NGU 3-4.11.05 Petromaks

Pleistocene of the Pleistocene of the North Sea North Sea

Hans Petter SejrupHans Petter Sejrup

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Marine Geological Marine Geological

cruise to the North cruise to the North

Sea – Fladen area, Sea – Fladen area,

20052005

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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

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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

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Norwegian sectorNorwegian sector

Ice stream influenceIce stream influence

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•Troll

Marginal moraines

Glacial lineations

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

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Sejrup et al. 2000Sejrup et al. 2000

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Max. glaciation scenario Interglacial scenario

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UK sectorUK sector

Incisions,tills and Incisions,tills and shallow marineshallow marine

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Carr in press

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NGU 3-4.11.05 Petromaks Sejrup et al. 1987

BGS 81/26

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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

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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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725

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depth MD2010 (cm)

depth MD2289 (cm)21,19

20,09

23,9320,0225,14

25,12

27,05

28,54

22,55

23,29

25,06

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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

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

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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