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Raised beach forms and evidence of submarine permafrost on the Varanger Peninsula, North Norway

Sanjaume, E. ; Tolgensbakk, J.

Journal of coastal research, 2005, Vol.SI (49), p.3-8 [Periódico revisado por pares]

Fort Lauderdale: Coastal Education & Research Foundation (CERF)

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  • Título:
    Raised beach forms and evidence of submarine permafrost on the Varanger Peninsula, North Norway
  • Autor: Sanjaume, E. ; Tolgensbakk, J.
  • Assuntos: Beaches ; Coastal ; Drainage ; Glacial landforms ; Glaciers ; Ice ; Marine geology ; Melting ; Meters ; Peninsulas ; Permafrost ; Ridges ; River deltas ; Sediments ; Valleys ; Younger Dryas period
  • É parte de: Journal of coastal research, 2005, Vol.SI (49), p.3-8
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Some raised beaches at Komagvær and Sandfjorden (Varanger Peninsula, Northern Norway) show striking erosional features. On a raised delta at Komagvær several beach ridges are crossing depressions and in spite of a subsidence of 8 meters the ridges still keep their original shape, direction, structure, and fabric. The sinking must be due to thermokarst. After the beach ridges were formed and the relative sea level was lowered, because of isostatic uplift, part of the area has sunk due to a presumed slow melting of buried glacier ice that has been preserved in a submarine permafrost environment. At Sandfjorden high ridges of sedimentary deposits close two tributary valleys. The surface of the ridges is covered by beach ridge material. The material is very coarse and accordingly permeable. The present drainage percolates through these damming ridges. The sequence of beach ridges above the Younger Dryas ridge (Main Line) has been eroded by rivers from the dammed lakes, while younger beach ridges are not eroded. This could only be possible if the sedimentary ridges were frozen from the time of deglaciation until the end of Younger Dryas.
  • Editor: Fort Lauderdale: Coastal Education & Research Foundation (CERF)
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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