Regional structural framework
Published:January 01, 2003
The pre-Permian geology of northern England and Wales (Wills 1973, 1978; Whittaker 1985; BGS 1985) is divided by lineaments and faults into a series of major terranes (Fig. 4). Turner (1949) and Wills (1973, 1978) realized that old Caledonian faults had exerted considerable influence on the geometry and orientation of subsequent tectonic features and recognized the presence of a triangular shaped platform with a thin, flatlying undeformed Palaeozoic cover underlying the English Midlands (Figs 4 and 5). The platform is bounded on its southern side by the Variscan thrust front, on its northwestern side by the Longmynd Fault and to the northeast by a NW-SE-trending lineament which Turner (1949) and Wills (1973) placed in different locations. The Longmynd Fault, in the NW, separates the platform from the deformed and cleaved Palaeozoic sediments of the Welsh Caledonides. The NE boundary represents a major lineament which separates the platform from a hidden East Midlands Caledonide belt, again with deformed and cleaved Lower Palaeozoic sediments. In this study, the boundary of Turner (1949) was found to be the more appropriate. This triangular platform is now referred to as the Midlands Microcraton (Pharaoh et al. 1987).
Turner (1949) compared the northern triangular apex of the microcraton with the Hindu Kush and suggested that the NE Caledonian trend in Wales could be traced in an
Figures & Tables
An Atlas of Carboniferous Basin Evolution in Northern England
Why an atlas of the Carboniferous in northern England? There can hardly be a more researched system in the whole of the British Isles, given its widespread distribution at outcrop and annual appearances in numerous PhD theses (including those of the authors). But perhaps all we really know about the Carboniferous is no more than skimming the surface. In this atlas, using modern multifold seismic and borehole data collected by the oil industry in its search for petroleum accumulations, we can start to look beyond the surface exposures and gain some new insights into the structure and stratigraphy of the subsurface (and surface) Carboniferous.
The unique appeal of this atlas of seismic sections is that it is based on data from onshore UK. Although these lines were originally shot as small segments targeting individual prospects and trends, they have been spliced together to produce a series of basin-scale regional lines which should be of value to academic researchers and industry alike. With this atlas, we can walk the seismic lines at outcrop and in many cases compare exposure to both the seismic data and associated palaeofacies maps.