|
Article |
1 British Geological Survey, Key worth, Nottingham NG12 5GG, UK
2 Tricentrol Exploration UK Ltd, 3 Finsbury Square, London EC2A 1AH, UK
An 18 km long N–S seismic reflection profile has been acquired across the faulted boundary between the Alston Block and the Northumberland Trough. A NW–SE geological cross-section has been constructed across the trough by integrating this line with other data, and a Tricentrol seismic profile confirms the suitability of this model. The trough has a markedly asymmetric form, with a thickness of more than 4.2 km of Dinantian strata adjacent to its faulted southern margin. The present day surface faults (Stublick, Ninety Fathom) are related to Variscan and later inversion and transpression, and do not everywhere correspond precisely to the earlier syn-depositional normal faults. The basin is believed to have formed in response to reactivation of the Iapetus Suture in a dominantly N–S extensional stress field. Basin evolution has been analysed by fault restorations and subsidence modelling. The fault restorations indicate an upper crustal extension factor of 1.15 to 1.19. Subsidence modelling indicates a whole crustal extension factor of 1.30, with similar sub-crustal lithospheric extension. It is possible that the difference between the inferred extension factors is due to non-uniform (increasing downwards) lithospheric extension, but the uncertainties inherent in both methods are such that this cannot yet be confirmed.
This article has been cited by other articles:
 |
|
 |
|
  N. De Paola, R. E. Holdsworth, C. Collettini, K. J. W. Mccaffrey, and M. R. Barchi The structural evolution of dilational stepovers in regional transtensional zones Geological Society, London, Special Publications, 2007; 290: 433 - 445. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 K.J.W. McCaffrey, R.R. Jones, R.E. Holdsworth, R.W. Wilson, P. Clegg, J. Imber, N. Holliman, and I. Trinks Unlocking the spatial dimension: digital technologies and the future of geoscience fieldwork Journal of the Geological Society, 2005; 162: 927 - 938. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
N. de Paola, R.E. Holdsworth, and K.J.W. McCaffrey The influence of lithology and pre-existing structures on reservoir-scale faulting patterns in transtensional rift zones Journal of the Geological Society, 2005; 162: 471 - 480. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 References Geological Society, London, Memoirs, 2003; 28: 73 - 76. [PDF]
|
|
|
|
|
|
References Geological Society, London, Memoirs, 2002; 25: 297 - 319. [PDF]
|
|
|
|
|
|
J. Ward Early Dinantian evaporites of the Easton-1 well, Solway Basin, onshore, Cumbria, England Geological Society, London, Special Publications, 1997; 124: 277 - 296. [Abstract] [PDF]
|
|
|
|
|
|
T. B. Anderson, J. Parnell, and A. H. Ruffell Influence of basement on the geometry of Permo-Triassic basins in the northwest British Isles Geological Society, London, Special Publications, 1995; 91: 103 - 122. [Abstract] [PDF]
|
|
|
|
|
|
R.A. CHADWICK, D.J. EVANS, and D.W. HOLLIDAY The Maryport fault: the post-Caledonian tectonic history of southern Britain in microcosm Journal of the Geological Society, 1993; 150: 247 - 250. [Abstract] [PDF]
|
|
|
|
|
|
K. SMITH Carboniferous magmatism in the Iapetus convergence zone: evidence from deep seismic reflection profiles Journal of the Geological Society, 1992; 149: 907 - 914. [Abstract] [PDF]
|
|
|
|
|
|
R. A. CHADWICK and D. W. HOLLIDAY Deep crustal structure and Carboniferous basin development within the Iapetus convergence zone, northern England Journal of the Geological Society, 1991; 148: 41 - 53. [Abstract] [PDF]
|
|
|
|
|
|
A. J. Fraser and R. L. Gawthorpe Tectono-stratigraphic development and hydrocarbon habitat of the Carboniferous in northern England Geological Society, London, Special Publications, 1990; 55: 49 - 86. [Abstract] [PDF]
|
|
