Pyroxenite veins in spinel peridotites of the Unnavayam sheet, Kuyul ophiolite terrane (Koryak Upland): Origin and setting of formation

G. V. Ledneva, B. A. Bazylev, D. V. Kuzmin, N. N. Kononkova

Research output: Contribution to journalArticlepeer-review

Abstract

Pyroxenite veins in mantle peridotites of the Unnavayam sheet of the Kuyul ophiolite terrane (Koryak—Kamchatka folded area) are composed of clinopyroxenite and websterite crystallized from a boninite-like melt. The host clinopyroxene-bearing spinel harzburgites are moderately depleted residues, whose mineral compositions and conditions of formation correspond to those of peridotites from mid-oceanic and back-arc spreading centers. Mantle peridotites of the Unnavayam sheet may have formed a part of the mantle wedge above a subduction zone and have been intruded by boninitic melts at a certain stage of their evolution.

Original languageEnglish
Pages (from-to)330-340
Number of pages11
JournalGeochemistry International
Volume55
Issue number4
DOIs
Publication statusPublished - 1 Apr 2017

Keywords

  • boninites
  • Koryak–Kamchatka folded area
  • Kuyul terrane
  • ophiolites
  • pyroxenites
  • spinel harzburgites

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