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Journal of the Geological Society; 1994; v. 151; issue.4; p. 587-590;
DOI: 10.1144/gsjgs.151.4.0587
© 1994 Geological Society of London

Article

Timing and significance of crosscourse mineralization in SW England

R. C. SCRIVENER1, D. P. F. DARBYSHIRE2 & T. J. SHEPHERD3

1 British Geological Survey, St Just, 30 Pennsylvania Road, Exeter EX4 6BX, UK
2 NERC Isotope Geosciences Laboratory, Kingsley Dunham Centre, Keyworth NG12 5GG, UK
3 British Geological Survey, Kingsley Dunham Centre, Keyworth NG12 5GG, UK

Rb-Sr isotope analyses of inclusion fluids from quartz have demonstrated a Triassic age (236 ± 3 Ma) for N–S-trendmg Pb–Zn–F vein mineralization in the Tamar Valley district of the Cornubian orefield. Consideration of the stratigaphy and structure of the Permo-Triassic basins both onshore and in the English Channel suggest that this mineralization results from the formation of fractures during regional extension-driven subsidence, and the subsequent ingress of basinal brines to the Variscan basement.





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