Major late Caledonian and Hercynian shear movements on the Great Glen Fault

Storetvedt, K.M.

doi:10.1016/0040-1951(87)90213-7

Cited by 28 publications

(16 citation statements)

References 56 publications

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“…The component (D) orientation at Loch Lintrathen contradicts that expected should the Storetvedt (1987) model to account movements along the Great Glen Fault (GGF) be considered (i.e. the D pole data agrees with equivalent results to the northwest of the GGF).…”

Section: B4 Component (D)mentioning

confidence: 76%

Palaeomagnetic and geochemical evaluation of a terrane-linking ignimbrite: evidence for the relative position of the Grampian and Midland Valley terranes in late Silurian time

Trench

Haughton

1990

Geol. Mag.

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Section: B4 Component (D)mentioning

confidence: 76%

Palaeomagnetic and geochemical evaluation of a terrane-linking ignimbrite: evidence for the relative position of the Grampian and Midland Valley terranes in late Silurian time

Trench

Haughton

1990

Geol. Mag.

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“…It can also be demonstrated that component B can be matched across the WBF/NF at Shetland (Fig. 6; Table 2) and the GGF, thus invalidating the model of Storetvedt (1987), independently of the nature and origin of this remanence. Late Caledonian (Devonian) deformation and remagnetization is widespread in western and central Norway (Torsvik et al 1986(Torsvik et al , 1987(Torsvik et al , 1988(Torsvik et al , 1989a.…”

Section: Discussionmentioning

confidence: 93%

“…Substantial post-Devonian strike-slip faulting along the GGF and its conceivable extension to Shetland, WBF, has been postulated from palaeomagnetic data (Storetvedt 1974(Storetvedt , 1987Van der Voo & Scotese 1981). On the assumption that the A component represented the genuine Devonian palaeo-field, Van der Voo & Scotese (1981) suggested a sinistral displacement in the order of 2000 km.…”

Section: Discussionmentioning

confidence: 95%

“…The model proposed by Storetvedt (1974, 1988) relies on the assumption that the B component is the true Middle-Upper Devonian palaeofield. In Storetvedt's (1987) latest model, the GGF underwent at least 600km sinistral displacement in late Devonian times followed by a later dextral phase in Permian times. In this model, a pre-Middle Devonian fit of palaeomagnetic data across the GGF (see e.g.…”

Section: Discussionmentioning

confidence: 98%

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On the origin and the tectonic implications of magnetic overprinting of the Old Red Sandstone, Shetland

Torsvik¹,

Sturt²,

Ramsay³

1989

Geophysical Journal International

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SUMMARY The magnetic signature of the Old Red Sandstone (ORS) and post‐orogenic plutonics on Shetland is influenced by three principal components, A (pole: S51, EOO3), B (pole: S24, E340) and C (pole: S10, E003). As evidenced from negative fold tests, A is secondary, and most likely thermochemical in origin, presumably associated with hydrothermal fluids circulating in faults and crush zones subsequent to Permian‐Early Triassic extensional reactivation of older Caledouian fault structures. From the ORS, the B component also can be proven to represent a magnetic overprint. The secondary nature of component B, and the fact that it reasonably can be correlated on both sides of the Walls Boundary Fault, commonly assumed to be the continuation of the Great Glen Fault, argues against recent suggestions of mega‐shearing within the Great Glen Fault system. The precise time of acquisition of B is uncertain, but we consider a lower Carboniferous age synchronous with late‐post orogenic plutonic activity (334‐358 Ma) to be most likely. This implies that the B component carried by the plutonic rocks may represent a primary cooling event. C is exclusively carried out by Middle Devonian andesites and basalts from the Esha Ness Peninsula. It is evidently of post‐fold origin, and we relate this earliest magnetic overprinting to Middle‐Upper Devonian (Svalbardian) tectonism which affected the North Atlantic domain during this period.

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“…The total offset of post Devonian dextral strike slip along the Great Glen-Walls Boundary faults system has been a matter of much discussion depending greatly on the method involved: Storetvedt (1987) Scotese's (1981) proposition of 2000 km sinistral Hercynian offset may be ruled out as observed post-Devonian shear zones are clearly dextral in sense and it is very unlikely that a fault with such a large offset would produce no detectable strain in the surrounding rocks.…”

Section: Kinematics and Age Of The Inversionmentioning

confidence: 99%

Devonian extensional tectonics versus Carboniferous inversion in the northern Orcadian basin

Séranne

1992

JGS

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The Old Red Sandstone (Middle Devonian) Orcadian basin was formed as a consequence of extensional collapse of the Caledonian orogen. Onshore study of these collapse-basins in Orkney and Shetland provides directions of extension during basin development. The origin of folding of Old Red Sandstone sediments, that has generally been related to a Carboniferous inversion phase, is discussed: syndepositional deformation supports a Devonian age and consequently some of the folds are related to basin formation. Large-scale folding of Devonian strata results from extensional and left-lateral transcurrent faulting of the underlying basement. Spatial variation of extension direction and distribution of extensional and transcurrent tectonics fit with a model of regional releasing overstep within a left-lateral megashear in NW Europe during late-Caledonian extensional collapse. Later inversion (probably during the Upper Carboniferous) is characterized by E–W to NE–SW contraction. It induced reactivation of extensional faults as thrusts, development of small-scale folds and thrusts, and right lateral transcurrent movement of the major faults such as the Great Glen and Walls Boundary faults.

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Major late Caledonian and Hercynian shear movements on the Great Glen Fault

Cited by 28 publications

References 56 publications

Palaeomagnetic and geochemical evaluation of a terrane-linking ignimbrite: evidence for the relative position of the Grampian and Midland Valley terranes in late Silurian time

Palaeomagnetic and geochemical evaluation of a terrane-linking ignimbrite: evidence for the relative position of the Grampian and Midland Valley terranes in late Silurian time

On the origin and the tectonic implications of magnetic overprinting of the Old Red Sandstone, Shetland

Devonian extensional tectonics versus Carboniferous inversion in the northern Orcadian basin

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