Results of a study of U-Pb and Hf isotope systematics and trace element concentrations in five zircon crystals separated from the Devonian Petrivske kimberlite are reported in the paper. Four zircons have yielded Paleoproterozoic and Archean ages, while one zircon grain gave a Devonian age of 383.6 +/- 4.4 Ma (weighted mean Pb-206/U-238 age). The Precambrian zircons have been derived from terrigenous rocks of the Mykolaivka Suite that is cut by kimberlite, or directly from the Precambrian rock complexes that constitute continental crust in the East Azov. The Devonian zircon crystal has the U-Pb age that corresponds to the age of kimber-lite emplacement. It is 14 m.y. younger than zircon megacrysts found in the Novolaspa kimberlite pipe in the same area. In addition, Petrivske zircon is richer in trace elements than its counterparts from the Novolaspa pipe. Petrivske and Novolaspa zircons crystallized from two different proto-kimberlite melts, whereas the process of kimberlite formation was very complex and possibly included several episodes of formation ofpmto-kimberlite melts, separated by extended (over 10 M.y.) periods of time.

Item Type:	Refereed Article
Keywords:	kimberlite, zircon, Ukrainian Shield, U-Pb age, Hf isotopes, trace elements
Research Division:	Earth Sciences
Research Group:	Geology
Research Field:	Planetary geology
Objective Division:	Expanding Knowledge
Objective Group:	Expanding knowledge
Objective Field:	Expanding knowledge in the earth sciences
UTAS Author:	Kamenetsky, V (Professor Vadim Kamenetsky)
ID Code:	151947
Year Published:	2018
Deposited By:	CODES ARC
Deposited On:	2022-08-09
Last Modified:	2022-09-16
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