| Reference Type | Journal (article/letter/editorial) |
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| Title | Geochemistry of plutonic spinels from the North Kamchatka Arc: comparisons with spinels from other tectonic settings |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Kepezhinskas, Pavel K. | Author |
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| Taylor, Rex N. | Author |
| Tanaka, Hisao | Author |
| Year | 1993 (December) | Volume | 57 |
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| Issue | 389 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_57/57-389-575.pdf+ |
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| DOI | doi:10.1180/minmag.1993.057.389.02Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 1967 | Long-form Identifier | mindat:1:5:1967:9 |
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| GUID | 0 |
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| Full Reference | Kepezhinskas, Pavel K., Taylor, Rex N., Tanaka, Hisao (1993) Geochemistry of plutonic spinels from the North Kamchatka Arc: comparisons with spinels from other tectonic settings. Mineralogical Magazine, 57 (389) 575-589 doi:10.1180/minmag.1993.057.389.02 |
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| Plain Text | Kepezhinskas, Pavel K., Taylor, Rex N., Tanaka, Hisao (1993) Geochemistry of plutonic spinels from the North Kamchatka Arc: comparisons with spinels from other tectonic settings. Mineralogical Magazine, 57 (389) 575-589 doi:10.1180/minmag.1993.057.389.02 |
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| In | (1993, December) Mineralogical Magazine Vol. 57 (389) Mineralogical Society |
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| Abstract/Notes | AbstractUltramafic 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. |
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