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Journal of the Geological Society; 1993; v. 150; issue.6; p. 1043-1046;
DOI: 10.1144/gsjgs.150.6.1043
© 1993 Geological Society of London

Article

Seismic reflections from within the Lake District batholith, Cumbria, northern England

D. J. EVANS1, W. J. ROWLEY1, R. A. CHADWICK1 & D. MILLWARD2

1 British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
2 British Geological Survey, Windsor Court, Windsor Terrace, Newcastle Upon Tyne NE2 4HB, UK

Seismic reflection data from the Wasdale area, Cumbria, reveal reflector-poor and reflector-rich areas within components of the Lake District batholith. A representative panel of seismic data crossing the western boundary of the intrusion has been modelled with synthetic seismograms. The preferred model indicates that the Ennerdale Granophyre is a sheet-like body some 1100 m thick. Beneath this, the batholith comprises multiple poorly-reflective laccolithic granitic intrusions, interfingered with moderately reflective wedges of country rock, to give the steep western margin of the granite complex a 'cedar-tree' profile. Within the main body of the batholith, reflector-rich zones may arise from either areas of included country rock, basic sills or zones of mafic material within granite.




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