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


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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.

About the authors

G. V. Ledneva

Geological Institute

Author for correspondence.
Email: ledneva@ilran.ru
Russian Federation, Pyzhevskii per. 7, Moscow, 119017

B. A. Bazylev

Vernadsky Institute of Geochemistry and Analytical Chemistry

Email: ledneva@ilran.ru
Russian Federation, ul. Kosygina 19, Moscow, 119991

D. V. Kuzmin

Sobolev Institute of Geology and Mineralogy, Siberian Branch; Novosibirsk State University

Email: ledneva@ilran.ru
Russian Federation, pr. Akademika Koptyuga 3, Novosibirsk, 630090; ul.Pirogova 2, Novosibirsk, 630090

N. N. Kononkova

Vernadsky Institute of Geochemistry and Analytical Chemistry

Email: ledneva@ilran.ru
Russian Federation, ul. Kosygina 19, Moscow, 119991

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