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Ultramafic nodules and their host rocks from Auckland, New Zealand

Published online by Cambridge University Press:  01 May 2009

K. A. Rodgers ,
R. N. Brothers  and
E. J. Searle
K. A. Rodgers
Affiliation:
Department of GeologyUniversity of AucklandPrivate BagAuckland 1New Zealand
R. N. Brothers
Affiliation:
Department of GeologyUniversity of AucklandPrivate BagAuckland 1New Zealand
E. J. Searle
Affiliation:
Department of GeologyUniversity of AucklandPrivate BagAuckland 1New Zealand
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Summary

Ultramafic and mafic nodules are abundant inclusions in Cainozoic alkali basalts at 7 localities in the Auckland Province. Nodule types show a gradation from dunites and pyroxenites through periodotites to eucrites. Bulk chemical variations in the nodules show a wide range in MgO/ΣFeO with a tendency for Al2O3, ΣFeO, CaO and Na2O + K2O to increase as this ratio decreases. These chemical trends, together with published data on the nodules mineralogy and fabric, are consistent with their being interpreted as fragments of the upper mantle.

Type
Articles
Information
Geological Magazine , Volume 112 , Issue 2 , March 1975 , pp. 163 - 174
Copyright
Copyright © Cambridge University Press 1975

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