Академическое издательство «Гео»

Keywords: Pleistocene glaciations, exaration, glacial paleogeography, morphology, limnology, snow line depression.



GEOGRAPHY AND NATURAL RESOURCES, 2017, № 2, p. 124-134

Cirque lakes of Eastern Transbaikalia

F.I. Enikeev

Institute of Natural Resources, Ecology and Cryology, SB RAS,
ul. Nedorezova, 16a, Chita, 672014, Russia, enikeev_geolog@mail.ru

This paper is concerned with the cirque lakes of the eastern termination of the Stanovoe upland, including the Longdorskii massif, from the right bank of the Vitim river to the eastern boundary of sheets O-50 and N-50 (along the meridian of 120° E) as well as the high-mountain node of the Hentei-Daurian upland on the Onon-Chikoi interfluve in the southwestern part of Zabaikalskii krai. An analysis is made of the occurrence frequency of cirque lakes and their location in altitude, azimuthal sectors and slope aspects. An assessment is made of the dependence of the altitude of the lakes on morphostructural and morphosculptural characteristics of different mountain systems and on the position of the ancient snow line. The formation time of cirque lakes is substantiated. A dependence of the concentration of cirque lakes on the altitude and aspect of the cirques is revealed. It is established that the high concentration of the lakes in the intensely dissected mountains is associated with the cirques of the northeastern orientation. The massive mountain ridges with former reticular glaciation are characterized by an even distribution of the cirque lakes in all azimuthal sectors. The altitudes with the maximum concentration of the lakes coincide with the snow line of the last glaciation. The lakes with minimum altitudes reflect global, regional and local changes in the curvature of the lower boundary of the chionosphere. It is found that the cirque lakes are all located within the boundaries of the last glaciation and have their origins in the early Holocene.

Keywords: Pleistocene glaciations, exaration, glacial paleogeography, morphology, limnology, snow line depression.

DOI: 10.21782/GiPR0206-1619-2017-2(124-134)

главная

www.izdatgeo.ru