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Reconstructing the recent failure chronology of a multistage landslide complex using cosmogenic isotope concentrations: St Catherine's Point, UK

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posted on 2023-06-09, 01:42 authored by John BarlowJohn Barlow, Roger Moore, Delia M Gheorghiu
The pre-existing multistage landslide complex at St Catherine’s Point comprises a series of large rotational and translational failures that form the western section of the Isle of Wight Undercliff, UK. Cosmogenic beryllium and aluminum concentrations extracted from chert samples of the Upper Greensand are used to date the most recent sequential failure events. We use our understanding of the failure mechanics and landslide geomorphology to produce a cosmogenic exposure model that incorporates pre-failure topography into our shielding calculations. This method allowed us to date two successive landslides at the site using 10Be, the most recent of which occurred ~1064 ± 348 (± 1 s) 10Be years ago, much more recently than was previously thought. An earlier failure event is dated at ~3471 ± 348 10Be years, supporting the hypothesis that the St Catherine’s Point landslide complex was reactivated by relative sea-level rise at the end of the Holocene Climatic Optimum period.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

Geomorphology

ISSN

0169-555X

Publisher

Elsevier

Volume

268

Page range

288-295

Department affiliated with

  • Geography Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2016-06-16

First Open Access (FOA) Date

2017-06-16

First Compliant Deposit (FCD) Date

2016-06-16

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