Show simple item record

dc.contributor.advisorAndreassen, Karin
dc.contributor.authorSørbø, Magnus
dc.date.accessioned2016-07-05T09:43:15Z
dc.date.available2016-07-05T09:43:15Z
dc.date.issued2016-06-01
dc.description.abstractRecently acquired datasets of multibeam, echosounder and seismic data reveal the geomorphology and distribution of seafloor craters and mounds in central Barents Sea. The study found 288 craters, 227 pingos and 119 gas flares in the area, each with its own distinctive appearance. The majority of pingos lie inside or close to craters. This indicate a connection between the two features. Inspection of the subsurface shows several faulting systems and migration pathways underneath the seabed features. Migration of hydrocarbons supplies the shallow subsurface with gas, trapping the gas inside cages of ice, to become gas hydrates. Models of the gas hydrate stability zone (GHSZ) show conditions sufficient to sustain a considerable amount of hydrates in the subsurface. Signs of gas hydrate BSRs are observable inside and outside of the study area. Four major glaciations covered the study area during Late Cenozoic. This have resulted in different climatic events, affecting the GHSZ. The GHSZ has decreased significantly since Last Glacial Maximum, leading to vast dissolution of gas hydrates and release of free gas. The pressure change, caused by the ice sheet movement, reactivated faults and enhanced supply of gas to the shallow subsurface. Gas flares at the seafloor indicate an active fluid system. The hydrates push the seafloor upwards to create submarine pingos. This has caused one or several blowouts after reaching the threshold limit of the seafloor. The depressions, created by the blowouts, are interpreted to consist of 20 % pockmarks (50-100 m), 53 % large pockmarks (100-300 m) and 27 % fluid flow craters (>300m).en_US
dc.identifier.urihttps://hdl.handle.net/10037/9378
dc.identifier.urnURN:NBN:no-uit_munin_8939
dc.language.isoengen_US
dc.publisherUiT The Arctic University of Norwayen_US
dc.publisherUiT Norges arktiske universiteten_US
dc.rights.accessRightsopenAccess
dc.rights.holderCopyright 2016 The Author(s)
dc.rights.urihttps://creativecommons.org/licenses/by-nc-sa/3.0en_US
dc.rightsAttribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)en_US
dc.subject.courseIDEOM-3901
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Marine geology: 466en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Marin geologi: 466en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Andre geofag: 469en_US
dc.subjectPockmarken_US
dc.subjectSubmarine Pingoen_US
dc.subjectGas Hydratesen_US
dc.subjectBSRen_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.subjectBarents Seaen_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Other geosciences: 469en_US
dc.titleInvestigation of seafloor craters and mounds in the central Barents Seaen_US
dc.typeMaster thesisen_US
dc.typeMastergradsoppgaveen_US


File(s) in this item

Thumbnail
Thumbnail

This item appears in the following collection(s)

Show simple item record

Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)