Doklady Earth Sciences

, Volume 476, Issue 1, pp 1026–1032 | Cite as

The first discovery of Hadean zircon in garnet granulites from the Sutam River (Aldan Shield)

  • M. Z. Glukhovskii
  • M. I. Kuz’min
  • T. B. Bayanova
  • L. M. Lyalina
  • V. A. Makrygina
  • T. F. Shcherbakova
Geochemistry

Abstract

For the first time in Russia, a Hadean zircon grain with an age of 3.94 Ga (ID-TIMS) has been discovered in high-aluminous garnet granulites of the Aldan Shield among the U–Pb zircons with an age from 1.92 Ga. In this connection, the problems of its parental source, the petrogenesis of granulites that captured this zircon, and the mechanism of occurrence of these deep rocks in the upper horizons of the crust have been solved. The comparison of the geochemistry of garnet granulites and the middle crust has shown that the granulites are enriched in the entire range of rare-earth elements (except for the Eu minimum), as well as in Al2O3, U, and Th and are depleted in the most mobile elements (Na, Ca, Sr). In the upper part of the allitic weathering zone of the middle crust, which formed under conditions of arid climate, this zircon grain was originated from the weathered granites from the middle crust. In the latter case, they were empleced discretely in the upper granite–gneiss crust under high pressure conditions (the rutile age is 1.83–1.82 Ga). The zircon with an age of 3.94 Ga is comparable to the Hadean zircons from orthogneisses of the Acasta region (Canadian Shield, 4.03–3.94 Ga).

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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  • M. Z. Glukhovskii
    • 1
  • M. I. Kuz’min
    • 2
  • T. B. Bayanova
    • 3
  • L. M. Lyalina
    • 3
  • V. A. Makrygina
    • 2
  • T. F. Shcherbakova
    • 1
  1. 1.Geological InstituteRussian Academy of SciencesMoscowRussia
  2. 2.Vinogradov Institute of Geochemistry, Siberian BranchRussian Academy of SciencesIrkutskRussia
  3. 3.Kola Scientific Center, Institute of GeologyRussian Academy of SciencesApatityRussia

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