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Late Holocene solifluction history reconstructed using tephrochronology

Martin P. Kirkbride and Andrew J. Dugmore
Geological Society, London, Special Publications, 242, 145-155, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.242.01.13
Martin P. Kirkbride
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Abstract

Phases of activity of four solifluction lobes at an altitude of 750–800 m are dated by tephrochronology at Snaefell, central eastern Iceland (64°48′ N 15°33′ E). The sample includes sorted lobes with tread gradients of 3–11° and unsorted (turf-banked terraces) in slope-foot locations. Trenches through lobe fronts reveal detailed internal structures picked out by multiple tephra layers. The tephras V1717, V1477, Ö1362, V870, Hekla-3 (2900 years bp and Hekla-4 (3800 years bp) provide isochronous surfaces of known age whose deformation and disturbance indicate mass movement and/or cryoturbation of the soil cover. Undisturbed soil including the Hekla-3 tephra indicates an absence of solifluction prior to 2900 years bp. Several centuries after Hekla-3, gravel-rich horizons mark wide-spread frost heave and solifluction of hillslopes. Later stabilization of these lobes allowed the accumulation of aprons of aeolian sediment below lee-side risers. These aprons contain in situ mediaeval tephras, dating the inception of solifluction to a considerable time prior to Norse settlement. The likely period of this first phase of solifluction is the Later Bog Period of the Subatlantic, c. 2500-1000 years bp. The aprons are currently being overridden and deformed by solifluction lobes reactivated in the Little Ice Age.

  • © The Geological Society of London 2005

Abstract

Phases of activity of four solifluction lobes at an altitude of 750–800 m are dated by tephrochronology at Snaefell, central eastern Iceland (64°48′ N 15°33′ E). The sample includes sorted lobes with tread gradients of 3–11° and unsorted (turf-banked terraces) in slope-foot locations. Trenches through lobe fronts reveal detailed internal structures picked out by multiple tephra layers. The tephras V1717, V1477, Ö1362, V870, Hekla-3 (2900 years bp and Hekla-4 (3800 years bp) provide isochronous surfaces of known age whose deformation and disturbance indicate mass movement and/or cryoturbation of the soil cover. Undisturbed soil including the Hekla-3 tephra indicates an absence of solifluction prior to 2900 years bp. Several centuries after Hekla-3, gravel-rich horizons mark wide-spread frost heave and solifluction of hillslopes. Later stabilization of these lobes allowed the accumulation of aprons of aeolian sediment below lee-side risers. These aprons contain in situ mediaeval tephras, dating the inception of solifluction to a considerable time prior to Norse settlement. The likely period of this first phase of solifluction is the Later Bog Period of the Subatlantic, c. 2500-1000 years bp. The aprons are currently being overridden and deformed by solifluction lobes reactivated in the Little Ice Age.

  • © The Geological Society of London 2005

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Geological Society, London, Special Publications: 242 (1)
Geological Society, London, Special Publications
Volume 242
2005
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Late Holocene solifluction history reconstructed using tephrochronology

Martin P. Kirkbride and Andrew J. Dugmore
Geological Society, London, Special Publications, 242, 145-155, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.242.01.13
Martin P. Kirkbride
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Andrew J. Dugmore
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Late Holocene solifluction history reconstructed using tephrochronology

Martin P. Kirkbride and Andrew J. Dugmore
Geological Society, London, Special Publications, 242, 145-155, 1 January 2005, https://doi.org/10.1144/GSL.SP.2005.242.01.13
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