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TitleRe-deposited cryptotephra layers in Holocene peats linked to anthropogenic activity
AuthorSwindles, G T; Watson, E J; Galloway, J; Outram, Z; Batt, C; Bond, J; Bashford, D; Turner, K; Schofield, J E; Edwards, K J; Newton, A J; Dugmore, A J; Church, M J; Turner, V
SourceThe Holocene vol. 23, no. 10, 2013 p. 1493-1501,
Alt SeriesEarth Sciences Sector, Contribution Series 20130112
PublisherWhite Rose
Mediapaper; on-line; digital
File formatpdf
AreaShetland Island; Unst Island; Scotland; Underhoull; United Kingdom
Lat/Long WENS -1.3167 -1.3000 60.4000 60.3833
Subjectssurficial geology/geomorphology; stratigraphy; paleontology; Holocene; cryptovolcanoes; tephrochronology; volcanic rocks; pollen; pollen analyses; tephras; Cenozoic
Illustrationslocation maps; plots
Programenvironmental impacts and adaptation in the northern environment, Environmental Geoscience
AbstractTephra layers can form useful age-equivalent stratigraphic markers for correlating palaeoenvironmental sequences and they provide information about the spatio-temporal nature of past volcanic ash fall events. The use of microscopic ‘cryptotephra’ layers has both increased the stratigraphic resolution of tephra sequences in proximal areas and extended the distal application of tephrochronology to regions of the world situated far from volcanoes. Effective tephrochronology requires the discrimination between in situ tephra deposited directly from volcanic plumes and tephras that have been remobilised since their initial deposition. We present tephrostratigraphic and glass chemistry data from two proximal peat profiles (one lowland, one upland) from the Shetland Islands, UK. Both profiles contain the Hekla-Selsund tephra (deposited c. 1800–1750 cal. bc), whilst the Hekla 4 ash (c. 2395–2279 cal. bc) is present in the upland record. Overlying the Hekla-Selsund tephra are a number of distinct peaks in tephra shard abundance. The geochemistry of these layers shows that they represent re-working of the Hekla 4 and Hekla-Selsund layers rather than primary air-fall deposits. Pollen analysis of the peat sequences illustrates that these re-deposited tephra layers are coincident with a rise in heather-dominated vegetation communities (heath and/or moorland) and a subsequent intensification of burning in the landscape. We suggest that burning caused increased erosion of peats resulting in the remobilisation of tephra shards. The study demonstrates both the need for caution and the opportunities created when applying tephrochronologies in regions heavily affected by past human activity that contain both reworked tephra layers and in situ fallout.
Summary(Plain Language Summary, not published)
We examined re-deposited tephra layers in two peat profiles in the Shetland Islands, UK. Both profiles contain well known and well dated tephras. Geochemistry of tephra layers in the profile show that some of the tephra layers are reworked. Pollen analysis of the peat profiles show that intensification of burning in the landscape coincident with re-worked tephras. We propose that burning resulted in increased erosion of peats and mobilization of tephra shards. This study demonstrates the utility of pollen analysis and tephra-chronostratigraphy.