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

Barlow, John, Moore, Roger and Gheorghiu, Delia M (2016) Reconstructing the recent failure chronology of a multistage landslide complex using cosmogenic isotope concentrations: St Catherine's Point, UK. Geomorphology, 268. pp. 288-295. ISSN 0169-555X

[img] PDF - Accepted Version
Download (634kB)

Abstract

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 σ) 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.

Item Type: Article
Keywords: Landslides, Cosmogenic dating, St Catherine’s Point
Schools and Departments: School of Global Studies > Geography
Subjects: G Geography. Anthropology. Recreation > GB Physical geography > GB0400 Geomorphology. Landforms. Terrain > GB0448 Slopes
G Geography. Anthropology. Recreation > GB Physical geography > GB0400 Geomorphology. Landforms. Terrain > GB0450 Coasts
Depositing User: John Barlow
Date Deposited: 16 Jun 2016 13:45
Last Modified: 20 Jun 2017 17:16
URI: http://sro.sussex.ac.uk/id/eprint/61530

View download statistics for this item

📧 Request an update