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Journal of the Geological Society; 1986; v. 143; issue.1; p. 135-139;
DOI: 10.1144/gsjgs.143.1.0135
© 1986 Geological Society of London

Article

Seismic refraction investigation of the structural setting of the Lizard and Start complexes, SW England

J. J. DOODY1 & M. BROOKS

Department of Geology, University College, P.O. Box 78, Cardiff CF1 1XL, UK.
1 Now at Department of Geology, The University, Glasgow G12 8QQ, UK

A long refraction line was established between the Lizard and Start peninsulas during a large-scale seismic experiment carried out in SW England during 1979. Interpretation of first arrival data indicates a shallow crustal structure consisting of two layers of regional extent. The upper layer of average velocity 5.15 km/s is interpreted as Devonian metasediments. The underlying layer with a velocity of about 6.10 km/s lies at a depth of several kilometres beneath the Lizard complex but rises eastwards to occur at or near surface in the Eddystone and Start areas. The lower layer is believed to represent a pre-Devonian crystalline basement of which the metamorphic rocks of Start and Eddystone are constituent parts. By contrast, the Lizard complex is interpreted as a thin surface sheet overlying Devonian metasediments.




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