A seismo-stratigraphic analysis of glaciomarine deposits in the eastern Riiser-Larsen Sea (Antarctica)

Solli, K.; Kuvaas, B.; Kristoffersen, Yngve; Leitchenkov, G.; Guseva, J.; Gandjukhin, V.

doi:10.1007/s11001-007-9013-x

Cited by 9 publications

(2 citation statements)

References 42 publications

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“…Some areas of the Antarctic margins are also poorly surveyed, which can lead to an overestimation or underestimation of the sedimentary volume of up to 20% in these areas. Whereas the continental slope, rise, and adjacent deep sea offshore East Antarctica have been systematically mapped by Russian and Australian expeditions (Figure 1) (e.g., Close et al, 2007; Leitchenkov et al, 2007; Solli et al, 2007), most of the West Antarctic rise and deep sea are represented by much lower seismic line coverages (e.g., Gohl, Denk, et al, 2013; Kim et al, 2018; Larter et al, 2002; Lindeque, Gohl, Henrys, et al, 2016; Nitsche et al, 2000; Scheuer et al, 2006; Uenzelmann‐Neben & Gohl, 2012, 2014) (Figure 1). The Antarctic continental shelf regions are also mapped in a variety of spatial coverage, which range from excellent coverage in the Ross Sea (e.g., Bart, 2003; De Santis et al, 1999) and Prydz Bay (e.g., Powell & Cooper, 2002) to medium coverage in the Amundsen Sea Embayment (Gohl, Uenzelmann‐Neben, et al, 2013; Hochmuth & Gohl, 2013; Lowe & Anderson, 2002) and to very few lines without many crosslines in the Weddell Sea (e.g., Huang et al, 2014), the Totten glacier region (e.g., Gulick et al, 2017), and the Riiser Larsen Sea (e.g., Leitchenkov et al, 2008).…”

Section: Materials and Methods: Unlocking The Bathymetry Of The Pastmentioning

confidence: 99%

The Evolving Paleobathymetry of the Circum‐Antarctic Southern Ocean Since 34 Ma: A Key to Understanding Past Cryosphere‐Ocean Developments

Hochmuth

Gohl

Leitchenkov

et al. 2020

Geochem Geophys Geosyst

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The Southern Ocean is a key player in the climate, ocean, and atmospheric system. As the only direct connection between all three major oceans since the opening of the Southern Ocean gateways, the development of the Southern Ocean and its relationship with the Antarctic cryosphere has influenced the climate of the entire planet. Although the depths of the ocean floor have been recognized as an important factor in climate and paleoclimate models, appropriate paleobathymetric models including a detailed analysis of the sediment cover are not available. Here we utilize more than 40 years of seismic reflection data acquisition along the margins of Antarctica and its conjugate margins, along with multiple drilling campaigns by the International Ocean Discovery Program (IODP) and its predecessor programs. We combine and update the seismic stratigraphy across the regions of the Southern Ocean and calculate ocean‐wide paleobathymetry grids via a backstripping method. We present a suite of high‐resolution paleobathymetric grids from the Eocene‐Oligocene Boundary to modern times. The grids reveal the development of the Southern Ocean from isolated basins to an interconnected ocean affected by the onset and vigor of an Antarctic Circumpolar Current, as well as the glacial sedimentation and erosion of the Antarctic continent. The ocean‐wide comparison through time exposes patterns of ice sheet development such as switching of glacial outlets and the change from wet‐based to dry‐based ice sheets. Ocean currents and bottom‐water production interact with the sedimentation along the continental shelf and slope and profit from the opening of the ocean gateways.

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Section: Materials and Methods: Unlocking The Bathymetry Of The Pastmentioning

confidence: 99%

The Evolving Paleobathymetry of the Circum‐Antarctic Southern Ocean Since 34 Ma: A Key to Understanding Past Cryosphere‐Ocean Developments

Hochmuth

Gohl

Leitchenkov

et al. 2020

Geochem Geophys Geosyst

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“…Submarine channel-levee systems can have vertical reliefs of up to several hundreds of metres and lengths of several hundreds of kilometres (e.g. [64,65]). Channels form probably also due to downslope flow of dense water rejected from brine formation, as well as turbidity flows beyond the mouths of glacial troughs, when grounded ice extends to the shelf break during full glacials (e.g.…”

Section: Introductionmentioning

confidence: 99%

The Kongsfjorden Channel System offshore NW Svalbard: downslope sedimentary processes in a contour-current-dominated setting

Forwick

Laberg

Hass

et al. 2015

Arktos

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Submarine channel systems on and off glaciated continental margins can be up to hundreds of kilometres long, tens of kilometres wide and hundreds of metres deep. They result from repeated erosion and various downslope processes predominantly during glacial periods and can, therefore, provide valuable tools for the reconstruction of past ice-sheet dynamics. The Kongsfjorden Channel System (KCS) on the continental slope off northwest Svalbard provides evidence that downslope sedimentary processes are locally more dominant than regional along-slope sedimentation. It is a relatively short channel system (*120 km) that occurs at a large range of water depths (*250-4000 m) with slope gradients varying between 0°and 20°. Multiple gullies on the Kongsfjorden Trough Mouth Fan merge to small channels that further merge to a main channel. The overall location of the channel system is controlled by variations in slope gradients and the ambient regional bathymetry. The widest and deepest incisions occur in areas of the steepest slope gradients. The KCS has probably been active since *1 Ma when glacial activity on Svalbard increased and grounded ice expanded to the shelf break off Kongsfjorden repeatedly. Activity within the system was probably highest during glacials. However, reduced activity presumably took place also during interglacials.

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The Cosmonaut Sea Wedge

et al. 2008

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A seismo-stratigraphic analysis of glaciomarine deposits in the eastern Riiser-Larsen Sea (Antarctica)

Cited by 9 publications

References 42 publications

The Evolving Paleobathymetry of the Circum‐Antarctic Southern Ocean Since 34 Ma: A Key to Understanding Past Cryosphere‐Ocean Developments

The Evolving Paleobathymetry of the Circum‐Antarctic Southern Ocean Since 34 Ma: A Key to Understanding Past Cryosphere‐Ocean Developments

The Kongsfjorden Channel System offshore NW Svalbard: downslope sedimentary processes in a contour-current-dominated setting

The Cosmonaut Sea Wedge

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