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Ages of uraninite and Coffinite from south-west England

Published online by Cambridge University Press:  14 March 2018

A. G. Darnley ,
T. H. English ,
O. Sprake ,
E. R. Preece  and
D. Avery
A. G. Darnley
Affiliation:
Atomic Energy Division, Geological Survey of Great Britain
T. H. English
Affiliation:
National Chemical Laboratory, Teddington, Middlesex
O. Sprake
Affiliation:
National Chemical Laboratory, Teddington, Middlesex
E. R. Preece
Affiliation:
Atomic Energy Research Establishment, Harwell, Berkshire
D. Avery
Affiliation:
Atomic Energy Research Establishment, Harwell, Berkshire
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Summary

The mode of occurrence of uraninite, pitchblende and coffinite at five localities in south-west England is described. Chemical and isotopic analyses of concentrates containing these minerals provide the following 206Pb/238U ages (My.): uraninite, South Crofty, Cornwall, 277 ± 10; uraninite, Geevor, Cornwall, 223 ± 5; pitcbblende-coffinite, King's Wood, Devon, 206 ± 5; pitchblende, Wheal Bray, Cornwall, 165 ± 4; pitchblende, South Terras, Cornwall, 474 ± 2; coffinite, Geevor, Cornwall, c. 45 (chemical analysis only). These results are compatible with geological and mineralogical evidence. Consideration of these and other results indicates that there were at least three periods of uranium mineralization in south-west England, at c. 290 My., c. 225 My., and c. 50 My. Other intermediate ages may also be valid but further work is required to substantiate these.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 34 , Issue 268 , 1965 , pp. 159 - 176
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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