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¹⁸O values of coexisting brachiopods and fish: Temperature differences and estimates of paleo–water depths

¹ UMR CNRS 5570, Laboratoire de Sciences de la Terre, Ecole Normale Supérieure de Lyon et Université Claude-Bernard Lyon 1, 46 Allée d'Italie, 69364 Lyon Cedex 7, France
² UMR CNRS 5561, Centre des Sciences de la Terre, Université de Bourgogne, 6 Boulevard Gabriel, 21000 Dijon, France
³ UMR CNRS 5570, Laboratoire de Sciences de la Terre, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, 69364 Lyon Cedex 7, France
⁴ UMR CNRS 5554, Laboratoire de Paléontologie, Place Eugéne Bataillon, Université de Montpellier II, 34060 Montpellier, France
⁵ UMR CNRS 6540, Centre d'Océanologie de Marseille, Station Marine d'Endoume, Rue de la Batterie-des-Lions, 13007 Marseille, France

To estimate vertical thermal gradients and paleo–water depths to marine platforms we present a new method based on the difference between ¹⁸O values of contemporaneous brachiopod carbonate and fish phosphate. Present-day marine fauna of well-known ecology from the surface to the sea floor record isotopic temperatures that agree with measured temperatures. We predict distributions of isotopic data that result from sampling strategy, basin morphology, and fauna ecology and discuss limitations. Application of the method to the Jurassic Paris-London basin gives vertical thermal variations of up to 14 °C associated with depths varying from a few meters to 170 ± 30 m. The estimated depths are minimum values and are greater than those estimated from sedimentological criteria for this ancient epicontinental sea.

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