Polyphase generation of nappe structures in the Dalradian rocks of the southwest Highlands of Scotland

Roberts, John L.; Treagus, J. E.

doi:10.1144/sjg13030237

Cited by 69 publications

(57 citation statements)

References 28 publications

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“…The main phase of deformation in the eastern part of Islay was the first, D1 and this resulted in the formation of the Islay Anticline (Roberts and Treagus, 1977c).…”

Section: Discussionmentioning

confidence: 99%

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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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“…The main phase of deformation in the eastern part of Islay was the first, D1 and this resulted in the formation of the Islay Anticline (Roberts and Treagus, 1977c).…”

Section: Discussionmentioning

confidence: 99%

“…The Islay Anticline is believed to have formed during the first phase (D1) of Dalradian regional deformation (Roberts and Treagus, 1977c).…”

Section: Descriptionmentioning

confidence: 99%

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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“…Relationships in the area between these NW-facing folds and the SEfacing Tay Nappe are unclear, not least because of large intrusions of late-Caledonian granitic rocks in the Loch Etive-Moor of Rannoch area. In the South-west Grampian Highlands (Tanner et al, 2013a), the upright Loch Awe Syncline fulfils this central role between the SE-facing Tay Nappe and the NW-facing Islay Anticline; Roberts and Treagus (1977c) have attempted to project this fold into the Central Grampian Highlands.…”

Section: Structurementioning

confidence: 99%

“…If proposed correlations with similar structures are correct (e.g. the Benderloch and Ballachulish slides; see the Camas Nathais and St John's Church GCR site reports; Roberts and Treagus, 1977c) the dislocation can probably be traced for most of the length of the Scottish Dalradian outcrop from the Appin district in the south-west to the North-east 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 Grampian Highlands (see the Bridge of Brown GCR site report in Stephenson et al, 2013b).…”

Section: Introductionmentioning

confidence: 99%

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The Dalradian rocks of the central Grampian Highlands of Scotland

Treagus¹,

Tanner

Thomas

et al. 2013

Proceedings of the Geologists' Association

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The Central Grampian Highlands, as defined here, are bounded to the north-west by the Great Glen Fault, to the south-west by Loch Etive and the Pass of Brander Fault and to the south-east by the main outcrop of the Loch Tay Limestone Formation.The more arbitrary northern boundary runs north-west along the A9 road and westwards to Fort William.The detailed stratigraphy of the Dalradian Supergroup ranges from the uppermost Grampian Group through to the top of the Argyll Group, most notably seen in the two classic areas of Loch Leven-Appin and Schiehallion-Loch Tay; Southern Highland Group strata are preserved only in a small structural inlier south of Glen Lyon.Major F1 and F2 folds are complicated by co-axial northeasttrending F3 and F4 folding, as well as by locally important northor NW-trending folds. In the Loch Leven area, nappe-like F1 folds verge to the north-west, whereas to the south-east the major recumbent F1/F2 Tay Nappe verges to the south-east.The trace of the upright Loch Awe Syncline lies between the opposing nappes, but

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The Grampian Orogeny: Mid‐Ordovician Arc–Continent Collision along the Laurentian Margin of Iapetus

Strachan

2012

Geological History of Britain and Ireland

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Polyphase generation of nappe structures in the Dalradian rocks of the southwest Highlands of Scotland

Cited by 69 publications

References 28 publications

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

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

The Dalradian rocks of the central Grampian Highlands of Scotland

The Grampian Orogeny: Mid‐Ordovician Arc–Continent Collision along the Laurentian Margin of Iapetus

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