David Schofield

British Geological Survey

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John W.F. Waldron

University of Alberta

Kathryn Goodenough

British Geological Survey

Philip R. Wilby

British Geological Survey

Bert De Waele

Curtin University

Wilfried Bauer

German University of Technology

Sandra M. Barr

Acadia University

Ian Millar

British Geological Survey

M. Rabarimanana

Bureau de Recherches Géologiques et Minières

Matthew Horstwood

British Geological Survey

Cees R. van Staal

Geological Survey of Canada

Cooperative Institutions

British Geological Survey

Memorial University of Newfoundland

Cardiff University

Government of Newfoundland and Labrador

University of Leicester

United States Geological Survey

Instituto de Geociencias

Geological Survey of Canada

University of Alberta

University of Nottingham

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Architecture of the Oman–UAE Ophiolite: Evidence for a Multi-Phase Magmatic History

Frontiers in earth sciences (2012)

Kathryn Goodenough M. T. Styles David Schofield R. J. Thomas Quentin Crowley

10.1007/978-3-642-30609-9_2

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Citations (1)

Tectonic evolution of high grade metamorphic tectonites of the Meelpaeg structure near Port aux Basques, southwestern Newfoundland during the Silurian Salinic and Early to Middle Devonian Acadian orogenies

Canadian Journal of Earth Sciences (2024)

Cees R. van Staal Shoufa Lin Pablo Valverde-Vaquero Greg Dunning James Howard Burgess

The Meelpaeg structure in southwestern Newfoundland comprises allochthonous tectonites formed during the Salinic (D 1-2 ) and Acadian (D 3 ) orogenies. D 1-2 occurred between 451 and 417 Ma and culminated in Barrovian metamorphism during terminal collision of the Gander margin with composite Laurentia. Collision was followed by tectonic escape of the deeply buried rocks between 417 and 412 Ma. Rocks of the Victoria arc and Exploits backarc preserved in the Port aux Basques and Grand Bay complexes were emplaced during D 1 by the Grandys River shear zone, which is outlined by a narrow band of the ca. 451 Ma Port aux Basques granite, towards the southeast above the Harbour le Cou Group. The contrasting histories displayed across the Grandys River shear zone are typical of the Dog Bay Line further northeast. Salinic structures were overprinted by faults and folds formed during Acadian D 3 transpression (≤412 Ma), which produced the bi-vergent Meelpaeg structure and emplacement of amphibolite facies tectonites above greenschist facies rocks along its bounding shear zones. F 3 folding progressively steepened the faults, which in turn led to progressive localization of dextral strike–slip in narrow fault zones. The high grade of metamorphism in the Meelpaeg structure is attributed to protracted underthrusting of the Cabot promontory of the Gander margin beneath composite Laurentia. Salinic convergence was sinistral but became dextral during the Early Devonian, diachronous Acadian orogeny. The kinematic switch is proposed as a tool to separate Salinic from Acadian structures in the central part of the northern Appalachians.

Tectonite

Devonian

10.1139/cjes-2023-0141

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Citations (3)

Plio‐Pleistocene fault reactivation within the Crag Basin, easternUK: implications for structural controls of landscape development within an intraplate setting

Boreas (2020)

Jonathan R. Lee Richard Haslam Mark A. Woods James Rose R. Graham

This study examines the long‐term neotectonic evolution of the Crag Basin of eastern England during the Plio‐Pleistocene ( c . 4.0–0.48 Ma) and the influence of neotectonics on coastal and drainage development. The Crag Basin was situated within the western margins of the southern North Sea with palaeogeography influenced by changes in global sea‐level and longer‐term regional‐scale neotectonic uplift and subsidence. This study identifies an additional local‐scale neotectonic control on basin development with localized crustal displacement occurring along normal faults. Plio‐Pleistocene movement along these faults was accommodated by partial dip‐slip (normal) reactivation of an Oligocene‐age (Pyrenean) dextral strike‐slip shear zone, which in turn was inherited from much older Caledonian orogenic crustal structure. Fault displacement was driven by sediment‐loading reflecting enhanced landscape denudation under progressively deteriorating climates and increased rates of erosion/sedimentation. Faulting acted to regulate accommodation space, controlling sedimentation patterns and the courses of major preglacial drainage systems including the Kesgrave Thames and Bytham rivers. The lower reaches of both river systems are considered to have been confluent in the Crag Basin during much of the Early Pleistocene with their lower reaches structurally controlled. Divergence occurred at c . 0.9 Ma with the lower reaches of the Bytham utilizing the former Bytham‐Thames valley and the Kesgrave Thames adopting progressively more southern routes, aligned to the axis of subsidence within the London Basin. The study highlights the significance of tectonic inheritance in driving recent neotectonic crustal deformation and its influence on sedimentation patterns and drainage development within an intraplate setting.

Neotectonics

Plio-Pleistocene

Tectonic uplift

10.1111/bor.12462

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Citations (2)

Cambrian successions of the Meguma Terrane, Nova Scotia, and Harlech Dome, North Wales: dispersed fragments of a peri-Gondwanan basin?

Journal of the Geological Society (2011)

John W.F. Waldron David Schofield Chris E. White Sandra M. Barr

Abstract: The Meguma Terrane of Nova Scotia and the Harlech Dome of North Wales preserve similar sedimentary successions of Cambrian age. Both successions comprise a thick succession of early Cambrian sandstone turbidites, overlain by early to middle Cambrian alternating mud-rich and sand-rich units in which manganese is concentrated in two stratigraphic intervals. Above these, both successions comprise anoxic, organic-rich turbidites, shallowing upward into paler, more bioturbated Tremadocian mudstone with Rhabdinopora . Within the limited constraints of the available biostratigraphic and geochronological data, major changes in environment occurred synchronously in the two successions. Both successions show much greater similarity to each other than to adjacent successions on ‘Avalonia'. A detrital zircon analysis from the Rhinog Formation, low in the Harlech Dome succession, reveals distinct clusters of ages around 537 Ma and 2.0–2.1 Ga. A close similarity to analyses from the Meguma Terrane suggests proximity between the two terranes on the margin of Gondwana during the Cambrian Period. We suggest the term Megumia for the palaeogeographical domain that included the two successions, which was dispersed during subsequent Appalachian and Caledonian movements. These observations suggest that Megumia may have separated terranes previously regarded as parts of Avalonia. Supplementary material: U/Pb detrital zircon analytical data are available at http://www.geolsoc.org.uk/SUP18431 .

Nova scotia

Dome (geology)

Breccia

10.1144/0016-76492010-068

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Citations (86)

Architecture of the Oman–UAE ophiolite: evidence for a multi-phase magmatic history

Arabian Journal of Geosciences (2010)

Kathryn Goodenough M. T. Styles David Schofield Robert James Thomas Quentin Crowley

Ultramafic rock

Felsic

Magma chamber

10.1007/s12517-010-0177-3

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Citations (73)

Cover sequences at the northern margin of the Antongil Craton, NE Madagascar

Precambrian Research (2011)

Wilfried Bauer Gregory J. Walsh Bert De Waele Robert J. Thomas Matthew Horstwood

Basement

Conglomerate

Felsic

10.1016/j.precamres.2011.07.018

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Citations (28)

Tectonic evolution of Anglesey and adjacent mainland North Wales

Geological Society London Special Publications (2020)

David Schofield A. Graham Leslie Philip R. Wilby Rosemary Dartnall John W.F. Waldron

Abstract The Appalachian–Caledonian Orogen preserves a complex record of piecemeal trans-oceanic terrane transfer and accretion during the early Paleozoic collision between West Gondwana and Laurentia, whilst the intervening Iapetus oceanic tracts were largely destroyed. The now preserved terranes include arc fragments of Laurentian and Gondwanan affinity, oceanic fragments incorporated into the Gondwanan continental margin, and remnants of the Gondwanan continental slope apron and adjacent platform (both Ganderia and Megumia). A new tectonostratigraphic synthesis for the island of Anglesey (and adjacent NW Wales) reveals a comprehensive record of the Appalachian orogenic cycle in the UK segment of the orogen of the peri-Gondwanan margin prior to amalgamation into the Laurentian margin. We identify elements of Late Neoproterozoic accretion forming the pre-Appalachian basement; Cambrian extension, deposition and continental margin growth; Early Ordovician accretion and renewed extension; and, finally, terminal Caledonian collision and continental foreland-basin development.

Mainland

10.1144/sp503-2020-9

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Citations (11)

Geology of the Lampeter district : a brief explanation of the geological map Sheet 195 Lampeter

Jeremy Davies David Schofield H. L. Sheppard R.A. Waters Mark Williams

Geologic map

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Citations (1)

Provenance and tectonic significance of the Palaeoproterozoic metasedimentary successions of central and northern Madagascar

Precambrian Research (2011)