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Geochemistry of plutonic spinels from the North Kamchatka Arc: comparisons with spinels from other tectonic settings

Published online by Cambridge University Press:  05 July 2018

Pavel K. Kepezhinskas ,
Rex N. Taylor  and
Hisao Tanaka
Pavel K. Kepezhinskas
Affiliation:
Institute of Lithosphere, Russian Academy of Sciences, Staromonetny per., 22, Moscow 109180, Russia
Rex N. Taylor
Affiliation:
Department of Geology, University of Southampton, Southampton, U.K.
Hisao Tanaka
Affiliation:
Department of Earth Sciences, Yamagata University, Yamagata, Japan
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Abstract

Ultramafic to marie plutons in the Olyutor Range, North Kamchatka, represent the magmatic roots of a late Eocene arc, related to the westward subduction of the Komandorsky Basin beneath the Asian continental margin. Olyutor Range plutons are concentrically zoned with cumulate dunite cores mantled by a wehrlite-pyroxenite transitional zone and, in turn, by a narrow gabbroic rim.

Spinel is a common accessory mineral in these arc plutonics, and we present analyses of spinels from a range of lithologies. A continuous compositional trend is observed from Cr-spinel in the ultramafics to Cr-rich magnetite in marginal gabbros. Complex chemical zoning patterns within individual spinel grains suggest an interplay between fO2, fractionation, volatile content and subsequent sub-solidus reequilibration of spinel with co-existing silicates (mainly olivine).

In general, the spinels from magmatic arc environments are characterised by high total Fe and high Fe3+ contents compared to MORB and boninitic spinels and higher Cr-values relative to oceanic basin spinels. These differences imply a high oxygen fugacity during arc petrogenesis. Differences are also observed between plutonic spinels from arcs and low-Ti supra-subduction zone ophiolites. Low-Ti ophiolitic spinels are generally poorer in iron and richer in Cr, and hence are similar in composition and perhaps tectonic setting to fore-arc boninitic spinels.

Keywords

spinelultramaficmaficplutonKamchatkageochemistry

Information

Type
Geochemistry and Petrology
Information
Mineralogical Magazine , Volume 57 , Issue 389 , December 1993 , pp. 575 - 589
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1993

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Footnotes

*

Now at: Department of Geology, University of South Florida, Tampa, Florida 33620, U.S.A.

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