Sea-Level Estimates during the Last Deglaciation Based on δ18O and Accelerator Mass Spectrometry 14C Ages Measured in Globigerina bulloides

Quaternary Research - Tập 31 - Trang 381-391 - 1989
Edouard Bard1,2, Richard Fairbanks2, Maurice Arnold1, Pierre Maurice1, Josette Duprat3, Jean Moyes3, Jean-Claude Duplessy1
1Centre des Faibles Radioactivités, CNRS-CEA, 91190 Gif-sur-Yvette France
2Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York 10964, USA
3Institut de Géologie du Bassin d'Aquitaine, Université de Bordeaux, 1, Talence, France

Tóm tắt

AbstractCoupled measurements of δ18O 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 foraminiferal growth, which can be provided by δ18O measurements of modern shells (core tops, plankton tows). Isotopic (δ18O, AMS-14C dating) and faunal records (transfer function sea surface temperature) were obtained from two cores in the North Atlantic at about 37°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 δ18O-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 is suggested that the sea-level rose by about 40 m during the millennium which followed 14,500 yr B.P.

Tài liệu tham khảo

10.1130/0016-7606(1979)90<689:ROOTUS>2.0.CO;2 10.1098/rstb.1977.0102 10.1038/298841a0 10.1007/BF01054479 10.1016/0031-0182(81)90036-5 10.1038/328791a0 10.1126/science.191.4232.1131 Ruddiman, 1987, Synthesis: The ocean ice/sheet record, The Geology of North America, Vol. K-3, 137 10.1007/BF00301694 10.1038/336056a0 10.1130/0016-7606(1961)72[1707:LQSLAD]2.0.CO;2 10.1126/science.157.3789.684 10.1007/BF00300959 10.1130/0016-7606(1958)69[39:SSMTOS]2.0.CO;2 10.1130/0016-7606(1978)89<277:ROOTUS>2.0.CO;2 10.1130/0016-7606(1979)90<692:ROOTUS>2.0.CO;2 Craig, 1965, Deuterium and oxygen-18 variations in the ocean and the marine atmosphere, 9 Mix, 1987, The oxygen-isotope record of glaciation, The Geology of North America, Vol. K-3, 111 10.1029/GB001i003p00251 10.1130/0091-7613(1980)8<102:NRDFTI>2.0.CO;2 10.1016/0033-5894(78)90100-X 10.1126/science.139.3552.332 10.1038/327477a0 Shepard, 1960, Rise of sea level along Northwest gulf of Mexico, 338 10.1073/pnas.48.10.1728 10.1016/0277-3791(87)90003-5 10.1126/science.162.3858.1121 Curray, 1965, Late Quaternary history, continental shelves of United States, 723 10.1126/science.158.3806.1301 10.1029/PA003i004p00509 10.1016/0031-0182(81)90034-1 10.1016/0031-0182(81)90096-1 Imbrie, 1971, A new micropaleontological method for quantitative paleoclimatology: Application to a late Pleistocene Caribbean core, 71 10.1016/0033-5894(84)90085-1 10.1126/science.219.4591.1423 10.1016/0277-3791(85)90015-0 10.1175/1520-0477(1977)058<1270:GAOOD>2.0.CO;2 10.1029/PA003i006p00635 10.1130/0091-7613(1983)11<275:ICIALQ>2.0.CO;2 10.1130/0091-7613(1978)6<56:LQSCRB>2.0.CO;2 10.1063/1.1671982 10.1130/0016-7606(1975)86<1073:NCSSAE>2.0.CO;2
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Quaternary Research

Tập 31

381-391

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