Pb–Pb AGE OF CARBONATE ROCKS OF THE KAMO GROUP, BAIKIT ANTECLISE OF SIBERIAN PLATFORM
The first direct Pb–Pb dating of carbonate rocks of the Kamo Group has been carried out. The age of carbonates of the lower units (the Madra, Jurubchen, Kuyumba and Vingold formations) of this sedimentary sequence is 1510 ± 50 Ma, and that of the upper unit (the Iremeken Formation) is 1490 ± 50 Ma. The obtained dates showed that all the carbonate formations of the Kamo Group are Lower Riphean (the early Mesoproterozoic), and their deposition continued for a period no longer than several tens of millions of years. The new geochronological data make it possible to correlate the Riphean succession of the Baikit Anteclise with the rocks of the Riphean cover of the Anabar Uplift.