Glacial geological implications of preconsolidation values in sub‐till sediments at Skorgenes, western Norway

• Published in: Boreas
• Main Authors: LARSEN, EILIV, SANDVEN, ROLF, HEYERDAHL, HÅKON, HERNES, SIGRUN
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1995
• Subjects: Norway; glacier
• Online Access: http://dx.doi.org/10.1111/j.1502-3885.1995.tb00626.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1502-3885.1995.tb00626.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1502-3885.1995.tb00626.x

Bottomsets from glaciomarine deltas situated stratigraphically below and above the Weichselian maximum glaciation till at Skorgenes, western Norway, were tested for consolidation in an attempt to quantify the ice thickness at the time of deposition of the till. The value of the preconsolidation pressure in the lower unit (15 ± 1 MPa), indicates an ice thickness over the site of some 1350 ± 90 m. This is, however, only considered a minimum because values of preconsolidation pressures normally are lower than actual ice thickness would suggest due to incomplete drainage of the bed during consolidation. The estimated ice thickness indicates an ice surface some 400 m above the lower limit of the block field in the area, suggesting that this limit can not be used as a criterion for reconstructing the upper glacier surface for the Weichselian maximum glaciation in western Norway. Also, the nearest mountain peaks seemingly were completely ice covered, suggesting that no nunataks were present in that area.