Crimson Publishers Publish With Us Reprints e-Books Video articles


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)

Submission: July 02, 2018; Published: September 20, 2018

DOI: 10.31031/AAOA.2018.03.000553

ISSN: 2577-1949
Volume3 Issue1


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

Get access to the full text of this article