Pyroxenite veins in spinel peridotites of the Unnavayam sheet,Kuyul ophiolite terrane (Koryak Upland): Origin and setting of formation |
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| Authors: | G. V. Ledneva B. A. Bazylev D. V. Kuzmin N. N. Kononkova |
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| Affiliation: | 1.Geological Institute,Russian Academy of Sciences,Moscow,Russia;2.Vernadsky Institute of Geochemistry and Analytical Chemistry,Russian Academy of Sciences,Moscow,Russia;3.Sobolev Institute of Geology and Mineralogy, Siberian Branch,Russian Academy of Sciences,Novosibirsk,Russia;4.Novosibirsk State University,Novosibirsk,Russia |
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| 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. |
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