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Zircon from diamondiferous kyanite gneisses of the Kokchetav massif: Revealing growth stages using an integrated cathodoluminescence, Raman spectroscopy and electron microprobe approach

Published online by Cambridge University Press:  25 November 2020

Olga V. Rezvukhina Open the ORCID record for Olga V. Rezvukhina [Opens in a new window] ,
Andrey V. Korsakov Open the ORCID record for Andrey V. Korsakov [Opens in a new window] ,
Dmitriy I. Rezvukhin Open the ORCID record for Dmitriy I. Rezvukhin [Opens in a new window] ,
Denis S. Mikhailenko Open the ORCID record for Denis S. Mikhailenko [Opens in a new window] ,
Dmitry A. Zamyatin Open the ORCID record for Dmitry A. Zamyatin [Opens in a new window] ,
Evgeny D. Greshnyakov Open the ORCID record for Evgeny D. Greshnyakov [Opens in a new window]  and
Vladimir Ya. Shur Open the ORCID record for Vladimir Ya. Shur [Opens in a new window]
Olga V. Rezvukhina*
Affiliation:
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 3 Koptyuga ave., Novosibirsk, 630090, Russia
Andrey V. Korsakov
Affiliation:
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 3 Koptyuga ave., Novosibirsk, 630090, Russia
Dmitriy I. Rezvukhin
Affiliation:
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 3 Koptyuga ave., Novosibirsk, 630090, Russia
Denis S. Mikhailenko
Affiliation:
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, 3 Koptyuga ave., Novosibirsk, 630090, Russia Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 511 Kehua st., Tianhe, Guangzhou, 510640, China
Dmitry A. Zamyatin
Affiliation:
Zavaritsky Institute of Geology and Geochemistry UB RAS, 15 Vonsovskogo st., Ekaterinburg, 620016, Russia Institute of Physics and Technology, Ural Federal University, 21 Mira st., Ekaterinburg, 620002, Russia
Evgeny D. Greshnyakov
Affiliation:
School of Natural Sciences and Mathematics, Ural Federal University, 51 Lenin Ave., Ekaterinburg, 620000, Russia
Vladimir Ya. Shur
Affiliation:
School of Natural Sciences and Mathematics, Ural Federal University, 51 Lenin Ave., Ekaterinburg, 620000, Russia
*
*Author for correspondence: Olga V. Rezvukhina, Email: olgashchepetova@igm.nsc.ru
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Abstract

Zircon crystals from diamondiferous kyanite gneisses of the Barchi-Kol area (Kokchetav massif, Northern Kazakhstan) have been investigated by a combined application of cathodoluminescence (CL), Raman spectroscopy and electron probe microanalysis (EPMA). The zircon crystals exhibit up to four distinct domains characterised by significantly different CL signatures and parameters of the ν3(SiO4) (1008 cm–1) Raman band (i.e. full width at half maximum, position and intensity). Extremely metamict zircon cores (Domain I) host inclusions of low-pressure minerals (quartz and graphite) and the outer mantles (Domain III) are populated by ultrahigh-pressure relicts (diamond and coesite), whereas inner mantles (Domain II) and overgrowth rim zones (Domain IV) are inclusion free. Both the zircon cores and rims have very low Ti concentrations, implying formation temperatures below 760°C. The Ti content in the inner mantles (up to 40 ppm) is indicative of temperatures in the 760–880°C range. The temperature estimates for the outer mantles are 900–940°C, indicating a pronounced overlap with the peak metamorphic values yielded by the Zr-in-rutile geothermometer for the same rocks (910–950°C). The internal textures of the zircons and the occurrence of index minerals within the distinct domains allow us to unravel the stages of the complex metamorphic history recorded in the zircon. Our data show that the zircon cores are inherited seeds of pre-metamorphic (magmatic?) origin, the inner mantles were formed on the prograde metamorphic stage, the outer mantles record ultrahigh-pressure metamorphism and the outermost rims mark the retrograde metamorphic stage. The observed zircon internal textures are thus clearly correlated with distinct growth events, and in some examples reflect a major part of the metamorphic history. It is concluded that the combined application of the CL, Raman spectroscopy and EPMA techniques to zircon offers significant potential for deciphering the metamorphic evolution of deeply-subducted rocks.

Keywords

zirconcathodoluminescenceRaman spectroscopyelectron microprobeultrahigh-pressure metamorphismKokchetav massif
Type
Article
Information
Mineralogical Magazine , Volume 84 , Issue 6 , December 2020 , pp. 949 - 958
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: Craig Storey

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