Fold crest degradation and slump deposition in the deepwater Niger Delta,Nigeria |
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| Authors: | Byami Andrew Jolly Jeremiah Ayok Okwudiri A Anyiam |
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| Institution: | 1.Department Geology, Faculty of Physical Sciences,Ahmadu Bello University,Zaria,Nigeria;2. Department of Geology,Federal University Lokoja,Lokoja,Nigeria;3. Department of Geology,University of Nigeria,Nsukka,Nigeria |
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| Abstract: | This study uses 3D seismic reflection dataset to investigate the time-integrated growth and degradation of fault-propagation folds and associated slump deposits in the deepwater Niger Delta. The results of the analysis showed that slump deposits are sourced almost entirely from the degradation of growing fold crests—resulting in the development of seaward-facing scarps on the forelimbs of these folds. The scarps develop parallel to fold axes and have dips that range between 4° SW and 20° SW. The constant presence of fan-shaped slump deposits downdip of these scarps suggests a direct relationship to fold crest degradation. Moreover, the spatio-temporal distribution of the slumps also shows a direct relationship with the heights of seabed scarps along the strike of growing folds. Slumps have short run-out distances (generally less than 5 km); however, they also travel long distances downslope (up to 10 km) across growing structures by exploiting relay areas between growing scarps. |
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