SEISMIC REFLECTIONS FROM WITHIN THE LAKE DISTRICT BATHOLITH, CUMBRIA, NORTHERN ENGLAND

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.