The Age of Clastic Zircon from Metasedimentary Rocks of Eastern-Annovka Zone
UDC 550.93 : 549.514.81 : 552.45 (477)
https://doi.org/10.15407/mineraljournal.37.01.086
G.V. Artemenko (1), L.V. Shumlyanskyy (1), A.Yu. Bekker (2), I.A. Samborskaya (1), K.I. Gogolev (1), A.V. Martynyuk (3)
(1) M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of NAS of Ukraine
34, Acad. Palladina Pr., Kyiv-142, Ukraine, 03680
E-mail: regul@igmof.gov.ua.
(2) University of Manitoba, Canada
515, Portage Av., Winnipeg, Manitoba, МВ Canada R3B 2E9
E-mail: bekker@cc.umanitoba.ca
(3) Kryvyi Rih KGR, KP "Yuzhukrgeologiya"
11, Chernyshevskogo Str., Dnipropetrovsk, Ukraine, 49000
E-mail: pravobereg@rambler.ru
The Age of Clastic Zircon from Metasedimentary Rocks of Eastern-Annovka Zone
Language: Russian
Mineralogical journal 2015, 37 (1): 86-94
Abstract: The question of the age ratio of metasedimentary rocks of Kryvyi Rih series of Kryvyi Rih-Kremenchug structures with metasediments apper Archean greenstone structures similar composition of Middle-Dnieper megablock remains far understudied. In this regard, of particular interest to her associate "zone" East-Annivka, Zhovtorichka, Vysokopillya structures in which there is "the overlap" metasediments and ferruginous quartzite on metabasites Mesoarchean greenstone structures. In metabasite thicknes of East-Annivka bands are present in significant amount of basalt-, peridotite- and pyroxenite komatiites, so many researchers have attributed it to Konka series. Metasedimentary rocks that overlapping metabasites thickness of East-Annivka zone, according to traditional notions relate to Kryvyi Rih series. According to another viewpoint, quartzite-shale thickness of East-Annivka zone compared to the middle iron subsuite — and metabasite thickness — to the bottom subsuite of the Konka series. The U-Pb age of detrital zircon from quartzite of the East-Annivka zone measured with LA-ICP-MS method is 3046 ± 23 Ma. Metasedimentary rocks of the East-Annivka zone are probably younger than rocks of the Konka series, as metasandstones in iron formation of the Konka series of the Chortomlyk deposit contain detrital zircons with minimum age of 3.08 Ga, although this difference in apparent ages might be caused by difference in sediment provenance. Decrial zircons from quartzite of the East-Annivka zone were likely derived by erosion of the early phase of plagiogranitoids of the Sura complex with the age around 3.1—3.05 Ga that intruded the komatiite-basalt sequence of the greenstone belt.
Keywords: quartzite, clastic zircon, U-Pb age, Konka serіes, East-Annivka zone, Middle-Dnieper megablock.
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