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- Title
Application of seismic and sequence stratigraphic concepts to a lava-fed delta system in the Faroe-Shetland Basin, UK and Faroes.
- Authors
Wright, K. A.; Davies, R. J.; Jerram, D. A.; Morris, J.; Fletcher, R.
- Abstract
ABSTRACT Detailed seismic stratigraphic analysis of 2D seismic data over the Faroe-Shetland Escarpment has identified 13 seismic reflection units that record lava-fed delta deposition during discrete periods of volcanism. Deposition was dominated by progradation, during which the time shoreline migrated a maximum distance of ∼44 km in an ESE direction. Localised collapse of the delta front followed the end of progradation, as a decrease in volcanic activity left the delta unstable. Comparison with modern lava-fed delta systems on Hawaii suggests that syn-volcanic subsidence is a potential mechanism for apparent relative sea level rise and creation of new accommodation space during lava-fed delta deposition. After the main phase of progradation, retrogradation of the delta occurred during a basinwide syn-volcanic relative sea level rise where the shoreline migrated a maximum distance of ∼75 km in a NNW direction. This rise in relative sea level was of the order of 175-200 m, and was followed by the progradation of smaller, perched lava-fed deltas into the newly created accommodation space. Active delta deposition and the emplacement of lava flows feeding the delta front lasted ∼2600 years, although the total duration of the lava-fed delta system, including pauses between eruptions, may have been much longer.
- Subjects
SEISMOLOGICAL research; SEDIMENTATION &; deposition; VOLCANISM; LAVA flows; SEA level
- Publication
Basin Research, 2012, Vol 24, Issue 1, p91
- ISSN
0950-091X
- Publication type
Article
- DOI
10.1111/j.1365-2117.2011.00513.x