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Journal of the Geological Society; 1997; v. 154; issue.3; p. 517-521;
DOI: 10.1144/gsjgs.154.3.0517
© 1997 Geological Society of London

Article

Geological implications from geochemical and isotopic studies of Upper Cretaceous and Lower Tertiary igneous rocks around the northern Rockall Trough

K. HITCHEN1, A. C. MORTON2, E. W. MEARNS3, M. WHITEHOUSE4 & M. S. STOKER1

1 Marine Geology & Operations Group, British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3 LA, UK (e-mail: k.hitchen{at}bgs.ac.uk)
2 Biostratigraphy & Sedimentology Group, British Geological Survey, Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, UK
3 Isotopic Analytical Services, Aberdeen Science & Technology Park, Balgownie Road, Aberdeen AB22 8GW, UK
4 Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK

Major, trace, rare-earth element geochemistry and isotopic data have been obtained for offshore igneous rocks from around the northern Rockall Trough, NE Atlantic Ocean. Most comprise basalts derived from the sub Rockall-Hebridean asthenospheric mantle, but subcontinental lithospheric mantle generated the phono-tephrites of Rosemary Bank, and melting of upper crust was responsible for the peraluminous dacites of well 163/6-1A. Crustal contamination of the lavas around the Rockall Trough suggests that the Lewisian-Islay (Rockall Bank) basement terrane boundary crosses the trough and passes between George Bligh and Rockall Banks. Basalts representing uncontaminated mantle-derived material are scarce, but the available data indicate that the Cretaceous basalts of Rosemary Bank and Anton Dohrn have higher 206Pb/204Pb ratios than the younger Palaeocene lavas of Rockall Bank, the Hebrides Shelf and well 163/6-1A, implying significant geographic and/or temporal changes in mantle composition.


Keywords: Rockall Trough, continental margin, volcanics, geochemistry, isotopes.




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