A study of the relation between jointing and structural evolution

Roberts, John C.

doi:10.1002/gj.3350050113

Cited by 11 publications

(3 citation statements)

References 13 publications

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“…This demonstrate how poor data coverage may cause misinterpretations of fault zones as folds, due to their fold-like geometries at lower resolutions. (Roberts 1966(Roberts , 1975Dixon & Strahan 1977;Roberts 1979;Wright et al 2009;Woodcock et al 2014;Morgan 2015) (c) Post-Variscan to Mesozoic extensional regime. (Roberts 1966(Roberts , 1975(Roberts , 1979Nemčok et al 1995;Glen et al 2005;Morgan 2015) (d) Alpine compressive regime, specifically the Pyrenean Phase (Parrish et al 2018).…”

Section: Discussionmentioning

confidence: 99%

“…(Roberts 1966(Roberts , 1975Dixon & Strahan 1977;Roberts 1979;Wright et al 2009;Woodcock et al 2014;Morgan 2015) (c) Post-Variscan to Mesozoic extensional regime. (Roberts 1966(Roberts , 1975(Roberts , 1979Nemčok et al 1995;Glen et al 2005;Morgan 2015) (d) Alpine compressive regime, specifically the Pyrenean Phase (Parrish et al 2018). Additional sources include: (Skempton et al 1969;Ameen & Cosgrove 1990;Nemčok et al 1995;Belayneh & Cosgrove 2004;Glen et al 2005 Fig.…”

Section: Discussionmentioning

confidence: 99%

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Major faulting in London: evidence for inherited basement faults in the London Basin

Morgan

Ghail

Lawrence

2020

QJEGH

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The near-surface of London is faulted, although the locations, architecture and tectonic origins of the faults are broadly unknown. This presents serious issues for geotechnical engineering in London and has implications for our structural understanding of the London Basin. The region is a product of Alpine compression, yet it is unclear whether these major faults are new Alpine shears or reactivated basement faults. We assess the plausibility of Alpine reactivation and inheritance of basement faults in London through three investigations: analysing structures in the near-surface; mechanically assessing the feasibility of basement fault reactivation under Alpine stress conditions; and comparing inheritance mechanisms with observations in London and the Thames Estuary. Three major en echelon fault sets are identified. These appear to have compartmentalized London's near-surface geology and are all interpreted to be products of Alpine reactivation of the underlying basement faults. Fault interaction and linkage is evidenced by complex zones of intense faulting identified by tunnelling projects. The role of new structural development in accommodating Alpine compression is considered to have been comparatively minor. The lack of major faulting in the basin's interior may reflect the competence of the underlying Anglo–Brabant Massif in restricting Alpine strains to its margins.Thematic collection: This article is part of the Geology of London and its implications for ground engineering collection available at: https://www.lyellcollection.org/cc/london-basin

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Major faulting in London: evidence for inherited basement faults in the London Basin

Morgan

Ghail

Lawrence

2020

QJEGH

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“…The purpose of this investigation was to record azimuths of joint planes and minor faults, and to ascertain whether or not a systematic joint pattern existed within the area. Regional joint patterns are known to exist elsewhere in South Wales (Roberts, 1966(Roberts, , 1974 and a close relationship between jointing and macrostructures has been established. All of the observations recorded in this article were made in rocks of Carboniferous age, with the majority of data being recorded from Avonian limestones.…”

Section: Introductionmentioning

confidence: 99%

Jointing and minor tectonics of the S. Crop of the South Wales Coalfield between Machen and Bridgend

Roberts¹

1975

Geological Journal

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0 bservations on joints, minor faults and mineral veins at 47 localities along the south and south east crop of the S. Wales Coalfield indicate the presence of a joint system comprised of up to 6 sets of fractures striking at 350", 330", 2!W, 270". 250" and 210". The joint sets are parallel to minor faults of strike and dip-slip types, whilst minor thrust faults indicate an early phase of sub-horizontal compression. The joint system is thought to be of tectonic origin and developed early in the deformational history of the area in response to a N-S compression. Later, dilational episodes facilitated the infilling of mineral veins, with the W.N.W. trending set probably indicating the latest phase of dilation in the area. All structures arc considered to be of Armorican age, whilst the marked similarity in the orientation of the joint system to that of the North Crop of the Coalfield suggests that the brittle deformation was relatively homogeneous on both flanks of the Coalfield.

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Minor thrust faults in the Avonian of the North Crop of the South Wales Coalfield

Roberts

1972

Geological Journal

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A study of the relation between jointing and structural evolution

Cited by 11 publications

References 13 publications

Major faulting in London: evidence for inherited basement faults in the London Basin

Major faulting in London: evidence for inherited basement faults in the London Basin

Jointing and minor tectonics of the S. Crop of the South Wales Coalfield between Machen and Bridgend

Minor thrust faults in the Avonian of the North Crop of the South Wales Coalfield

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