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| Titel |
Mixing of Marine and Terrestrial Sources of Strontium in Coastal
Environments |
| VerfasserIn |
Saskia Ryan, Quentin Crowley, Eileen Deegan, Christophe Snoeck |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250146204
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| Publikation (Nr.) |
 EGU/EGU2017-10214.pdf |
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| Zusammenfassung |
| 87Sr/86Sr from bulk soils, soil extracts and plant material have been used to investigate and
quantify the extent of marine-derived Sr in the terrestrial biosphere. Samples were collected
along coastal transects and 87Sr/86Sr biosphere values (plant and soil) converge to marine
values with increasing proximity to the coast. R2values indicate highly significant trends in
certain regions.
The National Soils Database (NSDB), TELLUS and TELLUS Border datasets, all of
which are geochemical surveys have been employed to further test the extent of marine
elemental contribution. Collectively these data cover all of Ireland and Northern Ireland, with
varying degrees of sampling density. A strong spatial correlation exists between the
Chemical Index of Alteration (CIA; (Al2O3-(CaO*+Na2O)-K2O)) in topsoil (CIA <60;
27% n = 11651) and areas of blanket peat. The enrichment of Ca and Na in these
regions would suggest a significant marine geochemical contribution. Topsoil CIA
can therefore be used to identify areas likely to feature significant marine inputs
and identify regions where the 87Sr/86Sr budget may deviate from bedrock values. |
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