Paraglacial processes in recently deglaciated environments

Oliva, Marc; Mercier, Denis; Fernández, Jesús Ruíz; McColl, Sam

doi:10.1002/ldr.3283

Cited by 12 publications

(13 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast to earlier studies, the talus slopes presented in this article are older than those developing in the interaction with the Hans Glacier in the post-Little Ice Age (LIA) period (Senderak et al, 2017). The forms under study are currently developing under the influence of paraglacial processes sensu Oliva, Mercier, Ruiz-Fernández, and McColl (2019), but do not interact directly with the glacier. Additionally, the talus slopes selected for the study were compared in terms of the occurrence of buried glacial ice and the determination of its impact on the contemporary development of slopes.…”

Section: Introductioncontrasting

confidence: 71%

Processes controlling the development of talus slopes in SW Spitsbergen: The role of deglaciation and periglacial conditions

2020

View full text Add to dashboard Cite

The location of Svalbard at the interface between the warm Atlantic and cold Arctic oceans causes the terrestrial environment to be highly sensitive to contemporary climate warming. Talus slopes provide a component of glaciated areas that has been registering these changes on a scale of several thousand years. However, knowledge about their development during glacial recession is still limited. This paper fills this gap by providing unique data obtained by geophysical methods: electrical resistivity tomography (ERT) and ground-penetrating radar (GPR), regarding the talus slopes in Revdalen (SW Spitsbergen), which was last glaciated in the Neoglacial period. The results indicate that the thickness of talus slopes depends first of all on the size of the sediment supply area and only secondarily on the stage of development. The initial content of buried glacial ice in the talus deposits is differential and depends on both the rate of deglaciation and the local intensity of rock wall denudation. Over time, as a result of creep, the presence of massive ice is limited to ever lower parts of the slope. Above, there is aggradation of pore ice in delivered debris material. At the end of this stage, the buried glacial ice can form, or co-create together with pore ice, the core of subslope rock glaciers. The relatively long period since the beginning of the Revdalen deglaciation allowed a general model of the development of talus slopes in the polar environment to be prepared.

show abstract

Section: Introductioncontrasting

confidence: 71%

Processes controlling the development of talus slopes in SW Spitsbergen: The role of deglaciation and periglacial conditions

2020

View full text Add to dashboard Cite

show abstract

“…In common with other ice-free peninsulas bordering Maxwell Bay (e.g., Oliva et al, 2019;Oliva et al, 2020), Potter Peninsula is covered by till and other glaciogenic deposits (Figure 1, 2). It also possesses stratigraphic sequences with datable organic remnants and has a range of periglacial, proglacial, and paraglacial landforms (Sugden and John, 1973;Birkenmajer, 1998).…”

Section: Introductionmentioning

confidence: 57%

The impact of Holocene deglaciation and glacial dynamics on the landscapes and geomorphology of Potter Peninsula, King George Island (Isla 25 Mayo), NW Antarctic Peninsula

Barión¹,

Strelin²,

Sj³

et al. 2022

Preprint

View full text Add to dashboard Cite

The timing and impact of deglaciation and Holocene readvances on many ice-free terrestrial continental margins of the Antarctic Peninsula have been long-studied but remain debated. Potter Peninsula on King George Island (Isla 25 de Mayo), South Shetland Islands (SSI), NW Antarctic Peninsula has a detailed assemblage of glacial landforms, geomorphological features and stratigraphic exposures for constraining deglacial landscape development and glacier readvances. Here, we present a new geomorphological map of the deglaciated foreland of the Warszawa Icefield, an outlet of the Bellingshausen (Collins) Ice Cap on Potter Peninsula based on a combination of satellite imagery and new field investigations. Results from mapping and new lithofacies analysis and chronostratigraphic data from stratigraphic sections, lake sediments and moraine deposits show that deglaciation on Potter Peninsula began before c. 8.2 ka. Around c. 7.0 ka, the Warszawa Icefield and the marine terminating Fourcade Glacier readvanced across Potter Peninsula and to the outer areas of Potter Cove. Evidence of further readvances on Potter Peninsula is then absent until Warszawa Icefield front was landward of its present position on three occasions, c. 1.7–1.4 ka, after c. 0.7 ka (most likely c. 0.5–0.1 ka), and 1956 CE. Holocene deglaciation and glacier fluctuations on Potter Peninsula are broadly coeval with other ice-free areas on the South Shetland Islands and the northern Antarctic Peninsula, and likely driven by interactions between millennial-centennial scale changes in solar insolation and irradiance, the southern westerlies, and the Southern Annular Mode.

show abstract

“…Deglaciation marks a complex transition of boundary conditions for rock slope stability in which steep, unstable bedrock stores respond non-linearly to glacial inheritance. Most prehistoric RSFs in the heavily glaciated terrain of western Norway can be considered 'paraglacial' in the sense that they have occurred in a transitional period of environmental adjustments following the disturbance of deglaciation and involve changes in the intensity of landscape-forming processes (Oliva et al 2019). Although they were not directly caused by glaciation, they would not have occurred without prior glacial erosion.…”

Section: Discussionmentioning

confidence: 99%

Paraglacial Rock-Slope Failure Following Deglaciation in Western Norway

Curry

2020

World Geomorphological Landscapes

View full text Add to dashboard Cite

The paraglacial framework describes the geomorphological response to glaciation and deglaciation, whereby non-renewable, metastable, glacially-conditioned sediment sources are progressively released by a range of nonglacial processes. These include slope failures that directly modify the bedrock topography of mountain landscapes. This chapter synthesises recent research on the paraglacial evolution of western Norway's mountain rock-slopes, and evaluates the importance of glaciation, deglaciation, and associated climatic and non-climatic processes. Following an introduction to the concept of paraglacial landscape change, current understanding of rock-slope responses to deglaciation are outlined, focussing on the spatial distribution, timing, duration and causes of rock-slope failure activity. Preliminary analysis of an inventory of published ages for 49 prehistoric, moderate-large (>10 3 m 3 ) rock-slope failures (RSFs) indicates that the great majority occurred in the Late Weichselian / Early Holocene transition (~13-9 ka), within 2 ka of deglaciation. Subsequent RSFs were much smaller, though event frequency increased again at 8-7 ka and 5-4 ka BP. The majority of RSFs were not directly triggered by deglaciation (debuttressing) but were preconditioned for more than 1000 years after ice withdrawal, until slopes collapsed. It is proposed that the primary causes of failure within 2 ka of ice retreat were stress redistribution, subcritical fracture propagation, with some events possibly triggered by seismic activity. While earthquakes may have triggered renewed failure of rock-slopes in the Late Holocene, it seems likely that permafrost degradation and water supply were locally important. Priority avenues for further research are briefly identified.

show abstract

Paraglacial processes in recently deglaciated environments

Abstract: Earth's climate is changing; glaciers are retreating, ground ice is thawing, sediments are shifting, and landscapes are responding. This Special Issue entitled "Paraglacial processes in recently deglaciated

Cited by 12 publications

References 42 publications

Processes controlling the development of talus slopes in SW Spitsbergen: The role of deglaciation and periglacial conditions

Processes controlling the development of talus slopes in SW Spitsbergen: The role of deglaciation and periglacial conditions

The impact of Holocene deglaciation and glacial dynamics on the landscapes and geomorphology of Potter Peninsula, King George Island (Isla 25 Mayo), NW Antarctic Peninsula

Paraglacial Rock-Slope Failure Following Deglaciation in Western Norway

Contact Info

Product

Resources

About