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Sea-level estimates during the last deglaciation based on 18O and accelerator mass spectrometry 14C ages measured in Globigerina bulloides



Sea-level estimates during the last deglaciation based on 18O and accelerator mass spectrometry 14C ages measured in Globigerina bulloides



Quaternary Research (Orlando): 313: 381-391



Coupled measurements of .delta.18O and accelerator mass spectrometry (AMS) 14C in a particular species of planktonic foraminifera may be used to calculate sea-level estimates for the last deglaciation. Of critical importance for this type of study is a knowledge of the seasonality of foraminferal growth, which can be provided by .delta.18O measurements of modern shells (core tops, plankton tows). Isotopic (.delta.18O, AMS-14C dating) and faunal records (transfer function sea surface temperature) were obtained from two cores in the North Atlantic at about 37.degree. N. The locations were chosen to obtain high sedimentation rate records removed from the major ice-melt discharge areas of the last deglaciation. Based upon Globigerina bulloides data, four .delta.18O-based sea-level estimates were calculated: -67 .+-. 7 m at 12,200 yr B.P. and -24 .+-. 8 m at about 8200 yr B.P. for core SU 81-18; -83 .+-. 10 m at 12,200 yr B.P. and -13 .+-. 11 m at about 8500 yr B.P. for core SU 81-14. Using a second working hypothesis concerning the seasonability of G. bulloides growth, it suggested that the sea-level rose by about 40 m during the millennium which followed 14,500 yr. B.P.

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Accession: 021721307

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DOI: 10.1016/0033-5894(89)90045-8


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