Working Paper Article Version 1 This version is not peer-reviewed

U-Pb Age and Hf Isotope Systematics of Zircon from Eclogite Xenoliths in Devonian Kimberlites: The Neoarchaean Roots of the Central Belarus Suture Zone

Version 1 : Received: 4 October 2021 / Approved: 5 October 2021 / Online: 5 October 2021 (15:43:55 CEST)

How to cite: Shumlyanskyy, L.; Tsymbal, S.; Kusiak, M.A.; Wilde, S.A.; Nemchin, A.A.; Tarasko, I.; Shumlianska, L.; Hofmann, M. U-Pb Age and Hf Isotope Systematics of Zircon from Eclogite Xenoliths in Devonian Kimberlites: The Neoarchaean Roots of the Central Belarus Suture Zone. Preprints 2021, 2021100091 Shumlyanskyy, L.; Tsymbal, S.; Kusiak, M.A.; Wilde, S.A.; Nemchin, A.A.; Tarasko, I.; Shumlianska, L.; Hofmann, M. U-Pb Age and Hf Isotope Systematics of Zircon from Eclogite Xenoliths in Devonian Kimberlites: The Neoarchaean Roots of the Central Belarus Suture Zone. Preprints 2021, 2021100091

Abstract

The results of an LA-ICP-MS U-Pb dating and Hf isotope study of zircon crystals separated from small eclogite xenoliths found in Devonian kimberlites within the Prypyat horst, Ukraine, are reported. The studied area is located in the Central Belarusian Suture Zone, which represents a Paleoproterozoic belt extending along the boundary between the Sarmatian and Fennoscandian segments of the East European Platform. Four laser ablation sites on two zircon grains yielded Paleoproterozoic U-Pb ages between 1954 ± 24 Ma and 1735 ± 54 Ma. In contrast, three of four Hf sites revealed negative εHf values and Paleoarchean to Mesoarchean model ages, excluding the possibility that the eclogite xenoliths represent segments of a Paleoproterozoic subducted slab or younger mafic melts crystallized in the subcontinental lithospheric mantle. A single laser ablation Hf spot yielded a positive εHf value (+3) and a Paleoproterozoic model age. Two models for eclogite origin can be proposed. The first foresees the extension of the Archean lower-crustal or lithospheric roots beneath the Central Belarus Suture Zone for over 200 km from the nearest known outcrop of Archean rocks. The second model is that the Central Belarus Suture Zone represents a rifted-out fragment of the Kola-Karelian craton that was accreted to Sarmatia before the actual collision of these two segments of Baltica.

Keywords

Eclogite xenolith; kimberlite; zircon; U-Pb age; Hf isotopes; Ukrainian Shield; Devonian; East European Platform.

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