Early curvilinear fold structures and strain in the Moine of the Glen Garry region, Inverness-shire

Holdsworth, R. E.; Roberts, Alan

doi:10.1144/gsjgs.141.2.0327

Cited by 44 publications

(20 citation statements)

References 32 publications

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“…An identical N -S trending lineation, also of L2 age in the regional structural chronology, is widespread within the Loch Eil division Moine of Inverness-shire (Holdsworth and Roberts 1984;Strachan 1985). Similar N -S trending lineations have also been recorded within the westerly Morar division Moine (Ramsay 1958;Shepherd 1973;Barber and May 1976), where they pre-date intrusion of the Cam Chuinneag Granite at c. 550 Ma (Pidgeon and Johnson 1974).…”

Section: Discussionsupporting

confidence: 57%

The metamorphic rocks of the Scaraben area, East Sutherland and Caithness

Strachan

1988

SJG

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SYNOPSISThe Scaraben area contains a continuous sequence of metasediments which include psammites and semi-pelites, of undoubted Moine affinities, and the Scaraben Quartzite which several workers have assigned to the Dalradian. These metasediments have undergone a common tectono-metamorphic history, involving four phases of deformation (D1-D4) and associated amphibolite-facies metamorphism. Four different phases of granite intrusion have been identified. The Scaraben Quartzite is assigned to the 'old Moine' of the Northern Highlands: there is no evidence that it is an outlier of the Dalradian NW of the Great Glen Fault.

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Section: Discussionsupporting

confidence: 57%

The metamorphic rocks of the Scaraben area, East Sutherland and Caithness

Strachan

1988

SJG

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“…It has been long considered that D 1 þ D 2 in the Moine are of Precambrian age (Holdsworth & Roberts 1984), with D 3 as the main Caledonian (now Grampian) reworking event.…”

Section: Geological Setting: the Moine Rocks Of The Western Highlandsmentioning

confidence: 99%

Late Precambrian U–Pb titanite age for peak regional metamorphism and deformation (Knoydartian orogeny) in the western Moine, Scotland

Tanner

Evans²

2003

JGS

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There has been controversy over the number and timing of orogenies in the Precambrian Moine block in the Scottish Caledonides since the earliest radiometric dating in the 1960s. This work challenges a recent hypothesis, that this sector of the Laurentian margin was subjected to continuous crustal extension between .900 and 470 Ma. U-Pb dating (thermal ionization mass spectrometry) of titanite from a calcsilicate pod in the Moine (Morar Group) of the western Highlands gives an age of 737 AE 5 Ma. The titanite grew from Fe-Ti-bearing detrital minerals during the main progressive, syn-D 2 , amphibolite-facies (sillimanite zone) regional metamorphism, thus demonstrating that a Neoproterozoic contractional tectonothermal event (Knoydartian orogeny) affected the Moine block following the rift-related emplacement of the West Highland granite gneiss at 873 Ma. We conclude that the Sgurr Beag Thrust, a major tectonic break separating the Morar and Glenfinnan groups of the Moine, is mainly of Neoproterozoic, not Caledonian, age. The early tectonothermal event was succeeded by the Grampian Phase (Caledonian orogeny) at 460-470 Ma.

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“…In addition to this several examples of single fold pairs overturning both east and west, i.e. showing the phenomenon of 'double vergence' (Holdsworth and Roberts 1984), are present (Loc. 3 Figs.…”

Section: Regional Structurementioning

confidence: 83%

Fold and thrust structures in the Kintradwell ‘Boulder Beds’, Moray Firth

Roberts¹

1989

SJG

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Synopsis The Kimmeridgian shales, sands and ‘boulder-beds’ exposed at Kintradwell Point in Sutherland display a complex series of ‘soft-sediment’ deformation features, which can be assigned to four categories, on the basis of both geometry and temporal relationship. Small, closely-spaced, syn-depositional normal faults, throwing down to the S/SE. Slump folds with intensely curvilinear hinges, produced by differential movement within a wet-sediment pile slumping to the south, obliquely away from the Helmsdale Fault. ‘Thrust’ faults together with related low-angle slides and extensional faults. These gravity-driven structures moved perpendicular to and away from the Helmsdale Fault. They represent a section through the leading edge of a large, detached gravity-slide. Isolated, down-to-the-SE, brittle normal faults, tens of metres in length. These offset slump-fold and slide structures. Structures belonging to category 4 may be the product of tectonic strain related to the opening of the Moray Firth Basin. The remainder are all thought to be local, gravity-driven structures, generated on a late Jurassic palaeoslope dipping away from the Helmsdale Fault. Many geometric analogues for the Kintradwell structures are found not only in slump sheets documented elsewhere but also in the internal parts of contractional orogenic belts. Familiarity with the analysis of such ordered structures from within orogenic belts such as the Caledonides of the Scottish Highlands, facilitates an understanding of the section at Kintradwell. Sequences similar to that at Kintradwell have been discovered during offshore hydrocarbon exploration in the North Sea. The observations presented in this paper have implications for the analysis of cores from such sequences.

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Early curvilinear fold structures and strain in the Moine of the Glen Garry region, Inverness-shire

Cited by 44 publications

References 32 publications

The metamorphic rocks of the Scaraben area, East Sutherland and Caithness

The metamorphic rocks of the Scaraben area, East Sutherland and Caithness

Late Precambrian U–Pb titanite age for peak regional metamorphism and deformation (Knoydartian orogeny) in the western Moine, Scotland

Fold and thrust structures in the Kintradwell ‘Boulder Beds’, Moray Firth

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