skip to main content
Idioma:
Primo Search
Clear Search Box
Search in: Busca Geral
Busca Avançada
Busca por Índices
Tipo de recurso Mostra resultados com: Mostra resultados com: Índice

Lake systems in mountain borders of the Great Lakes Basin of Mongolia: From Pleistocene catastrophes to Holocene gradual evolution (case study from southwestern Tuva)

Agatova, A.R. ; Nepop, R.K. ; Glebova, A.N.

Quaternary international, 2020-02, Vol.538, p.53-62 [Periódico revisado por pares]

Elsevier Ltd

Texto completo disponível

Citações Citado por
  • Título:
    Lake systems in mountain borders of the Great Lakes Basin of Mongolia: From Pleistocene catastrophes to Holocene gradual evolution (case study from southwestern Tuva)
  • Autor: Agatova, A.R. ; Nepop, R.K. ; Glebova, A.N.
  • Assuntos: Ak-Hol basin ; Dammed lakes ; Landscape evolution ; Late Pleistocene-Holocene ; Outburst floods ; SW Tuva
  • É parte de: Quaternary international, 2020-02, Vol.538, p.53-62
  • Descrição: The paper presents results of integrated geological, geomorphological, geochronological, and geoarchaeological studies in the basin of Lake Ak-Hol located in southwestern Tuva (Russia), in mountains north of the Great Lakes Basin of Mongolia. The Pleistocene-Holocene history of the basin consisted of several stages recorded in terrain and deposition patterns. The highest stand of Lake Ak-Hol (180 m above the present level and 16 times greater area) was due to an ice dam and was coeval to the appearance of organic matter (remnants of higher aquatic plants and algae) in lake sediments about 14 ka cal BP. At the next stage, the lake was impounded by a moraine dam. 14C ages of buried soils indicate that the level of the ice- and moraine-dammed lake fell to below 222 m asl long before 8.5 ka cal BP. Erosion of the moraine dam may correspond to the event of lake drying about 12 ka cal BP evident from a deposition gap in sedimentary cores. That event of sudden drainage may have been the last catastrophic flood into the Great Lakes Basin traceable in the catchment of the Mogen-Buren River. Judging from the obtained 14C ages of sediments from the Mogen-Buren Valley, ice- and moraine-dammed lakes in the Ak-Hol system underwent cataclysmic outburst floods only before 11.6 ka cal BP. In the Holocene, after the moraine dam failure, the lake level changes were controlled solely by climate. The general decreasing trend was repeatedly interrupted by high stand excursions (up to 15 m of relative level rise). Nomad peoples settled on the floor of the highland Ak-Hol basin since the Late Bronze Age. All archaeological sites (from that time to the time of Turkic cultures) mapped in the basin are located above 2220 m asl and lack signatures of water erosion, indicating that the lake never rose above that altitude for the past 3 ka years.
  • Editor: Elsevier Ltd
  • Idioma: Inglês
Voltar para lista de resultados

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.