Development of the western part of the Turan-Uyuk basin (Tuva highland) in the late quaternary

Reconstruction of the Turan-Uyuk basin Late Quaternary history was based on the complex of methods. It includes field survey and geomorphic mapping, mechanical coring, radiocarbon and OSL dating of sediments, electrical prospecting. It was revealed, that total thickness of Turan-Uyuk basin infill is up to 190 m. Key stages of the Turan-Uyuk basin Late Quaternary history were established: 1) alluvial filling of the Uyuk valley and intensive lateral fluvial migration and simultaneous lacustrine filling of Belye lakes basin during the most part of Late Pleistocene (at least, starting from 77–87 ka) and first half of the Holocene (until 6.1 ka), formation of 1st and 2nd generations of floodplain; not later than 25–16 ka Uyuk alluvial fan start to advance into Belye lakes basin, 2) Incision due to increase of river runoff associated with climatic changes (started not earlier than 6.1–6.2 ka, finished before 2.4–2.6 ka) and formation of 3rd generation of floodplain; 3) filling of the Uyuk valley and lateral fluvial migration due to drying up of the climate and lowering of river runoff in last 2.4–2.6 ka and formation of the 4th generation of floodplain. Inside this stage an episode of cryogenic processes increase took place. Permafrost formation started not earlier than 2.8 ka, but maximum of cryogenic activity occurred presumably 1.35–1.1 ka. Late Pleistocene valley filling was preceded by deep incision, caused, presumably, by tectonics. Chronology of incision is uncertain. It started not earlier than 360-380 ka and finished long before 77–87 ka. Collected data unequivocally approve an absence of the vast dam lakes, occupying most part of the Turan-Uyuk basin, at least during the Late Quaternary.

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