Kolstad, Vidar

Laberg, Jan Sverre

Rydningen, Tom Arne

Vorren, Tore Ola

English

Munin - Open Research Archive

Late Cenozoic development of the continental margin off Lofoten-Vesterålenand TromsTom Arne RydningenSupervisors:T Vore orrenJan Sverre LabergVidar Kolstad Outline• General overview Ph.D. project• Study area• Current work – preliminary results07.06.20122General overview Ph D project . . • SponsorsFront ExplorationNorwegian Research Council (Norges forskningsråd)07.06.20123General overview Ph D project . . • Main goal:“Achieve a better understanding of the Late Cenozoic development of the continental margin off Lofoten-Vesterålenand Troms”• Sub-goals includes the study and elucidation of:1) quantification of the erosion and uplift of the hinterland2) quantification of the sedimentation rates on the outer margin3) reconstruction of the late Cenozoic glacial history      4) understanding of the pockmark distribution07.06.20124Study area07.06.20125Current work – Preliminary results• Preliminary title: ”Shelf geomorphology off Troms”07.06.2012607.06.20127Glacial landforms• Mega scale glacial lineations (MSGL)• Lateral shear zone moraines (LSZM)• Moraine ridges• Arched ridges07.06.20128Mega-scale glacial lineations07.06.20129Lateral shear zone moraines 07.06.201210Moraine ridges07.06.201211Arched ridges1207.06.2012Reconstruction of palaeoenvironments• LGM• Deglaciation07.06.201213LGM07.06.201214DeglaciationFive phases • Phase 1: Calving embayment Curvedridges• Phase 2: Major end moraines• Phase 3: Glacier advance Arched ridges + cross-cutting moraines• Phase 4: Iceberg plough marks• Phase 5: De Geer moraines  07.06.201215Summary• Troughs: Landforms characteristic of fast-flowing ice streams (LGM) +  landforms indicatinghalts/readvances during the deglaciation• Banks : Landforms oriented transverse to inferred ice flow (deglaciation). Some cross-cutting of landforms is observed : may indicatesmaller readvances during the deglaciation.• The transition areas between the troughs and banks are marked by slightly irregular and semi-longitudinal ridges inferred to be lateral shearzone moraines formed mainly during the LGM07.06.201216

Late Cenozoic development of the continental margin off Lofoten-Vesterålen and Troms

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Late Cenozoic development of the continental margin off Lofoten-Vesterålen and Troms

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