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Late Holocene sea levels in Ireland
Carter, Richard W. G. ; Devoy, Robert J. N. ; Shaw, John
JQS. Journal of quaternary science, 1989, Vol.4 (1), p.7-24
[Periódico revisado por pares]
Essex: John Wiley & Sons, Ltd
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Título:
Late Holocene sea levels in Ireland
Autor:
Carter, Richard W. G.
;
Devoy, Robert J. N.
;
Shaw, John
Assuntos:
Earth sciences
;
Earth, ocean, space
;
Exact sciences and technology
;
Geochronology
;
geomorphology
;
Holocene
;
Ireland
;
Isotope geochemistry. Geochronology
;
Marine and continental quaternary
;
palaeoecology
;
Sea level
;
Surficial geology
É parte de:
JQS. Journal of quaternary science, 1989, Vol.4 (1), p.7-24
Notas:
ArticleID:JQS3390040103
istex:89A67623597C4C6C14188302BC283A86D1BE913A
ark:/67375/WNG-JM8TW2NC-3
Descrição:
The course of Irish sea levels during the late‐Holocene is not well‐known, yet it is an understanding of this period that will prove crucial in the definition and management of future sea‐level changes. The coastline of Ireland embraces wide environmental and glacio‐isostatic contrasts, which serve and, to some extent, control sea‐level events at both local and regional scales, making definitive resolution of relative sea‐level changes difficult. In the southwest, the picture is of inexorable relative sea‐level rise. Studies in Co. Kerry show a gradual submergence of terrestrial facies, by estuarine and, in places, marine materials. Pollen and diatom studies, together with 14C dates, suggest a decreasing rate of relative sea‐level rise in the last 2500 years, often associated with geomorphological changes. Sites on the south coast of Ireland confirm the evidence from the southwest. In Cork Harbour, recent relative sea‐level rise since 2100 BP was responsible for marginal land submergence, while elsewhere rising water levels appear to have caused rapid barrier migrations and coast erosion. Palaeoenvironmental evidence from this region suggests a distinctive pattern of sea‐level change, associated with sedimentary and/or crustal dynamics, which is not encountered elsewhere in northwest Europe. The overall rate of relative sea‐level change on the south and southwest coasts falls between 0.6 and 1.1 mm/year over the last 5000 years. In the north, there is a clear east to west variation in relative sea‐level trends, following an isostatically‐controlled peak (+3 to −1 m OD) between 6500 BP (east) and 3500 BP (west). Falling sea levels from 3500 to 1500 BP have been followed by a general slow rise, although there are still local anomalies to this pattern, most noticeably at Malin Head, where sea level is currently falling at 2.4mm/year. Relative sea‐level signatures in Ireland differ markedly between the north and south coasts. Furthermore geomorphological and ecological contexts of this rise vary from east to west, providing a complex all‐Ireland framework for future investigations.
Editor:
Essex: John Wiley & Sons, Ltd
Idioma:
Inglês
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