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RELIEF AND DEPOSITS OF THE LATE CENOZOIC PERIOD OF THE NORTHWESTERN PART OF THE CENTRAL YAKUT PLAIN AND ADJACENT TERRITORY OF THE EAST SIBERIAN PLATEAU (SHEET Q-51)

M. V. Mikharevich 1,2, I. S. Novikov 3, O. B. Kuzmina 4

1 Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia; 2 P.I.Melnikov Permafrost Institute SB RAS, Yakutsk, Russia; 3 V.S.Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, Russia; 4 A.A.Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russia

The so-called “watershed coarse gravels” of the Neogene were preserved within the development of heterochronous denudation peneplanation planes. Based on the comparison of paleontological data with the global eustatic Hague-Weil curve, a ladder of denudation levels is constructed. According to the latter, the age of alluvial are determined. Correlation of the deposits of erosion-accumulative terraces in the conditions of the Munsky neotectonic uplift with alluvium in the valley of the Lena is realised. For the latter, the Late Neo-Pleistocene-Holocene age is substantiated and separate geomorphological unit is proposed. The conclusion is made about the weak notion substantiation on the dammed origin of the Mavrinskaya Formation and its age range, the significant role of subaeral processes in its formation in the interval of the Samarovo-Muruktinskoye time is assumed.

Keywords: Event chronology, history of relief development, “watershed coarse gravels”, Oruchanskaya Formation, Bestyakhskaya Formation, Mavrinskaya Formation, subaerial polygenetic complex.

DOI 10.20403/2078-0575-2021-10c-47-56

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