Geological history and structure of Scotland

Trewin, Nigel H.; Rollin, K.E.

doi:10.1144/gos4p.1

Cited by 23 publications

(28 citation statements)

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“…These features are also clear at a greater depth of 3.5 km. The 3.5 km layer also shows slow velocities around the Moray Firth where at least 4km of Mesozoic sediment is present in basins (Trewin and Rollin, 2002) and between the Palaeogene lavas of Skye and Mull. There is a fast anomaly around Loch Ericht to the southeast of the Great Glen fault.…”

Section: Resultsmentioning

confidence: 94%

Local earthquake tomography of Scotland

Luckett

Baptie

2015

Geophysical Journal International

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Scotland is a relatively aseismic region for the use of local earthquake tomography, but 40 years of earthquakes recorded by a good and growing network make it possible. A careful selection is made from the earthquakes located by the British Geological Survey (BGS) over the last four decades to provide a dataset maximising arrival time accuracy and ray-path coverage of Scotland. A large number of 1-D velocity models with different layer geometries are considered and differentiated by employing quarry blasts as ground-truth events. Then, SIMULPS14 is used to produce a robust 3-D tomographic P-wave velocity model for Scotland. In areas of high resolution the model shows good agreement with previously published interpretations of seismic refraction and reflection experiments. However, the model shows relatively little lateral variation in seismic velocity except at shallow depths, where sedimentary basins such as the Midland Valley are apparent. At greater depths, higher velocities in the northwest parts of the model suggest that the thickness of crust increases towards the south and east. This observation is also in agreement with previous studies. Quarry blasts used as ground truth events and relocated with the preferred 3-D model are shown to be markedly more accurate than when located with the existing BGS 1-D velocity model.

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Section: Resultsmentioning

confidence: 94%

Local earthquake tomography of Scotland

Luckett

Baptie

2015

Geophysical Journal International

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“…Regional gravity and magnetic anomalies, which show steep gradients coincident with the Portsoy-Duchray Hill Lineament, suggest that there are fundamental differences in the sub-Dalradian basement (Trewin and Rollin, 2002).…”

Section: Stephenson Jr Mendum and Dj Fettesmentioning

confidence: 99%

The Dalradian rocks of the north-east Grampian Highlands of Scotland

Stephenson

Mendum

Fettes

et al. 2013

Proceedings of the Geologists' Association

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“…These methods have been widely applied to the UK aeromagnetic and land-based gravity data within 3 large and overlapping regional areas of South East England, Southern Scotland & Northern England and Northern Scotland (Busby et al 2006;Kimbell et al 2006;Rollin, 2009, respectively). Further examples are provided by Trewin & Rollin (2002) who summarise crustal-scale geophysical models across Scotland.…”

Section: Tablementioning

confidence: 99%

The deep crustal magnetic structure of Britain

Beamish

Kimbell

Pharaoh

2016

Proceedings of the Geologists' Association

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The deep crustal magnetic structure of Britain has not previously been described in a uniform manner. We provide a new assessment of the deep crustal magnetic bodies responsible for the long wavelength magnetic features. The study area contains deep crustal relics of the destruction of early Palaeozoic oceanic lithosphere along the Thor-Tornquist Suture and primarily the Iapetus Suture separating Baltica and Avalonia from the Laurentian terranes. Spectral decomposition is applied to a merged onshore and offshore magnetic anomaly data set. Thirty idealised basement bodies are compared with a representation of the subsurface obtained by a coarse 3D inversion of the data. The central area separating Laurentia and Avalonia, is largely characterised by an absence of high susceptibilities throughout the whole crustal volume. We find that the idealised basement bodies are largely consistent with relatively high susceptibility zones at depths in excess of 10 km. The zones of higher relative susceptibility are referenced to the tectonic-terrane framework of the area and possible geological explanations for the contrasts are reviewed. In the north, the Laurentian terranes are diverse, comprising crust first created in the Archaean (Hebridean Terrane), Palaeoproterozoic (Rhinns Terrane), Mesoproterozoic? (Midland Valley Terrane), Neoproterozoic (sub-Southern Upland rocks) and Ordovician. Magnetic anomalies further record the assembly of the Gondwanan (Eastern Avalonian) part of the country through Neoproterozoic and Ordovician (Tornquist) arc magmatism and accretion. The convergence zones between Laurentia, Avalonia and Baltica have all left a magnetic imprint, as has Variscan convergence to the south.

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Geological history and structure of Scotland

Cited by 23 publications

References 0 publications

Local earthquake tomography of Scotland

Local earthquake tomography of Scotland

The Dalradian rocks of the north-east Grampian Highlands of Scotland

The deep crustal magnetic structure of Britain

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