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Geological Society, London, Special Publications; 1988; v. 39; p. 283-292;
DOI: 10.1144/GSL.SP.1988.039.01.26
© 1988 Geological Society of London

Volcanism in Basins to the N and W of the British Isles

Distribution of early Tertiary lavas in the NE Rockall Trough

M. V. Wood1, J. Hall2 & J. J. Doody1

1 Department of Geology, University of Glasgow, G12 8QQ, UK
2 Department of Earth Sciences, Memorial University of Newfoundland, Newfoundland, Canada AB1 3X7

A study of lavas of early Tertiary age in NE Rockall Trough has revealed that they can be classified on the basis of their seismic reflection character and their relationship with the overlying Tertiary sediments. The lavas have been mapped using commercial seismic reflection data. Our interpretation of the areal distribution of the subaerial flows has major implications for the subsidence history of the area. Three seismic facies are recognized:

(1) High amplitude parallel reflections in laterally continuous sheets with steep edges.
(2) Basinward-thinning wedges of high-amplitude discontinuous reflections.
(3) A single high-amplitude reflection underlain by a zone of small diffractions.

These are interpreted respectively as subaerial flows, hyaloclastite deposits derived from the basalts, and tuffs.

Throughout the sedimentary sequence below the lavas, high amplitude, subhorizontal reflection packages occur. These are interpreted as sills of early Tertiary age intruding Mesozoic sediments. In places, the lavas themselves are intruded by seismically translucent bodies of up to a few kilometres across. These may represent small centres of lava extrusion.





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