AMS 14C Dating on the Fossvogur Sediments, Iceland

Andersen, G J; Heinemeier, Jan; Nielsen, H.L.; Rud, N.; Thomsen, M.S.; Johnsen, S. J.; Sveinbjörnsdóttir, Árný E.; Hjartarson, Árni

doi:10.1017/s0033822200012182

Cited by 52 publications

(34 citation statements)

References 15 publications

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“…All 14C measurements were performed on the Aarhus EN tandem accelerator (Andersen et al 1989) and the S13C measurements were performed on the mass spectrometer at the Science Institute, Reykjavik, Iceland. The quoted uncertainties are based on ion-counting statistics.…”

Section: Methodsmentioning

confidence: 99%

Radiocarbon Dating of Shells and Foraminifera from the Skagen Core, Denmark: Evidence of Reworking

et al. 1995

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ABSTRACT. We report on 69 radiocarbon dates of mollusk shells and benthic foraminifera from the upper 132 m of the marine shelf sediments of the Skagen Core (220 m total length). The dated sequence covers the Late Glacial and the Holocene (from 15 ka BP to Recent). Sedimentation rates range from 1 to 70 m ka'1. The macrofossil shell dates follow a smooth curve constituting an age model for dating the sediments. The foraminiferal dates fall into two groups: those that agree exactly with the mollusk shells and those that deviate substantially, always being older than the shells by as much as 5 ka. One mixed foraminiferal sample consisted of members from both groups, and as a result, the age deviation of the sample turned out to be some weighted average. The data indicate that the age deviations are due to admixtures of reworked older foraminifera.

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Section: Methodsmentioning

confidence: 99%

Radiocarbon Dating of Shells and Foraminifera from the Skagen Core, Denmark: Evidence of Reworking

et al. 1995

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“…All AMS 14 C measurements were carried out using the EN tandem accelerator at Aarhus University (Denmark). The dating results are reported according to international convention (Stuiver and Polach 1977) as conventional 14 C dates in 14 C yr BP (before AD 1950) based on the measured 14 C/ 13 C ratio corrected for the natural isotopic fractionation by normalizing the result to the standard  13 C value of -25‰ PDB (Andersen et al 1989). The conventional 14 C dates were calibrated using the OxCal v 3.10 program (Bronk Ramsey 1995, 2001).…”

Section: Ams and Stable Isotope Measurementsmentioning

confidence: 99%

Successful AMS ¹⁴C Dating of Non-Hydraulic Lime Mortars from the Medieval Churches of the Åland Islands, Finland

et al. 2010

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ABSTRACT. Fifteen years of research on accelerator mass spectrometry (AMS) radiocarbon dating of non-hydraulic mortar has now led to the establishment of a chronology for the medieval stone churches of the Åland Islands (Finland), where no contemporary written records could shed light on the first building phases. In contrast to other material for dating, well-preserved mortar is abundantly available from every building stage.We have gathered experience from AMS dating of 150 Åland mortar samples. Approximately half of them have age control from dendrochronology or from 14 C analysis of wooden fragments in direct contact with the mortar. Of the samples with age control, 95% of the results agree with the age of the wood. The age control from dendrochronology, petrologic microscopy, chemical testing of the mortars, and mathematical modeling of their behavior during dissolution in acid have helped us to define criteria of reliability to interpret the 14 C results when mortar dating is the only possibility to constrain the buildings in time. With these criteria, 80% of all samples reached conclusive results, and we have thus far been able to establish the chronology of 12 out of the 14 churches and chapels, while 2 still require complementary analyses.

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“…For the age model of this paper, all the 14 C dates have been calibrated with CALIB4 (Stuiver et al, 1998a). The marine model calibration curve with ∆R=0, corresponding to a reservoir correction of approximately 400 years ( Stuiver et al, 1998b; see also Andersen et al, 1989), has been used for the Holocene record, while a reservoir correction of 800 years (∆R=400) has been applied for older samples ( Table 1, Table 2, Table 3 and Table 4). The present-day reservoir age of the coastal waters of Iceland is consistent with the ∆R=0 value, and Eiríksson et al (2000a) did show that a ∆R=0 value is also applicable at the level of the Saksunarvatn ash (9000 14 C yr BP), whereas a reservoir correction of 750-800 years was necessary at the Vedde Ash level (10300 14 C yr BP).…”

Section: Chronologymentioning

confidence: 99%

Environmental changes off North Iceland during the deglaciation and the Holocene: foraminifera, diatoms and stable isotopes

Knudsen

Jiang

Jansen

et al. 2004

Marine Micropaleontology

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A combined study of foraminifera, diatoms and stable isotopes in marine sediments off North Iceland records major changes in sea surface conditions since about 15800 cal years (yr) BP. Results are presented from two gravity cores obtained at about 400 m water depth from two separate sedimentary basins on each side of the submarine Kolbeinsey Ridge. The chronology of the sedimentary record is based partly on AMS 14 C dates, partly on the Vedde and the Saksunarvatn tephra markers, as well as the historical Hekla AD 1104 tephra. During the regional deglaciation, the planktonic foraminiferal assemblages are characterised by consistently high percentages of sinistrally coiled Neogloboquadrina pachyderma. However, major environmental variability is reflected by changes in stable isotope values and diatom assemblages. Low 18 O values indicate a strong freshwater peak as well as possible brine formation by sea-ice freezing during a pre-Bølling interval (Greenland Stadial 2), corresponding to the Heinrich 1 event. The foraminifera suggest a strong concurrent influence of relatively warm and saline Atlantic water, and both the foraminifera and the diatoms suggest mixing of cold and warm water masses. Similar but weaker environmental signals are observed during the Younger Dryas (Greenland Stadial 1) around the level of the Vedde Ash. Each freshwater peak is succeeded by an interval of severe cooling both at the beginning of the Bølling-Allerød Interstadial Complex (Greenland Interstadial 1) and during the Preboreal, presumably associated with the onset of intense deep water formatiom in the Nordic Seas. The Holocene thermal optimum, between 10200 and about 7000 cal years (yr) BP, is interrupted by a marked cooling of the surface waters around 8200 cal yr BP. This cold event is clearly expressed by a pronounced increase in the percentages of sinistrally coiled N. pachyderma, corresponding to a temperature decrease of about 3°C. A general cooling in the area is indicated after 7000-6000 cal yr BP, both by the diatom data and by the planktonic foraminiferal data. After a severe cooling around 6000 cal yr BP, the planktonic foraminiferal assemblages suggest a warmer interval between 5500 and 4500 cal yr BP. Minor temperature fluctuations are reflected both in the foraminiferal and in the diatom data in the upper part of the record, but the time resolution of the present data is not high enough to pick up details in environmental changes through the late Holocene.

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AMS 14C Dating on the Fossvogur Sediments, Iceland

Cited by 52 publications

References 15 publications

Radiocarbon Dating of Shells and Foraminifera from the Skagen Core, Denmark: Evidence of Reworking

Radiocarbon Dating of Shells and Foraminifera from the Skagen Core, Denmark: Evidence of Reworking

Successful AMS ¹⁴C Dating of Non-Hydraulic Lime Mortars from the Medieval Churches of the Åland Islands, Finland

Environmental changes off North Iceland during the deglaciation and the Holocene: foraminifera, diatoms and stable isotopes

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AMS 14C Dating on the Fossvogur Sediments, Iceland

Cited by 52 publications

References 15 publications

Radiocarbon Dating of Shells and Foraminifera from the Skagen Core, Denmark: Evidence of Reworking

Radiocarbon Dating of Shells and Foraminifera from the Skagen Core, Denmark: Evidence of Reworking

Successful AMS 14C Dating of Non-Hydraulic Lime Mortars from the Medieval Churches of the Åland Islands, Finland

Environmental changes off North Iceland during the deglaciation and the Holocene: foraminifera, diatoms and stable isotopes

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Successful AMS ¹⁴C Dating of Non-Hydraulic Lime Mortars from the Medieval Churches of the Åland Islands, Finland