Pleistocene of the North Sea

NGU 3-4.11.05 Petromaks

Pleistocene of the Pleistocene of the North Sea North Sea

Hans Petter SejrupHans Petter Sejrup


Marine Geological Marine Geological

cruise to the North cruise to the North

Sea – Fladen area, Sea – Fladen area,

20052005


Research perspectivesResearch perspectives

• Quaternary stratigraphy and Quaternary stratigraphy and paleoenvironmentspaleoenvironments

• Paleoclimatic studiesPaleoclimatic studies - (Rapid) - (Rapid)– Meltwater & stability of marine based ice sheetsMeltwater & stability of marine based ice sheets– HoloceneHolocene

• Glacial processesGlacial processes– Ice streams….Ice streams….

• Site surveysSite surveys– Geotechnics & coring programsGeotechnics & coring programs

• Influence on hydrocarbon reservoirs Influence on hydrocarbon reservoirs (GLACIPET)(GLACIPET)– Subsidence and overburdenSubsidence and overburden


ChallengesChallenges

• Genetic interpretation of sediments and Genetic interpretation of sediments and acoustic unitsacoustic units– Till….Till….– Marine, fluvial, lacustrine sediments…Marine, fluvial, lacustrine sediments…– Methods Methods

• ChronostratigraphyChronostratigraphy– AMS, Sr isotopes…AMS, Sr isotopes…– Paleomag, amino, bio..Paleomag, amino, bio..

• Episodic style of sedimentation & erosionEpisodic style of sedimentation & erosion


Norwegian sectorNorwegian sector

Ice stream influenceIce stream influence


•Troll

Marginal moraines

Glacial lineations

NGU 3-4.11.05 PetromaksSejrup et al. 1995Sejrup et al. 1995


Sejrup et al. 2000Sejrup et al. 2000


Max. glaciation scenario Interglacial scenario


UK sectorUK sector

Incisions,tills and Incisions,tills and shallow marineshallow marine


Carr in press

NGU 3-4.11.05 Petromaks Sejrup et al. 1987

BGS 81/26


LGM glacial historyLGM glacial history

• History of reconstructionsHistory of reconstructions• Understanding of the system - Understanding of the system - chronologychronology

• Meltwater delivery how, when and Meltwater delivery how, when and volumesvolumes

• Stability of icestreams to the Stability of icestreams to the marginmargin

• Some keysites and their Some keysites and their implicationsimplications


ConclusionConclusion

• Dynamic model for the Pleistocene Dynamic model for the Pleistocene development of the North Sea ?development of the North Sea ?

• Understanding of processes and Understanding of processes and their implications (Ice streams, their implications (Ice streams, meltwater, incisions etc.)meltwater, incisions etc.)

• 3 D data potensial -long cores -3 D data potensial -long cores -fieldworkfieldwork

• Volumes and timingVolumes and timing• Modelling….Modelling….


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depth MD2010 (cm)

depth MD2289 (cm)21,19

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23,9320,0225,14

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28,54

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δ13C

MS

14C age 14

C age:

23,59

22,92

20,97

Berstad et al.Fig.4c

MD 2010

MD 2289

H3 Norwegian Sea

NGU 3-4.11.05 PetromaksStoker et al.Stoker et al.


Boulton 2002

Pre LGM dates in ScotlandPre LGM dates in ScotlandUK ice sheet c.18 ka BPUK ice sheet c.18 ka BP


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HM83-3

Pleistocene of the North Sea

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