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dc.identifier.citationRahman, Mohammad Najibur. Late Cenozoic Sedimentary Outbuilding Offshore Mid-Norway . Masteroppgave, University of Oslo, 2006en_US
dc.description.abstractThis study focuses on the Late Cenozoic development of the Mid-Norwegian continental margin, with emphasis on seismic sequence patterns and relative differential tectonic movements. Seismic stratigraphic framework has been integrated with palaeobathymery analysis and differential movements to get better constrain the Late Cenozoic evolution. The seismic data analysis and modelling results support a probable tectonic control on sediment supply and formation of major and minor unconformities. Mapping of the sequences show that mainland Norway and the SW Lofoten area and adjoining shelf areas were important source areas during an early stage of the outbuilding. Large water depths prevailed in the Early Pliocene, but in the Late Pliocene the basin shallowed significantly. Prograding systems entering the basin from the east are evident on Møre and Vøring basin areas. A prominent westward shift of the basin is recognized to have taken place in the northernmost part of the study area. The subsidence analysis of the Møre Basin margin reveals accelerated isostatic subsidence in the eastern part during 9.7 -2.7 Ma in response to sediment (SS-1) loading and accelerated tectonic subsidence along the whole profile during the same time interval. This was followed by prominent tectonic uplift during major prograding wedge (SS-2 to SS-5) development during 2.7 1.1 Ma and again tectonic subsidence is indicated for the later stage. The schematic back-stripping analyses of the basin indicate high gradients near basin margin and low relief at the basin axis. General palaeowater depth trends are recorded in the reconstruction; Late Miocene (SS-1) base at close to zero water depth and near coastal deposits only in the southern Møre Basin; Early Pliocene (SS-2 to SS-4) basin became deeper, southern part more deep than northern part; Late Pliocene (SS-5 and SS-6): basin started to become shallower continuing until SS-7 development. On the basis of a wide range of sequential, palaeobathymetric and depositional environments analysis of the Late Cenozoic prograding wedge, the basin evolution has been divided into three different phases; i) Initial Phase (Late Miocene Early Pliocene) during SS-1 development; ii) Main Phase (Early Pliocene to Late Pleistocene) during SS-2 to SS-6 development, and ii) Late Phase (Late Pleistocene to Recent) during SS-7 development. Sequence SS-1 (9.7-2.7 Ma) represents as initial phase of prograding into the parts of the continental margin. In main phase, five depositional sequences (SS-2 to SS-6) possibly reflect a gradual climatic deterioration and regional advances of major ice sheets across the continental shelf. High sedimentation rates prevailed, and the shelf edge prograded about 100-120 km westward during this period. In the Early Pliocene, uplift of onshore and shallow shelf areas was accompanied by accelerated offshore subsidence, a tilting of the margin that resulted in a major seaward progradation of shelf-slope sediment wedges. In the last phase sediment influx from sources areas filled the Pliocene deep basin troughs, thus reducing the overall basin relief. The uplift also diminished during this time period and aggrading units became more prominent than prograding unitsnor
dc.titleLate Cenozoic Sedimentary Outbuilding Offshore Mid-Norway : Integrated Basin Analysisen_US
dc.typeMaster thesisen_US
dc.creator.authorRahman, Mohammad Najiburen_US
dc.identifier.bibliographiccitationinfo:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft.au=Rahman, Mohammad Najibur&rft.title=Late Cenozoic Sedimentary Outbuilding Offshore Mid-Norway &rft.inst=University of Oslo&rft.date=2006&rft.degree=Masteroppgaveen_US
dc.contributor.supervisorJan Inge Faleide and Johan Petter Nystuenen_US

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