Glacial geomorphology of Teesdale, northern Pennines, England: Implications for upland styles of ice stream operation and deglaciation in the British-Irish Ice Sheet

Evans, David J. A.; Dinnage, Matthew; Roberts, David H.

doi:10.1016/j.pgeola.2018.05.001

Cited by 15 publications

(7 citation statements)

References 100 publications

(167 reference statements)

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“…Application of the checklist of candidate features for glacial ripping to several published studies from these sedimentary terrains (Table 2) suggests that many marker features for glacial ripping are present at other locations that were formerly covered by Late Pleistocene ice sheets in the Northern Hemisphere (Table 2). Moreover, examples of transitions from rock breccia to rubble till and to more mature, matrix-supported diamictons, as observed at Loch Eriboll (Figure 11), were described for hard sandstones and limestones (and, in some cases, their metamorphosed equivalents) elsewhere beneath the BIIS in Scotland [16,34], northern England [35], Wales [36], and western Ireland [15]. Most of these examples are from areas such as Loch Eriboll, where till cover is thin or absent.…”

Section: Glacial Ripping and Rubble Till Formation In Other Sedimentary Rocksmentioning

confidence: 96%

Glacial Ripping in Sedimentary Rocks: Loch Eriboll, NW Scotland

2021

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Glacial ripping is a newly recognized process sequence in which subglacial erosion is triggered by groundwater overpressure. Investigations in gneiss terrain in lowland Sweden indicate that ripping involves three stages of (i) hydraulic jacking, (ii) rock disruption under subglacial traction, and (iii) glacial transport of rock blocks. Evidence for each stage includes, respectively, dilated fractures with sediment fills, disintegrated roches moutonnées, and boulder spreads. Here, we ask: can glacial ripping also occur in sedimentary rocks, and, if so, what are its effects? The case study area is in hard, thinly bedded, gently dipping Cambrian quartz-arenites at Loch Eriboll, NW Scotland. Field surveys reveal dilated, sediment filled, bedding-parallel fractures, open joints, and brecciated zones, interpreted as markers for pervasive, shallow penetration of the quartz-arenite by water at overpressure. Other features, including disintegrated rock surfaces, boulder spreads, and monomict rubble tills, indicate glacial disruption and short distance subglacial transport. The field results together with cosmogenic isotope ages indicate that glacial ripping operated with high impact close to the former ice margin at Loch Eriboll at 17.6–16.5 ka. Glacial ripping thus can operate effectively in bedded, hard sedimentary rocks, and the accompanying brecciation is significant—if not dominant—in till formation. Candidate markers for glacial ripping are identified in other sedimentary terrains in former glaciated areas of the Northern Hemisphere.

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Section: Glacial Ripping and Rubble Till Formation In Other Sedimentary Rocksmentioning

confidence: 96%

Glacial Ripping in Sedimentary Rocks: Loch Eriboll, NW Scotland

2021

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show abstract

“…Application of the checklist of candidate features for glacial ripping to several published studies from these sedimentary terrains (Table 2) suggests that many marker features for glacial ripping are present at other locations that were formerly covered by Late Pleistocene ice sheets in the Northern Hemisphere (Table 2). Moreover, examples of transitions from rock breccia to rubble till and to more mature, matrix-supported diamictons as observed at Loch Eriboll (Figure 10) have been described for hard sandstones and limestones, (and in some cases their metamorphosed equivalents), elsewhere beneath the BIIS in Scotland [16] [35], northern England [36], Wales [37] and western Ireland [15]. Most of these examples are from areas, like Loch Eriboll, where till cover is thin or absent.…”

Section: Glacial Ripping and Rubble Till Formation In Other Sedimentary Rocksmentioning

confidence: 99%

Glacial Ripping in Sedimentary Rocks: Loch Eriboll, NW Scotland

Hall¹,

Mathers²,

Krabbendam³

2021

Preprint

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Glacial ripping is a newly recognized process sequence in which subglacial erosion is triggered by groundwater overpressure. Investigations in gneiss terrain in lowland Sweden indicate that ripping involves three stages of (i) hydraulic jacking, (ii) rock disruption under subglacial traction and (iii) glacial transport of rock blocks. Evidence for each stage includes, respectively, dilated fractures with sediment fills, disintegrated roches moutonnées and boulder spreads. Here we ask: can glacial ripping also occur in sedimentary rocks, and, if so, what are its effects? The case study area is in hard, thinly bedded, gently dipping Cambrian quartz-arenites at Loch Eriboll, NW Scotland. Field surveys reveal dilated, sediment filled, bedding-parallel fractures, open joints and brecciated zones, interpreted as markers for pervasive, shallow penetration of the quartz-arenite by water at over-pressure. Other features, including disintegrated rock surfaces, boulder spreads and monomict rubble tills, indicate glacial disruption and short distance subglacial transport. The field results, together with published cosmogenic isotope ages, indicate that glacial ripping operated with high impact close to the former ice margin at Loch Eriboll at 17.6-16.5 ka. Glacial ripping thus can operate effectively in bedded, hard sedimentary rocks and the accompanying brecciation is significant – if not dominant - in till formation. Candidate markers for glacial ripping are identified in other sedimentary terrains in former glaciated areas of the Northern Hemisphere.

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“…Plateau areas were also demarcated to assess the possibility of former plateau icefields. Landforms were initially classified using descriptive terms (e.g., ridges and channels), avoiding premature genetic classifications (Darvill et al, 2017; Evans, Dinnage, & Roberts, 2018). Genetic classifications were subsequently made based on morphological diagnostic criteria, as outlined in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Past glaciation of temperate‐continental mountains: A model for a debris‐charged plateau icefield/cirque glacier landsystem in the Southern Carpathians, Romania

Balaban,

Roberts,

Evans

et al. 2023

Earth Surf Processes Landf

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Reconstructing the extent, style, timing and drivers of past mountain glaciation is crucial in both understanding past atmospheric circulation and predicting future climate change. Unlike in high‐elevation mountains situated in maritime and continental climates, less is known of past glaciation in mid‐altitude mountains, located in transitional climates, such as the Southern Carpathians of Romania. Despite these mountains harbouring a rich glacial geomorphology, this has never been systematically mapped according to well‐established morphological criteria, nor confidently related to former styles of glaciation. Therefore, filling this gap is important for not only accurately identifying glacial extents but also for establishing past glaciation styles and relating them to past ice dynamics and climate. Here, we devise the first glacial landsystem model for the Southern Carpathians, to enhance our understanding of the glaciation style and dynamics of past mountain glaciers in temperate‐continental climates. We present a geomorphological map, from which we infer the spatial and temporal evolution of glacial, periglacial and paraglacial landforms. We then assess the links between the mountain geomorphology and glaciation style and dynamics to construct a glacial landsystem model for debris‐charged plateau icefields and cirque glaciers in temperate‐continental mountain settings.

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Glacial geomorphology of Teesdale, northern Pennines, England: Implications for upland styles of ice stream operation and deglaciation in the British-Irish Ice Sheet

Cited by 15 publications

References 100 publications

Glacial Ripping in Sedimentary Rocks: Loch Eriboll, NW Scotland

Glacial Ripping in Sedimentary Rocks: Loch Eriboll, NW Scotland

Glacial Ripping in Sedimentary Rocks: Loch Eriboll, NW Scotland

Past glaciation of temperate‐continental mountains: A model for a debris‐charged plateau icefield/cirque glacier landsystem in the Southern Carpathians, Romania

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