SOTBAKKEN GP
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Generell informasjon
Generell informasjon Attributt Verdi Litostrat. enhet Den litostratigrafiske enhetens offisielle navn.SOTBAKKEN GPNPDID for litostrat. enhet Sokkeldirektoratets entydige nøkkel for litostratigrafiske enheter.154Nivå Angir den litostratigrafiske enhetens nivå. Lovlige verdier: GROUP, FORMATION, MEMBER.GROUP -
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Beskrivelse
Sotbakken Group
NameFrom a submarine slope north of Vannøy around 70°40'N, 19°40'E. The unit corresponds to T6 or Nordkapp Group of earlier usage.Type areaBlock 7119/12.ThicknessThe group shows a general increase in thickness from approximately 300 m near the southern margins of the Hammerfest Basin, to approximately 1 km in the most sorthwestern wells in the basin.LithologyThe group is dominated by claystones, with only minor siltstone, tuffaceous and carbonate horizons.Basal StratotypeThe base of the constituent Torsk Formation is defined by changes in sonic and density log responses. The basal contact is unconformable and represents an important depositional break in the latest Cretaceous and early Paleocene throughout the Tromsøflaket area.Lateral extent and variationDue to a shift in tectonic regime in the middle Oligocene, large areas of the Barents Shelf east of the Senja Ridge were uplifted and subjected to erosion, which lasted until the early Pliocene. The erosional products were deposited west of the ridge. As a result of this postdepositional erosion, the upper part of the Sotbakken Group is not preserved in the eastern parts of Tromsøflaket. The lower parts are probably present throughout the Barents Shelf, but younger sequences are only preserved over the Ringvassøy - Loppa Fault Complex and in the Tromsø Basin (c.f. Spencer et al. 1984).AgePreserved sequences show a late Paleocene (Thanetian) to early/middle Eocene (Ypresian/ Lutetian) age in central and eastern parts of the Hammerfest Basin. Oligocene sequences may also be present in western wells.Depositional environmentThe whole Barents Shelf was transgressed in the mid-Paleocene and a uniform sequence of outer sublittoral to deep shelf claystones were deposited.CorrelationThe group is time-equivalent to the van Mijenfjord Group on Svalbard; however, the van Mijenfjordenen Group shows a much more marginal marine development with intercalated coarse and fine clastic units.SubdivisionAt present only one formation is recognized within the group.Source-
Dalland, A., Worsley, D. and Ofstad, K. (eds.) 1988: A lithostratigraphic scheme for the Mesozoic and Cenozoic succession offshore mid- and northern Norway. NPD-Bulletin No. 4, 65 pp.
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