the Torridonian, the Moine Supergroup and the Dalradian Supergroup, with most recent interpretations favouring a correlation with the Dalradian Supergroup (Muir et al, 1997;McAteer et al, 2010b).…”

Section: Laurentian Basement In the Grampian Terrane -The Rhinns Complexmentioning

confidence: 99%

The Laurentian Caledonides of Scotland and Ireland

Chew

Strachan

2013

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The Caledonides of Britain and Ireland are one of the most intensively studied orogenic belts in the world. This review considers all the tectonic events associated with the development and closure of the Iapetus Ocean. It first summarizes the tectonic evolution of each segment involved in the Scottish-Irish sector of the Caledonides and then reviews the temporal evolution of the Caledonian orogeny. Three main tectonic phases are recognized in the Scottish-Irish Caledonides: an Early to Middle Ordovician (475-465 Ma) phase termed the Grampian Orogeny, a phase of Silurian (435-425 Ma) tectonism restricted to the Northern Highland Terrane of Scotland termed the Scandian Orogeny, and an Early Devonian (395 Ma) phase, termed the Acadian Orogeny. The Grampian Orogeny was caused by the collision of the Laurentian continental margin with an oceanic arc terrane and associated supra-subduction zone ophiolites during the latest Cambrian to Early Ordovician. Following the Grampian arc-continent collision event there was a subduction polarity reversal. This facilitated continued subduction of Iapetan oceanic lithosphere and an Andean-type continental margin developed on and adjacent to the Laurentian margin in the Middle Ordovician along with a substantial thickness of accretionary prism sediments (the Southern Uplands-Longford-Down terrane). The Iapetus Ocean is believed to have disappeared by the Late Silurian based on the faunal record and a continent-continent collision ensued. The absence of significant regional deformation and metamorphism associated with the Late Silurian collision between Avalonia and the Scottish-Irish margin of Laurentia suggests that the continental collision in this sector of the Caledonian-Appalachian orogen was 'soft' or highly oblique. The exception is the Northern Highlands Terrane of Scotland that was believed to have been situated 500-700 km to the north along orogenic strike. This terrane records evidence for significant Silurian regional deformation and metamorphism attributed to the collision of the Laurentian margin of East Greenland with Baltica (the Scandian Orogeny). Current controversies in the Laurentian Caledonides of Scotland and Ireland are discussed at the end of this review.

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Section: Laurentian Basement In the Grampian Terrane -The Rhinns Complexmentioning

confidence: 99%

The Laurentian Caledonides of Scotland and Ireland

Chew

Strachan

2013

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Appinite suites: A record of the role of water in the genesis, transport, emplacement and crystallization of magma

Murphy

2013

Earth-Science Reviews

104

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The Dalradian rocks of the south-west Grampian Highlands of Scotland

Tanner

Bendall

Pickett³

et al. 2013

Proceedings of the Geologists' Association

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The south-west Grampian Highlands, as defined here, include the Inner Hebridean islands of Islay and Jura, and extend north-east as far as Dalmally at the northern tip of Loch Awe. Due to a favourable combination of excellent coastal exposures and low tectonic strain, the late-Neoproterozoic rocks of the Dalradian Supergroup in this region are ideal for studying sedimentary structures. In addition, the diversity in protolith lithology from carbonate rocks to siliciclastic rocks of all grain sizes and volcanic rocks makes it possible to establish a very detailed lithostratigraphical succession and to recognize lateral facies changes. The stratigraphical range extends from the base of the Appin Group to the base of the Southern Highland Group and the area provides type localities for many regionally extensive formations of the Argyll Group. Rocks forming part of the basement to the Dalradian basins, the Rhinns Complex, are seen on Islay, where they are overlain by the Colonsay Group, a thick metasedimentary siliciclastic sequence of uncertain stratigraphical affinity. The structure of the Dalradian rocks in the south-west Grampian Highlands is controlled by early (D1) major folds (Islay Anticline, Loch Awe Syncline, and Ardrishaig Anticline), associated with a ubiquitous, penetrative, slaty or spaced cleavage. Most of the Dalradian rocks have been regionally metamorphosed under greenschist-facies conditions and amphibolite-facies (garnet zone) assemblages occur only in a narrow central zone, strongly affected by the D2 deformation. The area provides GCR sites of international importance for studying Neoproterozoic glacial deposits, splendidly preserved stromatolite bioherms and calcite pseudomorphs after gypsum. Deformed and undeformed sandstone dykes and interstratal dewatering structures are well displayed at several sites. Other features include thick sills of basic meta-igneous rock with unusual minerals such as stilpnomelane, and greenschist-facies rocks containing regional metamorphic kyanite. The area is of historical interest for the first recognition in Scotland, prior to 1910, of sedimentary way-up structures and pillow lavas in regionally deformed and metamorphosed rocksPeer reviewe

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A Caledonian age for the Kiloran Bay appinite intrusion on Colonsay, Inner Hebrides

Cited by 8 publications

References 25 publications

The Laurentian Caledonides of Scotland and Ireland

The Laurentian Caledonides of Scotland and Ireland

Appinite suites: A record of the role of water in the genesis, transport, emplacement and crystallization of magma

The Dalradian rocks of the south-west Grampian Highlands of Scotland

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