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Felsic plutonic rocks from the southern portion of the New Caledonian Ultramafic Belt

Published online by Cambridge University Press:  01 May 2009

K. A. Rodgers
K. A. Rodgers
Affiliation:
Department of Geology, University of Auckland, Private Bag, Auckland, New Zealand
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Summary

Granodiorite stocks were intruded into the alpine peridotites of southern New Caledonia in the Eocene following overthrusting of the ultramafics onto the sialic core of the island. Strong zoning, from mela-diorite to granodiorite, is developed in one pluton and is believed to be the result of assimilation of ultramafic and mafic rocks by the calc-alkaline magma. Evidence in favour of a consanguineous relationship between the felsic and ultramafic rocks is largely circumstantial. In their petrography, mineralogy and chemistry, the rocks show few differences from other felsic plutonics of Tertiary age in the southwest Pacific.

Type
Articles
Information
Geological Magazine , Volume 110 , Issue 5 , September 1973 , pp. 431 - 446
Copyright
Copyright © Cambridge University Press 1973

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