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Abstract
Archaeology & Anthropology: Open Access
Origin of Zircon from a Lherzolite Lens Based on its U-Pb SHRIMP Age, Lu-Hf Isotopic System and Trace Elements: An Input to Revealing of 2.8Ga Magmatism in the Paleoarchean Bug Granulite Complex (The Ukrainian Shield)
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Open or Close Lobach-Zhuchenko SB1s, Sergeev SA2,3, Baltybaev Sh.K1*, Lokhov KI2,3, Egorova Ju.S1, Galankina OL1, Balagansky VV4,
Skublov SG1,5, Bogomolov ES1,3 and Berezhnaya NG3
1 Institute of Precambrian Geology and Geochronology, Russia
2 Saint Petersburg State University, Russia
3 Karpinsky Russian Geological Research Institute, Russia
4 Geological Institute of the Kola Science Centre, Russia
5 Saint-Petersburg Mining University, Russia
*Corresponding author: Baltybaev K, Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, Saint Petersburg, Russia
Submission: July 02, 2018; Published: September 20, 2018
ISSN: 2577-1949Volume3 Issue1
Abstract
The Bug granulite complex (BGC) comprises mainly Paleoarchean orthogneisses and represents the oldest portion of the Ukrainian shield. It has a very long (3.8-2.0Ga) and a complex evolutionary history and contains numerous mafic and ultramafic enclaves of different age and origin. This study is focused on a zoned peridotite lens within the orthogneisses. Zircon separated from a marginal web sterite part of the lens yielded a U-Pb (SIMS SHRIMP II) age of 2814±51Ma. In-situ U-Pb and Lu-Hf isotopic analyses combined with BSE and CL imaging and trace element data provided evidence of magmatic origin of zircon. The εHf (2.8Ga) of zircon varies from -8.5 to -10.7 and indicates that the ultramafic melt contained an old component probably assimilated from the host orthogneiss. Field observations and obtained analytical data suggest that the lens is a fragment of a lherzolite dyke, and the age 2.81Ga is interpreted as the age of its crystallization.
Keywords: Zircon; SHRIMP II; Archean; Peridotite; Ukrainian shield
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