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Title: The Upper Palaeozoic to Mesozoic structural evolution of the North Staffordshire coalfield and adjoining areas.
Author: Corfield, Stephen Martin.
ISNI:       0000 0001 3562 759X
Awarding Body: University of Keele
Current Institution: Keele University
Date of Award: 1991
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The main aims of the project were to undertake a detailed structural study of the North Staffordshire coalfield and to assess the influence of the major structures on the subsidence history using an extensive data set of British Coal mine plans and bo~eholes, British Coal opencast sites and seismic reflection profiles supplied by Fina Exploration Ltd, Hamilton Bros Oil and Gas, Edinburgh Oil and Gas? and Shell U.K. The extraction of over 45 coal seams over a vertical thickness of lkm. has resulted in the detailed description of the 3-D geometry of the folds and both small-scale faults (down to 0.5m. throw) and large scale faults (up to bOOm throw). This work has been supplemented by visits to opencast coal mines? where minor structures observed include abundant small thrusts and folds. A cored interval through a fault of 300m. throw has also been examined. This structural analysis has been extended on a regional scale using the extensiVE seismic database. The subsidence history of the basin has been studied using inter-seam isopach maps compiled from borehole records and mine plans. The results of this work indicate that the Westphalian sequence thins dramatically (up to 50%) over the folds. The reduction in thickness is accompanied by the amalgamation of a number of coal seams. The restoration of detailed serial cross-sections of the anticlines compiled from mine plans indicates that the thinning occurs in discrete intervals that record periods of fold growth. Late Westphalian D inversion resulted in the formation of major (km. scale) folds with N-S and NE-SW trending axes. The orientation of the folds was strongly influenced by the trends of pre-existing basement lineaments. The lineaments are oriented at high angles to the NNW directed thrusts of the Variscan front of southern Britain. The folds are post-dated by large NNW trending normal faults with throws up to bOOm. The faults are predominantly planar, hig~-angle structures and lack evidence of syn-depositional activity. They are related to Permian/Triassic extension of the Cheshire Basin to the NW and the Stafford basin to the S of the coalfield.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Geology