Input of Glaciomarine Sediments along the East Antarctic Continental Margin; Depositional Processes on the Cosmonaut Sea Continental Slope and Rise and a Regional Acoustic Stratigraphic Correlation from 40° W to 80° E

Kuvaas, B.; Kristoffersen, Yngve; Guseva, J.; Leitchenkov, G.; Gandjukhin, V.; Kudryavtsev, G. A.

doi:10.1007/s11001-005-1321-4

Cited by 19 publications

(12 citation statements)

References 40 publications

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“…Antarctic marginal basins such as those in the Weddell and Riiser-Larsen seas, or off the Wilkes Land margin and in Prydz Bay, hold vast volumes of glacial sediments that have been delivered to them by (paleo) ice streams with huge drainage catchments (Kuvaas et al 2004;Close et al 2007;Leitchenkov et al 2007Leitchenkov et al , 2008Leitchenkov et al , 2014Huang et al 2014). In contrast, only a relatively minor sediment volume, depicted with a maximum thickness of just 1800 m, is preserved in the Lazarev Sea and southwest DML margin (Figs.…”

Section: Discussion Basin Sedimentation Processesmentioning

confidence: 99%

Sedimentation and potential venting on the rifted continental margin of Dronning Maud Land

Huang

Jokat

2016

Mar Geophys Res

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The relief of Dronning Maud Land (DML), formed by Middle and Late Mesozoic tectonic activity, had a strong spatial control on the early fluvial and subsequent glacial erosion and deposition. The sources, processes, and products of sedimentation along the DML margin and in the Lazarev Sea in front of the DML mountains have been barely studied. The onshore mountain belt parallel to the coast of the DML margin acts as a barrier to the transport of terrigenous sediments from the east Antarctic interior to the margin and into the Lazarev Sea. Only the Jutul-Penck Graben system allows a localized ice stream controlled transport of material from the interior of DML across its old mountain belt. Offshore, we attribute repeated largescale debris flow deposits to instability of sediments deposited locally on the steep gradient of the DML margin by high sediment flux. Two types of canyons are defined based on their axial dimensions and originated from turbidity currents and slope failures during glacial/fluvial transport. For the first time, we report pipe-like seismic structures in this region and suggest that they occurred as consequences of volcanic processes. Sedimentary processes on the DML margin were studied using seismic reflection data and we restricted the seismic interpretation to the identification of major seismic sequences and their basal unconformities.

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Section: Discussion Basin Sedimentation Processesmentioning

confidence: 99%

Sedimentation and potential venting on the rifted continental margin of Dronning Maud Land

Huang

Jokat

2016

Mar Geophys Res

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“…2) and appears to extend for at least 1200 km along the continental margin, with a maximum width of about 250 km seawards of Amundsen Bay (Fig. 1, Kuvaas et al, 2004;Kuvaas et al, 2005). The initial analysis of this sedimentary unit suggested that it might represent one of the largest drift deposits ever observed.…”

Section: Introductionmentioning

confidence: 92%

“…The result is a variety of features (Faugeres et al, 1999;Stow et al, 2002), and one example is the regional sedimentary wedge recently reported from the Cosmonaut Sea (Figs. 1 and 2, Kuvaas et al, 2004;Kuvaas et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

The Cosmonaut Sea Wedge

Solli¹,

Kuvaas²,

Kristoffersen³

et al. 2007

Open-File Report

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A set of multi-channel seismic profiles (~15000 km) acquired by Russia, Norway and Australia has been used to investigate the depositional evolution of the Cosmonaut Sea margin of East Antarctica. We recognize a regional sediment wedge below the upper part of the continental rise. The wedge, herein termed the Cosmonaut Sea Wedge, is positioned stratigraphically underneath the inferred glaciomarine section and extends for at least 1200 km along the continental margin and from 80 to about 250 km seaward or to the north. Lateral variations in the growth pattern of the wedge indicate several overlapping depocentres, which at their distal northern end are flanked by elongated mounded drifts and contourite sheets. The internal stratification of the mounded drift deposits suggests that westward flowing bottom currents reworked the marginal deposits. The action of these currents together with sea-level changes is considered to have controlled the growth of the wedge. We interpret the Cosmonaut Sea Wedge as a composite feature comprising several bottom current reworked fan systems.

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“…The existence of channel levees beneath channel-related sediment drifts is a relatively common feature of the Antarctic continental rise, having been reported from the western Antarctic Peninsular and the Riiser Larsen Sea (Kuvaas et al 2004). Contourites often appear close to the slope, associated with proximal turbidites, whereas the deeper parts of the continental rise and abyssal plains are dominated by distal turbidites.…”

Section: Variations Of Depositional Conditionsmentioning

confidence: 98%

Bottom-current control on sedimentation in the western Bellingshausen Sea, West Antarctica

2006

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A set of single-and multi-channel seismic reflection profiles provide insights into the younger Cenozoic sedimentation history of the continental rise in the western Bellingshausen Sea, west and north of Peter I Island. This area has been strongly influenced by glacially controlled sediment supply from the continental shelf, interacting with a westward-flowing bottom current. From south to north, the seismic data show changes in the symmetry and structure of a prominent sediment depocentre. Its southernmost sector provides evidence of sediment drift whereas northwards the data show a large channellevee complex, with a western levee oriented in the opposite direction to that of the drift in the south. This pattern indicates the northward-decreasing influence of a westward-flowing bottom contour current in the study area. Topographic data suggest the morphologic ridges at Peter I Island to be the main features responsible for variable bottom-current influence, these acting as barrier to the bottom current and entrained sedimentary material. West of Peter I Island, the east-orientated Coriolis force remains effective in deflecting the suspended load of the turbidity currents towards the west, thereby promoting growth of the western channel levee. Calculated sediment accumulation rates based on seismic data reveal Depocentre C to consist of younger Cenozoic material supplied by glacial transport and modified by contour currents in the western Bellingshausen Sea. These findings demonstrate that the shape, structure and distribution of sediment mounds and estimates of sediment accumulation rates can be associated to the influence of bottom currents and their long-term evolution in response to tectonic movements, ice-sheet dynamics and deep-water formation.

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Input of Glaciomarine Sediments along the East Antarctic Continental Margin; Depositional Processes on the Cosmonaut Sea Continental Slope and Rise and a Regional Acoustic Stratigraphic Correlation from 40° W to 80° E

Cited by 19 publications

References 40 publications

Sedimentation and potential venting on the rifted continental margin of Dronning Maud Land

Sedimentation and potential venting on the rifted continental margin of Dronning Maud Land

The Cosmonaut Sea Wedge

Bottom-current control on sedimentation in the western Bellingshausen Sea, West Antarctica

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