METASOMATIC ORIGIN OF LAMELLAR-LIKE INCLUSIONS IN CLINOPYROXENES FROM MANTLE XENOLITHS OF THE OBNAZHENNAYA PIPE (KUOIKA FIELD, YAKUTIAN DIAMONDIFEROUS PROVINCE)

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Abstract

The article reports new data on previously undescribed lamellar-like (linearly oriented) structures in clinopyroxenes from mantle xenoliths of garnet pyroxenites (Obnazhennaya pipe, Northern Siberia). The origin and mineral diversity of lamellar structures in xenoliths from the Obnazhennaya pipe are supposed to be related to a breakdown of solid solutions during a decrease of P–T parameters. Our study shows that metasomatic recrystallization of initial clinopyroxene with linear exsolution structures leads to the formation of new secondary mineral assemblages. The secondary clinopyroxene reproduces (inherits) framework with linearly oriented inclusions, which are morphologically similar to the primary exsolution structures. Thus, the pyroxenite xenoliths from the Obnazhennaya pipe contain two generations of mineral associations with lamellar structures: primary and secondary. The primary association is composed of diopside, containing lamellae of enstatite, pyrope, spinel and rutile. The secondary (metasomatic) clinopyroxene contains half as much Al2O3 (3.4 wt %) and Na2O (1.7 wt %) and is enriched in MgO and CaO compared to the primary clinopyroxene. Nevertheless, the chemical composition of the secondary pyroxene still corresponds to diopside end-member. The metasomatic association comprises aligned pargasite (Al-rich amphibole) instead of orthopyroxene (enstatite) lamellae, and the secondary rutile is enriched in chromium (up to 3.1 wt % Cr2O3) in contrast to rutile from the primary mineral assemblage.

About the authors

N. M. Korolev

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Author for correspondence.
Email: korolev.nm@gmail.com
Russian, St.-Petersburg

L. P. Nikitina

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Email: korolev.nm@gmail.com
Russian, St.-Petersburg

A. B. Kuznetsov

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences; Saint Petersburg State University

Email: korolev.nm@gmail.com
Russian, St.-Petersburg; Russian, St.-Petersburg

A. G. Goncharov

Saint Petersburg State University

Email: korolev.nm@gmail.com
Russian, St.-Petersburg

O. L. Galankina

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Email: korolev.nm@gmail.com
Russian, St.-Petersburg

V. V. Shilovskikh

Saint Petersburg State University

Email: korolev.nm@gmail.com
Russian, St.-Petersburg

N. S. Vlasenko

Saint Petersburg State University

Email: korolev.nm@gmail.com
Russian, St.-Petersburg

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Copyright (c) 2023 Н.М. Королев, Л.П. Никитина, А.Б. Кузнецов, А.Г. Гончаров, О.Л. Галанкина, В.В. Шиловских, Н.С. Власенко

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