The kinematic linkage of the Dent, Craven and related faults of Northern England

Thomas, C. W. and Woodcock, N. H. (2015) The kinematic linkage of the Dent, Craven and related faults of Northern England. Proceedings of the Yorkshire Geological Society, 60 (4). pp. 258-274. ISSN 0044-0604, 2041-4811 DOI 10.1144/pygs2015-358

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Abstract

New mapping of the southern part of the Dent Fault reveals three segments, each 5–6 km long, overlapping at two left-stepping zones 1–2 km wide. The main fault strands probably dip steeply WNW. A faulted footwall syncline in Carboniferous strata indicates reverse dip-slip, with a stratigraphic throw of at least 750 m. Locally developed plunging folds and imbricate fault duplexes developed at fault bends reveal a strike-slip component, indicated to be sinistral from limited slickenline data. Silurian strata in the hanging wall lack the Variscan folds observed further north. The northern overstep hosts up-faulted slivers of older Silurian and Ordovician rocks. The southern overstep zone hosts a younger faulted block compatible with releasing kinematics in sinistral strike-slip. The Dent Fault converges at its southern end with the Barbon Fault; an upfaulted wedge of Silurian strata lies between them near the branch point. The two faults swing southeastward, joining the Craven fault system via splays and linkages. Regionally, the Dent and Barbon faults form the innermost pair of a fan of ~N–S striking faults splaying off the northwest end of the South Craven–Morley-Campsall Fault System around the southwestern corner of the Askrigg Block. The kinematics of the Dent, Barbon and Craven faults fit shortening orientated NNW–SSE during late Carboniferous Variscan deformation. The rigid Askrigg Block focussed displacements around its west and south margins where fault and fold orientations were influenced by pre-existing structures, at least Acadian in age to the west and early Carboniferous to the south. Zones of transpression in the Earth’s crust result in complex coupled fault and fold architectures in which displacements are typically partitioned into domains dominated either by strike-slip or dip-slip (Sanderson & Marchini 1984; Fossen & Tikoff 1993; Jones & Tanner 1995; Holdsworth et al. 2002; Woodcock & Rickards 2003a). Structures developed in such zones vary along their length, particular complexities arising at restraining and releasing bends and offsets and at the tips of major faults, where strain is often accommodated by fanning arrays and duplexes of subsidiary faults (Woodcock & Fischer 1986). Previous studies have demonstrated such complexity arising from Variscan sinistral transpression along the northern sector of the Dent Fault of Northern England (Underhill et al. 1988; Woodcock & Rickards 2003a; Fig. 1). The fault is of particular interest because it provides an easily accessible and locally well-exposed example of a transpressive structure (Underhill et al. 1988; Woodcock & Rickards 2003a) and because it hosts informative fault breccias (Tarasewicz et al. 2005; Mort & Woodcock 2008; Woodcock & Mort 2008; Woodcock et al. 2008).

Item Type: Article
Uncontrolled Keywords: 2015AREP; IA71
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Proceedings of the Yorkshire Geological Society
Volume: 60
Page Range: pp. 258-274
Identification Number: 10.1144/pygs2015-358
Depositing User: Sarah Humbert
Date Deposited: 09 Dec 2016 18:16
Last Modified: 09 Dec 2016 18:16
URI: http://eprints.esc.cam.ac.uk/id/eprint/3777

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