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Geological Magazine; November 2000; v. 137; no. 6; p. 687-703
© 2000 Cambridge University Press (CUP)
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Article

Stable oxygen and carbon isotopes from brachiopods of southern England and northwestern Germany: estimation of Upper Turonian palaeotemperatures

SILKE VOIGT*

Institute of Geology, University of Cologne, Zülpicher Str. 49a, D-50674 Cologne, Germany

* E-mail: silke.voigt{at}uni-koeln.de

More than 190 articulate brachiopods from Turonian sections in northwestern Germany and southern England were studied for their stable carbon and oxygen isotopic composition, and some of them for their elemental composition. Most of the brachiopod shells are well preserved, and oxygen isotope composition reflects the temperate conditions of the European epicontinental sea. Upper Turonian mean {delta}18O values from Lower Saxony and southern England show bottom-water temperatures in the range of 14.2 to 18.2 °C ({delta}18Ow = –1.5 {per thousand} SMOW for an ice-free world). The relative trend of mean brachiopod oxygen and carbon isotopes shows a short-term (200 k.y.) increase in the mid-Upper Turonian horizons that confirms the climate cooling (~ 2 °C) observed in bulk-rock samples at different sites in Europe. Interbasinal comparisons between England and Germany show similar {delta}13C values in both basins, whereas oxygen isotopes are heavier in northwestern Germany than in England, suggesting a cool-water influence from the North Sea basin and temperate conditions in the Anglo-Paris basin.




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A. Sandler
Estimates of atmospheric CO2 levels during the mid-Turonian derived from stable isotope composition of paleosol calcite from Israel
Geological Society of America Special Papers, January 1, 2006; 416(0): 75 - 88.
[Abstract] [Full Text] [PDF]


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