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Late-Holocene (post-4000 years BP) coastal dune development in Northumberland, northeast England

School of Environmental Studies, University of Ulster at Coleraine, Cromore Road, Coleraine, Co. Londonderry BT52 iSA, Northern Ireland, UK

Julian D. Orford

School of Geography, Queen' University of Belfast, Belfast BT7 INN, Northern Ireland, UK

Jasper Knight

Sharon M. Braley

School of Environmental Studies, University of Ulster at Coleraine, Cromore Road, Coleraine, Co. Londonderry BT52 iSA, Northern Ireland, UK

Ann G. Wintle

Institute of Geography and Earth Sciences, University of Wales, Aberystwyth, Dyfed SY23 3DB, Wales, UK

The recent environmental history of coastal dune systems in Northumberland, northeast England, has been examined using geomorphological, stratigraphical and sedimentological techniques linked to radiocarbon and infrared-stimulated luminescence (IRSL) dating. Stratigraphies were determined from 22 vibracores and three sections, and dune chronology was based on 28 14 C dates, from peat and soil organic horizons, and 26 IRSL dates on K-feldspar grains from within sand layers. Almost all dune systems are associated with regressive shorelines consequent upon a fall in relative sea level (RSL) from its Holocene peak, and indicate RSL functioned as a macroscale control on dune development. Where dunes are anchored on terrestrial sediment, dune expansion may have been either transgressive or regressive in nature. Where near-shore marine sediments form the dune substrate, a regressive (prograding) dune model seems most likely. Most dune building occurred during the ‘Little Ice Age’ (LIA), probably in association with specific climatic and morphosedimentary conditions, principally periods of easterly circulation, a greater frequency of severe North Sea storms, RSL fall, and sediment and accommodation space availability. Dune development in Holocene cool intervals earlier than the LIA was of limited spatial extent, suggesting some differences in prevailing conditions at those times.

Key Words: Coastal sand dunes • radiocarbon dating • IRSL dating • relative sea-level change • climatic change • ‘Little Ice Age’ • late Holocene • Northumberland

The Holocene, Vol. 11, No. 2, 215-229 (2001)
DOI: 10.1191/095968301667179797


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