MORPHOLOGY AND  FORMATION  HISTORY  OF THE ALTAI PENEPLAIN (THE  KURAI  RIDGE AS AN  EXAMPLE)

I. S. Novikov

doi:10.15356/0435-4281-2015-3-70-80

MORPHOLOGY AND FORMATION HISTORY OF THE ALTAI PENEPLAIN (THE KURAI RIDGE AS AN EXAMPLE)

I. S. Novikov

https://doi.org/10.15356/0435-4281-2015-3-70-80

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Abstract

In the result of geomorphological survey in the scale of 1: 50 000 performed in the central part of the Altai Mountains it was found that fragments of the Cretaceous-Paleogene peneplain preserved in the form of vast watershed areas in all the mountain ranges of the region, are actually a ladder of planation surfaces of different age raised at different heights during the neotectonic reactivation.

A comparison of the explored area of the Kurai ridge with the tectonically stable Anabar-Udjinskoye interﬂuve (North of the Siberian platform), has shown the identity of geomorphological structure of the watershed areas and allowed us to extrapolate the datings obtained for the reference Siberian site on different fragments of the planation surfaces in the Altai. On this basios we conclude that on the watershed of the Kurai ridge within one neotectonic block greatest height occupy fragments of the most ancient Middle Cretaceous peneplain, the Late Cretaceous level is lower by 30–40 m, Paleogene – by 50–70 m, and Early Neogene – by 170–200 m. the Good state of preservation of the denudation levels ladder indicates the insigniﬁcance of watersheds denudation during Cenozoic. It also contradicts the model of slow dome-like deformation of the Altai in the Cenozoic with the formation of pediments in the periods of movements slowdown.

Keywords

neotectonics, Altai Mountains, surface of planation

About the Author

I. S. Novikov

Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk
Russian Federation

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Review

For citations:

Novikov I.S. MORPHOLOGY AND FORMATION HISTORY OF THE ALTAI PENEPLAIN (THE KURAI RIDGE AS AN EXAMPLE). Geomorfologiya. 2015;(3):70-80. (In Russ.) https://doi.org/10.15356/0435-4281-2015-3-70-80