A Pleistocene sandur in western Norway: facies relationships and sedimentological characteristics |
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| Authors: | JON Y LANDVIK JAN MANGERUD |
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| Institution: | University of Bergen, Department of Geology. Section B, Allegt. 41, N-5000 Bergen, Norway |
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| Abstract: | At Godøya near Ålesund sequences of unconsolidated fine sand and silt below two till beds are interpreted as remains of a sandur. Two facies sequences dominate: One comprises erosional scours followed by horizontally and current-ripple laminated fine sand, massive silt and erosional scours. The other sequence differs by planar wedge-shaped cross-beds replacing the horizontal lamination. The planar cross-beds are assumed to represent migrating linguoid or transverse bars, with an orientation partly at a high angle to current ripples in the same beds. The frequent silt beds are interpreted as a result of rapid vertical accretion due to isostatic subsidence during deposition. A Middle Weichselian age is assumed from thermoluminescence, radiocarbon and amino acid dates. |
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