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Olivine, pyroxene, feldspar, and spinel in ultramafic nodules from Auckland, New Zealand

Published online by Cambridge University Press:  05 July 2018

K. A. Rodgers  and
R. N. Brothers
K. A. Rodgers
Affiliation:
Geology Department, University of Auckland, New Zealand
R. N. Brothers
Affiliation:
Geology Department, University of Auckland, New Zealand
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Summary

Chemical, optical, and X-ray data are presented for forsteritic olivine, bronzite-enstatite, diopsidic augite, anorthite, and spinel from ultramafic nodules at seven localities in Auckland province. Olivine has a composition range from Fo79–93 for large primary crystals to Fo80–100 for smaller interstitial grains. Orthopyroxenes (En83–96) carry exsolution lamellae of clinopyroxene parallel to (100); clinopyroxenes are mainly diopsidic augites with exsolved bronzite. The plagioclase (An97) has high-temperature characteristics and a lattice structure probably transitional between primitive and body-centred anorthite. Spinels include chromite, picotite, ceylonite, hercynite, and magnetite. Element distribution indicates that the ultramafic assemblages attained equilibrium at temperatures near 1250 °C and at moderate pressures, corresponding to the melting interval of anhydrous basaltic magmas within the uppermost mantle.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 287 , September 1969 , pp. 375 - 390
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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