Title

I. N. Kapitonov, O. V. Petrov, S. S. Shevchenko, N. A. Goltsin, B. V. Belyatsky, E. M. Pra-solov, K. I. Lokhov, N. V. Rodionov, S. L. Presnyakov, E. N. Lepekhina, N. G. Berezhnaya, Yu. S. Balashova, A. V. Antonov, S. A. Sergeev

Isotope-geochemical and geochronological study of zircons from pelagic ooze from the area of Lomonosov and Alpha-Mendeleev Arctic ridges

The article presents the first U-Pb and Lu-Hf zircon isotope data from a series of pelagic sediments core samples from the Lomonosov and Alpha-Mendeleev ridges area of Arctic Ocean.
According to the dating over 1100 grains it was revealed the presence of a significant number of different age zircon groups. The results indicate the presence of common (with a uniform set of age groups) sources of detrital zircons from pelagic deposits for the entire studied area. Considerable variation in the proportion of different age groups within short time-intervals indicates the variability of the intensity of the main components of the contribution of this zircon source. Comparison with published data shows a similar character of the main detrital zircon age group distribution and its Lu-Hf isotope system signatures with those typical for detrital zircons from the Asian continent. Obtained data set suggests that the significant contribution of other Arctic regions rock basement (North American and European) in the formation of zircon characteristics of the studied samples of pelagic mud seems to be negligible.
Key words: Arctic, zircon, U-Pb dating, hafnium isotope, Lomonosov, Alpha-Mendeleev Ridges.