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

N. M. Korolev; Королев Н. М.; L. P. Nikitina; Никитина Л. П.; A. B. Kuznetsov; Кузнецов А. Б.; A. G. Goncharov; Гончаров А. Г.; O. L. Galankina; Галанкина О. Л.; V. V. Shilovskikh; Шиловских В. В.; N. S. Vlasenko; Власенко Н. С.

doi:10.31857/S2686739723600066

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

Authors: Korolev N.M.¹, Nikitina L.P.¹, Kuznetsov A.B.¹^,2, Goncharov A.G.², Galankina O.L.¹, Shilovskikh V.V.², Vlasenko N.S.²
Affiliations:
1. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences
2. Saint Petersburg State University
Issue: Vol 510, No 2 (2023)
Pages: 174-180
Section: MINERALOGY
Submitted: 30.01.2025
Published: 01.06.2023
URL: https://rjmseer.com/2686-7397/article/view/649648
DOI: https://doi.org/10.31857/S2686739723600066
EDN: https://elibrary.ru/UJKAPW
ID: 649648

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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.

Keywords

Siberian Craton, pyroxenite, lithosphere, mantle, metasomatism

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