Glacially Folded Outwash Near Lago Llanquihue, Southern Lake District, Chile

Schluchter, Christian; Gander, Pierre; Lowell, Thomas V.; Denton, George H.

doi:10.1111/j.0435-3676.1999.00062.x

Cited by 8 publications

(2 citation statements)

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“…Englacial thrusting of sediment produces large volumes of buried ice that are subsequently reworked during ablation to form `hummocky moraine'. Finally, in the landform record are slices of lacustrine sediment thrust at low angles into the ice‐contact slopes of moraine systems in the Chilean Lake District (Turbeck & Lowell, 1999) and sequences of folded outwash in the moraines of former glaciers in the Chilean Lake District (Schlüchter et al ., 1999).…”

Section: Discussionmentioning

confidence: 99%

Sedimentary facies and landform genesis at a temperate outlet glacier: Soler Glacier, North Patagonian Icefield

Glasser¹,

Hambrey²

2002

Sedimentology

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Glasser, N. F., Hambrey, M. J. (2002). Sedimentary facies and landform genesis at a temperate outlet glacier: Soler Glacier, North Patagonian Icefield. 49 (1), 43-64.This paper focuses on the structural glaciology, dynamics, debris transport paths and sedimentology of the forefield of Soler Glacier, a temperate outlet glacier of the North Patagonian Icefield in southern Chile. The glacier is fed by an icefall from the icefield and by snow and ice avalanches from surrounding mountain slopes. The dominant structures in the glacier are ogives, crevasses and crevasse traces. Thrusts and recumbent folds are developed where the glacier encounters a reverse slope, elevating basal and englacial material to the ice surface. Other debris sources for the glacier include avalanche and rockfall material, some of which is ingested in marginal crevasses. Debris incorporated in the ice and on its surface controls both the distribution of sedimentary facies on the forefield and moraine ridge morphology. Lithofacies in moraine ridges on the glacier forefield include large isolated boulders, diamictons, gravel, sand and fine-grained facies. In relative abundance terms, the dominant lithofacies and their interpretation are sandy boulder gravel (ice-marginal), sandy gravel (glaciofluvial), angular gravel (supraglacial) and diamicton (basal glacial). Proglacial water bodies are currently developing between the receding glacier and its frontal and lateral moraines. The presence of folded sand and laminites in moraine ridges in front of the glacier suggests that, during a previous advance, Soler Glacier over-rode a former proglacial lake, reworking lacustrine deposits. Post-depositional modification of the landform/sediment assemblage includes melting of the ice-core beneath the sediment cover, redistribution of finer material across the proglacial area by aeolian processes and fluvial reworking. Overall, the preservation potential of this landform/sediment assemblage is high on the centennial to millennial timescale.Peer reviewe

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Section: Discussionmentioning

confidence: 99%

Sedimentary facies and landform genesis at a temperate outlet glacier: Soler Glacier, North Patagonian Icefield

Glasser¹,

Hambrey²

2002

Sedimentology

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“…Such sediments have the optimal characteristics for the creation of thrust surfaces, because of their low permeability and susceptibility to deformation (Bentley, 1996; Turbek and Lowell, 1999). Moraines with a basal thrust fault and repeated internal thrusting have been reported by Schlüchter et al (1999) around Lago Llanquihue. However, it cannot be completely ruled out that these sediments are undeformed, well‐stratified pre‐Llanquihue lacustrine deposits, which were – for some reason – preserved during the last glaciation, or even that they represent local occurrences of sedimentary bedrock.…”

Section: Interpretation: Seismic Units and Seismic Faciesmentioning

confidence: 99%

Detailed seismic stratigraphy of Lago Puyehue: implications for the mode and timing of glacier retreat in the Chilean Lake District

Heirman¹,

Batist²,

Charlet³

et al. 2011

J Quaternary Science

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International audienceLago Puyehue is a glacigenic lake in the Chilean Lake District (40°S) with a complex deglaciation history. A detailed seismic-stratigraphic study of its sedimentary infill indicates a much earlier retreat of the glacier from the Lago Puyehue basin than the neighbouring glacier from the Lago Rupanco basin. Because of their close proximity, Rupanco meltwater streams played an important part in the depositional processes of Lago Puyehue. A timing discrepancy between the in-lake ages of a sediment core and the outer-lake ages of moraine deposits (re)opens the discussion on the timing of deglaciation in the Southern Hemispher

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Quaternary Palaeoecology: Central and South America, Antarctica and the Pacific Ocean Region

Frenzel

Progress in Botany

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Glacially Folded Outwash Near Lago Llanquihue, Southern Lake District, Chile

Cited by 8 publications

References 0 publications

Sedimentary facies and landform genesis at a temperate outlet glacier: Soler Glacier, North Patagonian Icefield

Sedimentary facies and landform genesis at a temperate outlet glacier: Soler Glacier, North Patagonian Icefield

Detailed seismic stratigraphy of Lago Puyehue: implications for the mode and timing of glacier retreat in the Chilean Lake District

Quaternary Palaeoecology: Central and South America, Antarctica and the Pacific Ocean Region

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