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Strontium in plagioclase feldspars from four layered basic masses in Somalia

Published online by Cambridge University Press:  14 March 2018

J. R. Butler  and
W. Skiba
J. R. Butler
Affiliation:
Department of Geology, Imperial College, London S.W. 7
W. Skiba
Affiliation:
Department of Geology, Imperial College, London S.W. 7
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Summary

The petrological and structural characteristics of four layered basic masses in Somalia are described. Sr contents of feldspars from three of the masses are similar for comparable An contents; Sr varies between 1000 and 1850 p.p.m. and tends to increase as An decreases from An68 to An48. In feldspars from the other mass Sr also increases with decreasing An content (An74 to An56), but is at a much higher general tenure (1650 to 2350 p.p.m.). It is concluded that the four masses were not all part of the same layered intrusion.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 33 , Issue 258 , September 1962 , pp. 213 - 225
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1962

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