Crustal structure and tectonic provinces of the Riiser-Larsen Sea area (East Antarctica): results of geophysical studies

Leitchenkov, G.; Guseva, J.; Gandyukhin, V.; Grikurov, G. E.; Kristoffersen, Yngve; Sand, M.; Golynsky, Alexander; Aleshkova, N. D.

doi:10.1007/s11001-008-9051-z

Cited by 48 publications

(57 citation statements)

References 34 publications

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“…Miocene continental scale ice sheets in Antarctica were also documented in other borehole and seismic reflection data (e.g. Barker et al, 1988;Miller et al, 1990;Zachos et al, 2001;Maldonado et al, 2005Maldonado et al, , 2006Leitchenkov et al, 2008;Escutia et al, 2011).…”

Section: Full Glacial (Fg) Regimementioning

confidence: 53%

Deep-sea pre-glacial to glacial sedimentation in the Weddell Sea and southern Scotia Sea from a cross-basin seismic transect

et al. 2013

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Section: Full Glacial (Fg) Regimementioning

confidence: 53%

Deep-sea pre-glacial to glacial sedimentation in the Weddell Sea and southern Scotia Sea from a cross-basin seismic transect

et al. 2013

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“…For instance, as reported from seismic refraction experiments in the southernmost Weddell Sea in front of the Filchner-Ronne Ice Shelf, 10-12 km of sediments overlies a basement of stretched continental crust Kudryavtzev et al, 1987;Leitchenkov et al, 2008). Here, pre-glacial sedimentation processes were likely dominated by thermal lithospheric subsidence and variations in terrigenous sediment supply.…”

Section: Discussionmentioning

confidence: 86%

Variability in Cenozoic sedimentation and paleo-water depths of the Weddell Sea basin related to pre-glacial and glacial conditions of Antarctica

Huang

Gohl

Jokat

2014

Global and Planetary Change

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The Weddell Sea basin is of particular significance for understanding climate processes, including the generation of ocean water masses and their influence on ocean circulation as well as the dynamics of the Antarctic ice sheets. The sedimentary record, preserved below the basin floor, serves as an archive of the pre-glacial to glacial development of these processes, which were accompanied by tectonic processes in its early glacial phase. Three multichannel seismic reflection transects, in total nearly 5000 km long, are used to interpret horizons and define a seismostratigraphic model for the basin. We expand this initial stratigraphic model to the greater Weddell Sea region through a network of more than 200 additional seismic lines. Information from few boreholes is used to constrain sediment ages in this stratigraphy, supported by magnetic anomalies indicating decreasing oceanic basement ages from southeast to northwest. Using these constraints, we calculate grids to depict the depths, thicknesses and sedimentation rates of pre-glacial (145-34 Ma), transitional (34-15 Ma) and full-glacial (15 Ma to present) units. These grids allow us to compare the sedimentary regimes of the pre-glacially dominated and glacially dominated stages of Weddell Sea history. The pre-glacial deposition with thicknesses of up to 5 km was controlled by the tectonic evolution and sea-floor spreading history interacting with terrigenous sediment supply. The transitional unit shows a relatively high sedimentation rate and has thicknesses of up to 3 km, which may attribute to an early formation of the East Antarctic Ice Sheet, which was partly advanced to the coast or even inner shelf. The main deposition center of the full-glacial unit lies in front of the Filchner-Ronne Ice Shelf and has sedimentation rates of up to 140-200 m/Myr, which infers that ice sheets grounded on the middle to the outer shelf and that bottom-water currents strongly impacted the sedimentation. We further calculate paleobathymetric grids at 15 Ma, 34 Ma, and 120 Ma by using a backstripping technique. Our results provide constraints for an improved understanding of the paleo-ice sheet dynamics and paleoclimate conditions of the Weddell Sea region.

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“…For the Indian Ocean sector, our observed volumes are based on the work of Kuvaas et al (2004) and Leitchenkov et al (2007Leitchenkov et al ( , 2008 ( Table 1). The sediment is almost entirely in deep water.…”

Section: Sediment Volumementioning

confidence: 99%

Antarctic topography at the Eocene–Oligocene boundary

Wilson

Jamieson

Barrett

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

181

217

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We present a reconstruction of the Antarctic topography at the Eocene-Oligocene (ca. 34 Ma) climate transition. This provides a realistic key boundary condition for modeling the first big Antarctic ice sheets at this time instead of using the present day bedrock topography, which has changed significantly from millions of years of tectonism and erosion. We reconstruct topography using a set of tools including ice sheet-erosion models, models of thermal subsidence and plate movement. Erosion estimates are constrained with offshore sediment volumes estimated from seismic stratigraphy. Maximum and minimum topographic reconstructions are presented as indicators of the range of uncertainty. Our results point to a significant upland area in the Ross Sea/Marie Byrd Land and Weddell Sea sectors. In addition, East Antarctic coastal troughs are much shallower than today due to the restoration of material that has been selectively eroded by the evolving ice sheets. Parts of East Antarctica have not changed since the E-O boundary because they were protected under non-erosive cold-based ice. The reconstructions provide a better-defined boundary condition for modeling that seeks to understand interaction between the Antarctic ice sheet and climate, along with more robust estimates of past ice volumes under a range of orbital settings and greenhouse gas concentrations.

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Crustal structure and tectonic provinces of the Riiser-Larsen Sea area (East Antarctica): results of geophysical studies

Cited by 48 publications

References 34 publications

Deep-sea pre-glacial to glacial sedimentation in the Weddell Sea and southern Scotia Sea from a cross-basin seismic transect

Deep-sea pre-glacial to glacial sedimentation in the Weddell Sea and southern Scotia Sea from a cross-basin seismic transect

Variability in Cenozoic sedimentation and paleo-water depths of the Weddell Sea basin related to pre-glacial and glacial conditions of Antarctica

Antarctic topography at the Eocene–Oligocene boundary

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