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Mineralogy and Petrology

, Volume 112, Supplement 1, pp 85–100 | Cite as

Origin of zircon-bearing mantle eclogites entrained in the V. Grib kimberlite (Arkhangelsk region, NW Russia): Evidence from mineral geochemistry and the U-Pb and Lu-Hf isotope compositions of zircon

  • Elena V. ShchukinaEmail author
  • Alexey M. Agashev
  • Dmitry A. Zedgenizov
Original Paper
  • 128 Downloads

Abstract

The concentrations of major and trace elements in minerals, reconstructed whole-rock compositions of zircon-bearing equigranular eclogites from the V. Grib kimberlite pipe located within the Arkhangelsk Diamondiferous Province (North-Western Russia), and results of the U-Pb and Lu-Hf isotope analyses of zircon grains from eclogites and granulite xenoliths are reported. These data suggest that the equigranular eclogites could represent the fragments of mid-ocean-ridge basalt that were metamorphosed during Paleoproterozoic subduction at 1.7–1.9 Ga. The Hf isotope compositions of the eclogitic zircon display uniformity and indicate corresponding Hf-depleted mantle model ages of 2.2–2.3 Ga. The formation of zircon in eclogites could have resulted from interactions with metasomatic/subduction-related fluids just prior to, but associated with, Paleoproterozoic eclogite formation. A link between eclogitic zircon formation and continental lower-crustal rocks can be excluded based on differences in the Hf isotope compositions of eclogitic and granulitic zircon grains. The U-Pb upper intercept age of granulitic zircon of 2716 ± 61 Ma provides a new minimum age constraint for zircon crystallisation and granulite formation. The U-Pb ages obtained from granulitic zircon show two stages of Pb loss at 2.2–2.6 Ga and 1.7–2.0 Ga. The late Paleoproterozoic stage of Pb loss recorded in granulitic zircon is due to the intensive reworking of basement crustal rocks, which was caused by a tectonic process/subduction event associated with equigranular eclogite formation. Our data, along with evidence previously obtained from the V. Grib pipe coarse-granular eclogites, show at least two main subduction events in the lithospheric mantle of the Arkhangelsk region: the Archean (2.8 Ga) and Paleoproterozoic (1.7–1.9 Ga) subductions, which correspond to major magmatic and metamorphic events in the Baltic Shield.

Keywords

Zircon-bearing eclogites Archean and Paleoproterozoic subduction Hf isotopes Kimberlite 

Notes

Acknowledgements

The authors thank Vladimir N. Korolyuk, Larisa V. Usova, and Stanislav V. Palessky (Analytical Centre for multi-element and isotope research Institute Geology and Mineralogy Siberian Branch Russian Academy of Science) for their kind assistance in EMPA and LA-ICP-MS analyses, Sergey G. Simakin (Yaroslavl Branch of the Physical–Technological Institute of Russian Academy of Science) for zircon SIMS study, Elena A. Belousova (GEMOC Key Centre, Macquarie University, Australia) for zircon LA-ICP-MS U-Pb and Lu-Hf isotope analyses. This manuscript has benefited from the helpful comments of Thomas Stachel, reviewer Qiao Shu, an anonymous reviewer, and editor Jingao Liu. This work was supported by the Russian Science Foundation under grant no. 16-17-10067.

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2018

Authors and Affiliations

  • Elena V. Shchukina
    • 1
    • 2
    Email author
  • Alexey M. Agashev
    • 1
  • Dmitry A. Zedgenizov
    • 1
    • 2
  1. 1.Sobolev Institute of Geology and MineralogySiberian Branch Russian Academy of SciencesNovosibirskRussia
  2. 2.Novosibirsk State UniversityNovosibirskRussia

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