Late Cenozoic evolution of high-gradient trough mouth fans and canyons on the glaciated continental margin offshore Troms, northern Norway—Paleoclimatic implications and sediment yield

Rydningen, Tom Arne; Laberg, Jan Sverre; Kolstad, Vidar

doi:10.1130/b31302.1

Cited by 18 publications

(19 citation statements)

References 78 publications

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“…Although using a different age model, a similar increasing trend was also reported by Engen et al (), from 0.27 m/Kyr for their NB‐4A to 0.3 m/Kyr for their NB‐4B. From the Troms margin offshore northern Norway, a mass balance study of the glacial succession showed an average sedimentation rate of 0.15–0.22 m/Kyr (Rydningen et al, ), that is, very similar to our numbers (Table ).…”

Section: Discussionsupporting

confidence: 91%

“… Description— Low‐ to medium‐amplitude and relatively continuous inclined reflections characterize this seismic facies (Figure ). Interpretation— SF2 represents a prograding sediment wedge and is interpreted as a high‐gradient TMF following Rydningen et al (). Other terms have previously been used for similar deposits including glacigenic prograding wedge (Dahlgren et al, ), glacial delta (Nielsen et al, ), and glacial‐sedimentary prism (Batchelor & Dowdeswell, ). …”

Section: Resultsmentioning

confidence: 96%

“…This is confirmed by ice sheet modeling showing that the Bjørnøya TMF received sediment from a significant portion of the Barents Sea shelf during the last glaciation (Patton et al, ). A considerably smaller catchment area has been inferred for the Troms margin TMFs, a likely analogue to the setting northeast of Svalbard, resulting in a much smaller volume of sediments along this part of the margin (Rydningen et al, ).…”

Section: Discussionmentioning

confidence: 99%

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Late Cenozoic Erosion Estimates for the Northern Barents Sea: Quantifying Glacial Sediment Input to the Arctic Ocean

Lasabuda

Geissler

Laberg

et al. 2018

Geochem Geophys Geosyst

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A compilation of seismic data has been used to characterize the Neogene‐Quaternary sedimentary succession of the northwestern Barents Sea continental margin to better understand the paleoenvironmental evolution and the sedimentary processes involved. The Neogene strata are dominated by contourites related to the ocean circulation established from the opening of the Fram Strait connecting the Atlantic and the Arctic Oceans (< ~17.5 Ma). The upper Plio‐Pleistocene strata (< ~2.7 Ma) are dominated by stacked gravity‐driven deposits forming trough‐mouth fans that were sourced from paleo‐ice streams. Within the interfan areas, contouritic sedimentation prevailed. Thus, this margin provides an example of interaction of glacigenic debris flows, contour currents, and hemipelagic/glacimarine sedimentary processes. A total of ~29,000 km3 of sediments with an average sedimentation rate of about 0.24 m/Kyr were estimated. These numbers reflect the sediment input to this part of the Arctic Ocean from the northwestern Barents Sea shelf and adjacent land areas. For the first time, the average erosion and erosion rates for this source area are estimated using a mass balance approach. Approximately 410–650 m of erosion has on average occurred, corresponding to an average erosion rate of ~0.15–0.24 m/Kyr. These rates are comparable to those reported from other glaciated margins, including the western Svalbard and mid‐Norway margin, but up to only half the rates reported from the western Barents Sea margin. This variation is interpreted due to the size and bedrock types of the drainage area, ice dynamics, and the continental slope gradient.

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Section: Discussionsupporting

confidence: 91%

Section: Resultsmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

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Late Cenozoic Erosion Estimates for the Northern Barents Sea: Quantifying Glacial Sediment Input to the Arctic Ocean

Lasabuda

Geissler

Laberg

et al. 2018

Geochem Geophys Geosyst

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“…a–d). A similar pattern of early Quaternary ice‐sheet expansion and shelf progradation, followed by the initiation of efficient mid‐ to late Quaternary ice streams within deep cross‐shelf troughs, has been recognized on the mid‐ and north Norwegian margins (Ottesen et al ., ; Rydningen et al ., ).…”

Section: Discussion: Ice‐sheet and Ocean‐current Configuration Througmentioning

confidence: 98%

“…The south‐western margin of the SIS is assumed to have expanded significantly later in the Quaternary compared with the onset of large‐scale glaciation further north in Norway and the Barents Sea, which occurred from around 1.5 Ma (Solheim et al ., ; Andreassen et al ., ; Knies et al ., ; Ottesen et al ., ; Rydningen et al ., ). However, our results suggest that the south‐western SIS margin advanced repeatedly to the palaeo‐shelf break in the northern North Sea during the early Quaternary (Fig.…”

Section: Discussion: Ice‐sheet and Ocean‐current Configuration Througmentioning

confidence: 99%

Quaternary evolution of the northern North Sea margin through glacigenic debris‐flow and contourite deposition

Batchelor

Ottesen

Dowdeswell

2017

J Quaternary Science

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The Norwegian Channel Ice Stream of the Scandinavian Ice Sheet extended across the northern North Sea margin during the mid‐ to late Quaternary, eroding older sediment from the continental shelf. Consequently, little is known about early Quaternary sedimentation on this margin. We use two‐ and three‐dimensional seismic‐reflection data to investigate changing sediment volumes and sources in the northern North Sea through the Quaternary. The northern North Sea Basin was infilled during the early Quaternary by intercalated glacigenic debris‐flows and contourites, which provide a record of the delivery of glacigenic sediment to the slope and the intensity of North Atlantic thermohaline circulation during early Quaternary glacial–interglacial cycles. The infilling of the basin reduced accommodation and led to the deflection of mid‐ to late Quaternary sediments into the Norwegian Sea, forming the North Sea Fan. Close to the onset of the mid‐Quaternary, the south‐western Scandinavian Ice Sheet margin was drained by an ice stream located beneath Måløy Plateau, 60 km east of the Last Glacial Maximum Norwegian Channel Ice Stream. The southward‐flowing Norwegian Sea Bottom Water current was directed into the partially filled northern North Sea Basin during the early Quaternary, and deflected progressively northwards as the basin became infilled.

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The North Sea and Mid-Norwegian continental margin

Sejrup¹,

Hjelstuen²

2022

European Glacial Landscapes

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Late Cenozoic evolution of high-gradient trough mouth fans and canyons on the glaciated continental margin offshore Troms, northern Norway—Paleoclimatic implications and sediment yield

Cited by 18 publications

References 78 publications

Late Cenozoic Erosion Estimates for the Northern Barents Sea: Quantifying Glacial Sediment Input to the Arctic Ocean

Late Cenozoic Erosion Estimates for the Northern Barents Sea: Quantifying Glacial Sediment Input to the Arctic Ocean

Quaternary evolution of the northern North Sea margin through glacigenic debris‐flow and contourite deposition

The North Sea and Mid-Norwegian continental margin

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