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1 Department of Geology, The University, Newcastle-upon-Tyne NE1 7RU, UK
2 BIRPS, Bullard Laboratories, Madingley Road, Cambridge CB3 0EZ, UK
The NEC deep seismic reflection profile images structures in the lower crust which represent the Iapetus Suture zone beneath southern Scotland and northern England. On the basis of reflectivity characteristics of the lower crust and reflection Moho we recognize four different crustal zones which correspond to four crustal/terrane types: Midland Valley (zone A), a sub-continental subduction complex (zone B), Lake District (zone C) and Midland Platform (zone D). The junctions between each of these zones are interpreted as being tectonic. A and B originate from the northern continental margin of the Iapetus Ocean and are separated from C and D (which are derived from a southern continent) by strong northerly dipping reflections between approximately 15 and 30 km deep in the crust. The structure responsible for these reflections does not displace the reflection Moho. North of the AB/CD junction, the base of zone B (and base of the reflective crust) is marked by a pair of parallel reflectors persistent for a horizontal length of about 55 km. These reflectors are interpreted as the top and bottom of a slice of remnant oceanic crust. At their northerly limit the deepest of the two parallel reflectors transects the Moho to a depth of 6-7 km into the uppermost mantle. We suggest that their termination delimits the northerly extent of a décollement or shear zone at the present continental Moho. The shear zone was active during the late stages of Caledonian collision when mantle, originally from beneath the southern continent, underthrust old and newly created crust of the collision zone.
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|
|
|
|
|
|
References Geological Society, London, Memoirs, 2002; 25: 297 - 319. [PDF]
|
|
|
|
|
|
T. McCann, T. McCANN, and C. M. KRAWCZYK The Trans-European Fault: a critical reassessment Geological Magazine, 2001; 138: 19 - 29. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 Y. Battiau-Queney Crustal anisotropy and differential uplift: their role in long-term landform development Geological Society, London, Special Publications, 1999; 162: 65 - 74. [Abstract] [PDF]
|
|
|
|
|
|
A. R. HUTCHISON and G. J. H. OLIVER Garnet provenance studies, juxtaposition of Laurentian marginal terranes and timing of the Grampian Orogeny in Scotland Journal of the Geological Society, 1998; 155: 541 - 550. [Abstract] [PDF]
|
|
|
|
 |
|
 H. Roper Origin of the 'Berwick Monocline': geometrical and geophysical considerations Scottish Journal of Geology, 1997; 33: 133 - 148. [Abstract] [PDF]
|
|
|
|
|
|
P. STONE, G. S. KIMBELL, and P. J. HENNEY Basement control on the location of strike-slip shear in the Southern Uplands of Scotland Journal of the Geological Society, 1997; 154: 141 - 144. [Abstract] [PDF]
|
|
|
|
|
|
T.I.M. NEEDHAM and R. MORGAN The East Irish Sea and adjacent basins: new faults or old? Journal of the Geological Society, 1997; 154: 145 - 150. [Abstract] [PDF]
|
|
|
|
|
|
R. W. England and N. J. Soper Lower crustal structure of the East Irish Sea from deep seismic reflection data Geological Society, London, Special Publications, 1997; 124: 61 - 72. [Abstract] [PDF]
|
|
|
|
|
|
T. B. ANDERSON and G. J. H. OLIVER Xenoliths of Iapetus Suture mylonites in County Down lamprophyres, Northern Ireland Journal of the Geological Society, 1996; 153: 403 - 407. [Abstract] [PDF]
|
|
|
|
|
|
C. BROWN and J.P. WHELAN Terrane boundaries in Ireland inferred from the Irish Magnetotelluric Profile and other geophysical data Journal of the Geological Society, 1995; 152: 523 - 534. [Abstract] [PDF]
|
|
|
|
|
|
J. Brodie and N. White The link between sedimentary basin inversion and igneous underplating Geological Society, London, Special Publications, 1995; 88: 21 - 38. [Abstract] [PDF]
|
|
|
|
|
|
D.T. NEEDHAM The structure of the western part of the Southern Uplands of Scotland Journal of the Geological Society, 1993; 150: 341 - 354. [Abstract] [PDF]
|
|
|
|
 |
|
 M. P. COWARD The effect of Late Caledonian and Variscan continental escape tectonics on basement structure, Paleozoic basin kinematics and subsequent Mesozoic basin development in NW Europe Geological Society, London, Petroleum Geology Conference series, 1993; 4: 1095 - 1108. [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]
|
|
|
|
|
|
M. FORD, S. L. KLEMPERER, and P. D. RYAN Deep structure of southern Ireland: a new geological synthesis using BIRPS deep reflection profiling Journal of the Geological Society, 1992; 149: 915 - 922. [Abstract] [PDF]
|
|
|
|
|
|
N. J. SOPER, R. W. ENGLAND, D. B. SNYDER, and P. D. RYAN The Iapetus suture zone in England, Scotland and eastern Ireland: a reconciliation of geological and deep seismic data Journal of the Geological Society, 1992; 149: 697 - 700. [Abstract] [PDF]
|
|
|
|
|
|
A. P. M. VAUGHAN and J. D. JOHNSTON Structural constraints on closure geometry across the Iapetus suture in eastern Ireland Journal of the Geological Society, 1992; 149: 65 - 74. [Abstract] [PDF]
|
|
|
|
|
|
A. G. Dore Synoptic palaeogeography of the Northeast Atlantic Seaway: late Permian to Cretaceous Geological Society, London, Special Publications, 1992; 62: 421 - 446. [Abstract] [PDF]
|
|
|
|
|
|
S. P. TODD, F. C. MURPHY, and P. S. KENNAN On the trace of the Iapetus suture in Ireland and Britain Journal of the Geological Society, 1991; 148: 869 - 880. [Abstract] [PDF]
|
|
|
|
|
|
B. LE GALL Crustal evolutionary model for the Variscides of Ireland and Wales from SWAT seismic data Journal of the Geological Society, 1991; 148: 759 - 774. [Abstract] [PDF]
|
|
|
|
|
|
D. J. BLUNDELL, R. W. HOBBS, S. L. KLEMPERER, R. SCOTT-ROBINSON, R. E. LONG, T. E. WEST, and E. DUIN Crustal structure of the central and southern North Sea from BIRPS deep seismic reflection profiling Journal of the Geological Society, 1991; 148: 445 - 457. [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]
|
|
|
|
|
|
S. L. KLEMPERER, P. D. RYAN, and D. B. SNYDER A deep seismic reflection transect across the Irish Caledonides Journal of the Geological Society, 1991; 148: 149 - 164. [Abstract] [PDF]
|
|
|
|
|
|
D. J. BLUNDELL Seismic images of continental lithosphere: President's anniversary address 1989 Journal of the Geological Society, 1990; 147: 895 - 913. [Abstract] [PDF]
|
|
|
|
|
|
P. R. DIXON, A. P. LeHURAY, and D. M. RYE Basement geology and tectonic evolution of Ireland as deduced from Pb isotopes Journal of the Geological Society, 1990; 147: 121 - 132. [Abstract] [PDF]
|
|
|
|
|
|
M. P. Coward The Precambrian, Caledonian and Variscan framework to NW Europe Geological Society, London, Special Publications, 1990; 55: 1 - 34. [Abstract] [PDF]
|
|
|
|
|
|
M. F. THIRLWALL Short Paper: Movement on proposed terrane boundaries in northern Britain: constraints from Ordovician-Devonian igneous rocks Journal of the Geological Society, 1989; 146: 373 - 376. [Abstract] [PDF]
|
|
|
|
|
|
S. L. KLEMPERER Short Paper: Seismic reflection evidence for the location of the Iapetus suture west of Ireland Journal of the Geological Society, 1989; 146: 409 - 412. [Abstract] [PDF]
|
|
