Subglacial Preservation of Valley Morphology at Amundsenisen, Western Dronning Maud Land, Antarctica

Näslund, Jens‐Ove

doi:10.1002/(sici)1096-9837(199705)22:5<441::aid-esp696>3.0.co;2-4

Cited by 34 publications

(35 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is consistent with evidence that although focussed glacial erosion by wet-based ice and local alpine glaciers in the Jutulsessen area excavated a ca. 1200 m deep valley system at between 34 and 14 Ma, an early Permian palaeo-plateau is otherwise preserved (Näslund, 1997(Näslund, , 2001.…”

Section: Resultsmentioning

confidence: 99%

Antarctic topography at the Eocene–Oligocene boundary

Wilson

Jamieson

Barrett

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

181

217

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Antarctic topography at the Eocene–Oligocene boundary

Wilson

Jamieson

Barrett

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

181

217

View full text Add to dashboard Cite

show abstract

“…Glacial reshaping Glacial reshaping makes interpretation of landforms in Greenland generally more difficult than in unglaciated areas. The glacial impact is known to be differentiated (Sugden, 1978;Kleman, 1994;Glasser, 1995;Näslund, 1997) and the glacial erosion has been of two main kinds. First, outlet glaciers from the main ice sheet of Greenland have caused substantial erosion along the Vaigat and Uummannaq fjords and along the Aaffarsuaq valley.…”

Section: Origin and Causes Of Upliftmentioning

confidence: 99%

Cenozoic uplift of Nuussuaq and Disko, West Greenland—elevated erosion surfaces as uplift markers of a passive margin

et al. 2006

View full text Add to dashboard Cite

“…Another important condition, when interpreting glaciated areas, is the protecting effect of ice sheets and ice caps during most of the glaciations due to cold based conditions (e.g., Sugden, 1978;Kleman, 1994). These conditions have been at hand in many high areas during the whole period with Late Cenozoic glaciations (Kleman and Hättestrand, 1999), while glacial erosion has been most effective in low areas (Sugden, 1978;Glasser, 1995;Näslund, 1997).…”

Section: Introductionmentioning

confidence: 99%