Metasomatic Evolution of Coesite-Bearing Diamondiferous Eclogite from the Udachnaya Kimberlite
A coesite-bearing diamondiferous eclogite from the Udachnaya kimberlite (Daldyn field, Siberian craton) has been studied to trace its complex evolution recorded in rock-forming and minor mineral constituents. The eclogite sample is composed of rock-forming omphacite (60 vol%), garnet (35 vol%) and q...
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MDPI AG
2020-04-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/10/4/383 |
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| author | Denis Mikhailenko Alexander Golovin Andrey Korsakov Sonja Aulbach Axel Gerdes Alexey Ragozin |
| author_facet | Denis Mikhailenko Alexander Golovin Andrey Korsakov Sonja Aulbach Axel Gerdes Alexey Ragozin |
| author_sort | Denis Mikhailenko |
| collection | DOAJ |
| description | A coesite-bearing diamondiferous eclogite from the Udachnaya kimberlite (Daldyn field, Siberian craton) has been studied to trace its complex evolution recorded in rock-forming and minor mineral constituents. The eclogite sample is composed of rock-forming omphacite (60 vol%), garnet (35 vol%) and quartz/coesite (5 vol%) and contains intergranular euhedral zoned olivine crystals, up to 200 µm long, coexisting with phlogopite, orthopyroxene, clinopyroxene (secondary), K-feldspar, plagioclase, spinel, sodalite and djerfisherite. Garnet grains are zoned, with a relatively homogeneous core and a more magnesian overgrowth rim. The rim zones further differ from the core in having higher Zr/Y (6 times that in the cores), ascribed to interaction with, or precipitation from, a kimberlite-related melt. Judging by pressure-temperature estimates (~1200 °C; 6.2 GPa), the xenolith originated at depths of ~180–200 km at the base of the continental lithosphere. The spatial coexistence of olivine, orthopyroxene and coesite/quartz with K-Na-Cl minerals in the xenolith indicates that eclogite reacted with a deep-seated kimberlite melt. However, Fe-rich olivine, orthopyroxene and low-pressure minerals (sodalite and djerfisherite) likely result from metasomatic reaction at shallower depths during transport of the eclogite by the erupting kimberlite melt. Our results demonstrate that a mixed eclogitic-peridotitic paragenesis, reported previously from inclusions in diamond, can form by interaction of eclogite and a kimberlite-related melt. |
| first_indexed | 2024-03-10T20:15:59Z |
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| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T20:15:59Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-f98b6002658a47ffabb1b88778d235672023-11-19T22:35:01ZengMDPI AGMinerals2075-163X2020-04-0110438310.3390/min10040383Metasomatic Evolution of Coesite-Bearing Diamondiferous Eclogite from the Udachnaya KimberliteDenis Mikhailenko0Alexander Golovin1Andrey Korsakov2Sonja Aulbach3Axel Gerdes4Alexey Ragozin5Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, RussiaSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, RussiaSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, RussiaInstitut für Geowissenschaften, Goethe-Universität, Frankfurt am Main, 60323 Frankfurt, GermanyInstitut für Geowissenschaften, Goethe-Universität, Frankfurt am Main, 60323 Frankfurt, GermanySobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, RussiaA coesite-bearing diamondiferous eclogite from the Udachnaya kimberlite (Daldyn field, Siberian craton) has been studied to trace its complex evolution recorded in rock-forming and minor mineral constituents. The eclogite sample is composed of rock-forming omphacite (60 vol%), garnet (35 vol%) and quartz/coesite (5 vol%) and contains intergranular euhedral zoned olivine crystals, up to 200 µm long, coexisting with phlogopite, orthopyroxene, clinopyroxene (secondary), K-feldspar, plagioclase, spinel, sodalite and djerfisherite. Garnet grains are zoned, with a relatively homogeneous core and a more magnesian overgrowth rim. The rim zones further differ from the core in having higher Zr/Y (6 times that in the cores), ascribed to interaction with, or precipitation from, a kimberlite-related melt. Judging by pressure-temperature estimates (~1200 °C; 6.2 GPa), the xenolith originated at depths of ~180–200 km at the base of the continental lithosphere. The spatial coexistence of olivine, orthopyroxene and coesite/quartz with K-Na-Cl minerals in the xenolith indicates that eclogite reacted with a deep-seated kimberlite melt. However, Fe-rich olivine, orthopyroxene and low-pressure minerals (sodalite and djerfisherite) likely result from metasomatic reaction at shallower depths during transport of the eclogite by the erupting kimberlite melt. Our results demonstrate that a mixed eclogitic-peridotitic paragenesis, reported previously from inclusions in diamond, can form by interaction of eclogite and a kimberlite-related melt.https://www.mdpi.com/2075-163X/10/4/383eclogitelithospheric mantlekimberliteUdachnaya pipemeltingmetasomatism |
| spellingShingle | Denis Mikhailenko Alexander Golovin Andrey Korsakov Sonja Aulbach Axel Gerdes Alexey Ragozin Metasomatic Evolution of Coesite-Bearing Diamondiferous Eclogite from the Udachnaya Kimberlite Minerals eclogite lithospheric mantle kimberlite Udachnaya pipe melting metasomatism |
| title | Metasomatic Evolution of Coesite-Bearing Diamondiferous Eclogite from the Udachnaya Kimberlite |
| title_full | Metasomatic Evolution of Coesite-Bearing Diamondiferous Eclogite from the Udachnaya Kimberlite |
| title_fullStr | Metasomatic Evolution of Coesite-Bearing Diamondiferous Eclogite from the Udachnaya Kimberlite |
| title_full_unstemmed | Metasomatic Evolution of Coesite-Bearing Diamondiferous Eclogite from the Udachnaya Kimberlite |
| title_short | Metasomatic Evolution of Coesite-Bearing Diamondiferous Eclogite from the Udachnaya Kimberlite |
| title_sort | metasomatic evolution of coesite bearing diamondiferous eclogite from the udachnaya kimberlite |
| topic | eclogite lithospheric mantle kimberlite Udachnaya pipe melting metasomatism |
| url | https://www.mdpi.com/2075-163X/10/4/383 |
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