Abstract
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)
Highlights
The Bug granulite complex (BGC) is located in the southwestern Dniester-Bug Province of the Ukrainian shield (Figure 1A) and consists of felsic orthogneiss with minor mafic-ultramafic enclaves
All zircon grains show signs of alteration which increases from zircon I to zircon III
This alteration was accompanied by a local redistribution of Zr and Hf and indicates a significant fluid reworking that led to redistribution of these elements in zircons II and III
Summary
The BGC is located in the southwestern Dniester-Bug Province of the Ukrainian shield (Figure 1A) and consists of felsic orthogneiss with minor mafic-ultramafic enclaves. The BGC units show imprints of several geological events: 3.7-3.66, 2.8, 2.3 and 2.0Ga [1,2,3]. Age of 3.3Ga has been recently obtained for magmatic zircon from the orthopyroxenite enclave (zircon, U-Pb SHRIMP, [3]). The broad peak around 2.8Ga on the histogram of U-Pb zircon ages reflects the age of high-temperature metamorphic event [1,2]. Simultaneous igneous mafic-ultramafic rocks were not found within studied area. The purpose of our study is to fill this gap of magmatic activity
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