Cenozoic reshaping of the Barents-Kara Shelf: Influence of erosion, sedimentation, and glaciation

Medvedev, Sergei; Faleide, Jan Inge; Hartz, Ebbe H.

doi:10.1016/j.geomorph.2022.108500

Cited by 5 publications

(4 citation statements)

References 71 publications

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“…However, the amount of glacial erosion in the Barents Sea is still a matter of debate and varies greatly depending on the calculation method used (Lasabuda et al, 2021;Medvedev et al, 2023). The estimate of glacial erosion used in this study is based on the compilation by Lasabuda et al (2021) who considered: (i) the previous literature; (ii) all available shelf data, from which the total Cenozoic net erosion was estimated; this was then compared with (iii) the volume of the erosional products deposited along the shelf margin, from which glacial and pre-glacial components can be separated out.…”

Section: Temperature and Pressure Effects Of Cyclic Glaciationsmentioning

confidence: 99%

“…Laberg et al (2012) considered the present-day morphology of the Barents Sea shelf, taking into account that glacial erosion was not evenly distributed but differed in troughs and banks. Medvedev et al (2023) proposed a total of about 1.65 to 2 km of Cenozoic erosion, and about 1.35 to 1.65 km of Eocene to Miocene tectonic erosion in the Olga Basin area. This estimate was based on seismic shot gathers from long-offset reflection data, and not on extrapolated borehole data as in other studies.…”

Section: Temperature and Pressure Effects Of Cyclic Glaciationsmentioning

confidence: 99%

Section: Temperature and Pressure Effects Of Cyclic Glaciationsmentioning

confidence: 99%

“…In general, erosion estimates in the Barents Sea based on changes in rock properties are complicated by the effects of ice-related compaction in places where the ice load exceeded the load of eroded sediments (Medvedev et al, 2023). This may result in an overestimation of the eroded sediments compared to the amount of sediment deposited on the shelf during the Cenozoic (Medvedev et al, 2023). Therefore uncertainties remain, as differences in the extent of glacial erosion will significantly affect subsurface temperature changes and thus the potential for microbial gas generation and the stability of gas hydrates in the Pleistocene.…”

Section: Temperature and Pressure Effects Of Cyclic Glaciationsmentioning

confidence: 99%

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Influence of Pleistocene Glaciation on Petroleum Systems and Gas Hydrate Stability in the Olga Basin Region, Barents Sea

Amberg,

Littke,

Lutz

et al. 2024

Journal of Petroleum Geology

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This study presents the results of a 2D numerical basin and petroleum systems model of the Olga Basin in the NW Barents Sea offshore northern Norway, a frontier exploration area in which there are abundant seafloor oil and gas seepages. The effects of Pleistocene ice sheet advances on rock properties and subsurface fluid migration in this area, and on seafloor hydrocarbon seepage, are not well understood. The 2D numerical model takes account of recurrent ice advances and retreats, together with related erosional and temperature effects, and investigates the influence of these parameters on fluid migration. Model results show that Pleistocene glaciations reduced the temperature in the sedimentary succession in the Olga Basin by up to 20 °C, for example in the uppermost Cretaceous and Jurassic sediments which underlie the seafloor down to a depth of 0.5 to 1 km. The decrease in temperature was in general predominantly related to the intensity of glacial erosion, which was set in this study to a depth of 600 m based on previous studies. Hydrocarbon fluids expelled from potential thermogenic source rocks of Carboniferous to Triassic ages on the SW margin of the Olga Basin migrated to the seafloor through permeable carrier beds. However, fluid migration to the surface in the NE of the study area took place along fault conduits. In a closed fault model scenario, only 0.3 Mt of hydrocarbons are modelled to have migrated along the 0.5 km wide model section; in a second scenario with partially open faults, about 22 Mt of hydrocarbons, representing about 11% of the total hydrocarbons generated by potential thermogenic source rocks in the study area, were lost to the surface during the Pleistocene. The potential for microbial methane generation in the Olga Basin was limited both during the Pleistocene and at the present day due to the significant reduction in temperature during glacial episodes, and due to the intense glacial‐related erosion of the Mesozoic to Cenozoic stratigraphy. During glacial stages, the gas hydrate stability zone beneath the ice sheet is modelled to have extended to a depth of up to 900 m for a pure methane composition, and to a depth of up to 1100 m for a possible thermogenic‐sourced mixed gas composition of 90% methane, 7% propane and 3% ethane. Gas hydrates with this mixed composition are modelled to have been stable in the Olga Basin during the last three glacial advances and into the present. These modelling results provide an insight into the key factors controlling the migration and surface leakage of hydrocarbon fluids in the Olga Basin region, and into the effects of glaciations on rock properties in a glaciated basin.

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Section: Temperature and Pressure Effects Of Cyclic Glaciationsmentioning

confidence: 99%

Section: Temperature and Pressure Effects Of Cyclic Glaciationsmentioning

confidence: 99%

Section: Temperature and Pressure Effects Of Cyclic Glaciationsmentioning

confidence: 99%

Section: Temperature and Pressure Effects Of Cyclic Glaciationsmentioning

confidence: 99%

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Influence of Pleistocene Glaciation on Petroleum Systems and Gas Hydrate Stability in the Olga Basin Region, Barents Sea

Amberg,

Littke,

Lutz

et al. 2024

Journal of Petroleum Geology

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The subsurface thermal state of Svalbard and implications for geothermal potential

Senger¹,

Nuus

Balling

et al. 2023

Geothermics

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Paleobathymetric reconstructions of the SW Barents Seaway and their implications for Atlantic–Arctic ocean circulation

Lasabuda

Hanssen

Laberg

et al. 2023

Commun Earth Environ

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Unravelling past, large-scale ocean circulation patterns is crucial for deciphering the long-term global paleoclimate. Here we apply numerical modelling to reconstruct the detailed paleobathymetry-topography of the southwestern inlet of the Barents Seaway that presently connects the Atlantic and Arctic oceans. Subaerial topography was likely enough to block Atlantic Water from entering the Barents Seaway in the earliest Eocene (c. 55 Ma). The water may have entered in the middle Eocene (c. 47 Ma) as observed from major basin subsidence, but paleotopographic highs to the east may have hindered connections between the two oceans. From the Oligocene (c. 33 Ma) until the onset of the Quaternary (c. 2.7 Ma), basin shallowing and regional shelf uplift blocked Atlantic Water from entering the Barents Seaway. Our results imply that the Fram Strait remained the sole gateway for Atlantic Water into the Arctic Ocean since its opening in the Miocene until the Quaternary.

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Cenozoic reshaping of the Barents-Kara Shelf: Influence of erosion, sedimentation, and glaciation

Cited by 5 publications

References 71 publications

Influence of Pleistocene Glaciation on Petroleum Systems and Gas Hydrate Stability in the Olga Basin Region, Barents Sea

Influence of Pleistocene Glaciation on Petroleum Systems and Gas Hydrate Stability in the Olga Basin Region, Barents Sea

The subsurface thermal state of Svalbard and implications for geothermal potential

Paleobathymetric reconstructions of the SW Barents Seaway and their implications for Atlantic–Arctic ocean circulation

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