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The magmatic affinities of some volcanic rocks from the Tweed Shield Volcano, S.E. Queensland — N.E. New South Wales

Published online by Cambridge University Press:  01 May 2009

J. F. G. Wilkinson
J. F. G. Wilkinson
Affiliation:
Department of Geology, University of New England, Armidale, 2351, New South Wales.
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Summary

Some basaltic and andesitic rocks from the Tweed Shield Volcano are tholeiitic in character as evidenced by their chemistry and the nature of their pyroxenes inferred from optical data. A common mineral assemblage in the more basic members is olivine-clinopyroxene-plagioclase-opaques-(glass). Petrographic criteria that characterize tholeiites are often lacking, and some of the more basic lavas appear to link the more typical tholeiites with transitional olivine basalts. Many of the Tweed volcanic rocks are more potassic than similar rocks in other tholeiitic sequences. The likelihood of differing lineages in the shield area is noted.

Type
Articles
Information
Geological Magazine , Volume 105 , Issue 3 , June 1968 , pp. 275 - 289
Copyright
Copyright © Cambridge University Press 1968

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