Age evaluation and causation of rock-slope failures along the western margin of the Antrim Lava Group (ALG), Northern Ireland, based on cosmogenic isotope (36Cl) surface exposure dating.

DW Southall, P Wilson, P Dunlop, C Schnabel, A Rodes, P Gulliver, S Xu

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The temporal pattern of postglacial rock-slope failure in a glaciated upland area of Ireland (the western margin of the Antrim Lava Group) was evaluated using both 36Cl exposure dating of surface boulders on run-out debris and 14C dating of basal organic soils from depressions on the debris. The majority of the 36Cl ages (~ 21–15 ka) indicate that major failures occurred during or immediately following local deglaciation (~ 18–17 ka). Other ages (~ 14–9 ka) suggest some later, smaller-scale failures during the Lateglacial and/or early Holocene. The 14C ages (2.36–0.15 cal ka BP) indicate the very late onset of organic accumulation and do not provide close limiting age constraints. Rock-slope failure during or immediately following local deglaciation was probably in response to some combination of glacial debuttressing, slope steepening and paraglacial stress release. Later failures may have been triggered by seismic activity associated with glacio-isostatic crustal uplift and/or permafrost degradation consequent upon climate change. The 36Cl ages support the findings of previous studies that show the deglacial - Lateglacial period in northwest Ireland and Scotland to have been one of enhanced rock-slope failure.

LanguageEnglish
Pages235-246
JournalGeomorphology
Volume285
Early online date27 Feb 2017
DOIs
Publication statusPublished - 15 May 2017

Fingerprint

slope failure
lava
isotope
rock
deglaciation
Postglacial
organic soil
permafrost
uplift
dating
evaluation
exposure
Holocene
degradation
climate change

Keywords

  • rock-slope failures
  • Antrim Lava Group
  • 36Cl surface exposure dating
  • paraglacial

Cite this

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title = "Age evaluation and causation of rock-slope failures along the western margin of the Antrim Lava Group (ALG), Northern Ireland, based on cosmogenic isotope (36Cl) surface exposure dating.",
abstract = "The temporal pattern of postglacial rock-slope failure in a glaciated upland area of Ireland (the western margin of the Antrim Lava Group) was evaluated using both 36Cl exposure dating of surface boulders on run-out debris and 14C dating of basal organic soils from depressions on the debris. The majority of the 36Cl ages (~ 21–15 ka) indicate that major failures occurred during or immediately following local deglaciation (~ 18–17 ka). Other ages (~ 14–9 ka) suggest some later, smaller-scale failures during the Lateglacial and/or early Holocene. The 14C ages (2.36–0.15 cal ka BP) indicate the very late onset of organic accumulation and do not provide close limiting age constraints. Rock-slope failure during or immediately following local deglaciation was probably in response to some combination of glacial debuttressing, slope steepening and paraglacial stress release. Later failures may have been triggered by seismic activity associated with glacio-isostatic crustal uplift and/or permafrost degradation consequent upon climate change. The 36Cl ages support the findings of previous studies that show the deglacial - Lateglacial period in northwest Ireland and Scotland to have been one of enhanced rock-slope failure.",
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Age evaluation and causation of rock-slope failures along the western margin of the Antrim Lava Group (ALG), Northern Ireland, based on cosmogenic isotope (36Cl) surface exposure dating. / Southall, DW; Wilson, P; Dunlop, P; Schnabel, C; Rodes, A; Gulliver, P; Xu, S.

Vol. 285, 15.05.2017, p. 235-246.

Research output: Contribution to journalArticle

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