The landform and sediment assemblage produced by a tidewater glacier surge in Kongsfjorden, Svalbard

Bennett, Matthew R.; Hambrey, Michael J.; Huddart, David; Glasser, Neil F.; Crawford, Kevin

doi:10.1016/s0277-3791(98)90041-5

Cited by 74 publications

(64 citation statements)

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“…Englacial and proglacial thrusting of subglacial sediment have been discussed as an important moraine-forming process at many high-Arctic glaciers, including Midtre Lovénbreen (Hambrey et al, 1997Bennett et al, 1999;Midgley et al, 2007), resulting in a hummocky assemblage of landforms with steep ice-distal slopes and in gentler rectilinear and curvilinear ice-proximal slopes . The long-term preservation potential of such landforms has been debated owing to the potential ice component within the landforms (Lukas, 2005;Graham et al, 2007;Lukas, 2007;Evans, 2009) ( Table 1).…”

Section: Implications Of Subsurface Observations On Long-term Landscamentioning

confidence: 99%

Evolution of high-Arctic glacial landforms during deglaciation

et al. 2018

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Glacial landsystems in the high-Arctic have been reported to undergo geomorphological transformation during deglaciation. This research evaluates moraine evolution over a decadal timescale at Midtre Lovénbreen, Svalbard. This work is of interest because glacial landforms developed in Svalbard have been used as an analogue for landforms developed during Pleistocene mid-latitude glaciation. Ground penetrating radar was used to investigate the subsurface characteristics of moraines. To determine surface change, a LiDAR topographic data set (obtained 2003) and a UAV-derived (obtained 2014) digital surface model processed using structure-from-motion (SfM) are also compared. Evaluation of these data sets together enables subsurface character and landform response to climatic amelioration to be linked. Ground penetrating radar evidence shows that the moraine substrate at Midtre Lovénbreen includes ice-rich (radar velocities of 0.17 m ns (mean thresholded rate of −4.39 m over the 11-year observation period). However, the debris-rich zones show a relatively low rate of surface change (mean thresholded rate of −0.98 m over the 11-year observation period), and the morphology of the debris-rich landforms appear stable over the observation period. A complex response of proglacial landforms to climatic warming is shown to occur within and between glacier forelands as indicated by spatially variable surface lowering rates. Landform response is controlled by the ice-debris balance of the moraine substrate, along with the topographic context (such as the influence of meltwater). Site-specific characteristics such as surface debris thickness and glaciofluvial drainage are, therefore, argued to be a highly important control on surface evolution in ice-cored terrain, resulting in a diverse response of high-Arctic glacial landsystems to climatic amelioration. These results highlight that care is needed when assessing the long-term preservation potential of contemporary landforms at high-Arctic glaciers. A better understanding of ice-cored terrain facilitates the development of appropriate age and climatic interpretations that can be obtained from palaeo ice-marginal landsystems.

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Section: Implications Of Subsurface Observations On Long-term Landscamentioning

confidence: 99%

Evolution of high-Arctic glacial landforms during deglaciation

et al. 2018

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“…However, the landform assemblage observed at Nordenskiöldbreen is complex and different from the assemblages described for forelands located in a valley setting or tidewater surging glaciers (cf. Bennett et al, 1996;Bennett, Hambrey, Huddart, Glasser, & Crawford, 1999;Boulton et al, 1996;Kristensen, Benn, Hormes, & Ottesen, 2009;Lønne, 2014aLønne, , 2014bLovell et al, 2015;Ottesen & Dowdeswell, 2006).…”

Section: Glacial Landsystemmentioning

confidence: 99%

Glacial geomorphology of the terrestrial margins of the tidewater glacier, Nordenskiöldbreen, Svalbard

2016

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A 1:4000 scale map of the terrestrial margins of the foreland of Nordenskiöldbreen depicts a polythermal glacial landsystem containing a record of the landform signatures of individual ice flow units that operate within the glacier snout. A 1:700 map provides a detailed overview of fluted terrain, based on unmanned aerial vehicle images captured in 2014. The pattern of landforms lying inside the Little Ice Age (LIA) latero-frontal moraine on the northern side of the fjord comprises a fluted till surface, which in turn grades into icemoulded bedrock. This signature records the recession of a single, wide ice flow unit, which was characterised by limited incorporation of subglacial material and restricted delivery of supraglacial debris. Inside the latero-frontal moraine on the south side of the fjord, a fluted surface is subordinate to a pronounced and large ice-cored moraine complex related to the confluence of five narrower ice flow units, each of which transported significant quantities of englacial and supraglacial debris at their suture zones as a series of longitudinal debris stripes. The suite of foreland landforms is diagnostic of both temperate subglacial and frozen-snout conditions, indicating the operation of a warm polythermal glacier fed by multiple flow units during the LIA. ARTICLE HISTORY

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“…Graham et al (2007) believed at the time, that the structure of ice is most likely to be overdrawn and preserved when the volume of sediments is large. It was also concluded by Bennett et al (1999) that in the case of steep thrusts more material is left at the base of thrusts and less material is uplifted. But contemporary, the discussion about steepness of thrusts is impossible, because only the lower part of the glacier is visible.…”

Section: Discussionmentioning

confidence: 99%

“…Lyså & Lønne, 2001). Bennett et al (1999) distinguished for the Kongsvegen glacier four main ice structures: stratifi cation, crevasse traces, thrust and longitudinal foliation. The last two will be considered in this paper.…”

Section: Introductionmentioning

confidence: 99%

Glacier ice structures influence on moraines developement (Hørbye glacier, Central Spitsbergen)

Szuman

Kasprzak

2010

Quaestiones Geographicae

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ABSTRACT. Geomorphological and basic sedimentological investigation of controlled moraine system was carried out at the ice surface and within the moraine complex zone of the Hørbye glacier (Central Spitsbergen). The Hørbye glacier creates controlled moraine chains regarding transversal fractures and longitudinal foliation. The forms parallel to the ice fl ow direction are represented by medial moraines, whereas transversal ones by thrustmoraines. Both arrangements are clearly visible. However, thrust and shear planes are more effective in creating forms, both on the ice surface and in the moraine complex. The longitudinal landforms are less distinct, moreover they are coarser-grained and worse rounded, in contrast to the material from shear and thrust plains which is fi ner and better rounded. The study area can be divided into three subzones: clean ice surface, debris covered ice fractures and moraine complex. The outer and inner sandur plain were not taken under consideration. It is suggested that present arrangement of both thrust or shear plains and longitudinal foliation controls formation of foreland relief. This hypothesis has a particular sense in understanding construction of modern sedimentary basins as well as the mechanism of terminoglacial relief formation with regend to ice structure.

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The landform and sediment assemblage produced by a tidewater glacier surge in Kongsfjorden, Svalbard

Cited by 74 publications

References 0 publications

Evolution of high-Arctic glacial landforms during deglaciation

Evolution of high-Arctic glacial landforms during deglaciation

Glacial geomorphology of the terrestrial margins of the tidewater glacier, Nordenskiöldbreen, Svalbard

Glacier ice structures influence on moraines developement (Hørbye glacier, Central Spitsbergen)

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