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Age of the Jamaican Granodiorite

Published online by Cambridge University Press:  01 May 2009

L. J. Chubb  and
Kevin Burke
L. J. Chubb
Affiliation:
Geological Survey of Jamaica, Hope Gardens, Kingston 6, Jamaica.
Kevin Burke
Affiliation:
Geology Department, University of the West Indies, Mona, Kingston 7, Jamaica.
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Abstract

Granodiorite intrusions in Jamaica were assigned by early workers to various ages from Pre-Cambrian to late Tertiary. Recent surveys have shown that the granodiorite intrudes Maestrichtian sediments and has provided material for pebbles in an Eocene conglomerate. Its age is therefore very late Cretaceous or very early Tertiary. Radio-metric determinations using Potassium/Argon; Rubidium/Strontium and isotopic lead methods suggest an age of 65 ± 5 million years.

Type
Articles
Information
Geological Magazine , Volume 100 , Issue 6 , December 1963 , pp. 524 - 532
Copyright
Copyright © Cambridge University Press 1963

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