Abstract
Strontium isotope stratigraphy was performed on oyster shells from the Late Jurassic of the Lusitanian Basin (central Portugal). This represents the first approach to obtain numerical ages for these strata. The new chronostratigraphic data provide a more precise age determination of several units. After a basin-wide hiatus sedimentation in the Late Jurassic is proven in the Cabo Mondego and Cabaços formations to resume as early as the Middle Oxfordian. The Alcobaça formation can be placed in the latest Late Oxfordian to Late Kimmeridgian, while data from the upper part of the Abadia Formation indicate an Early to Late Kimmeridgian age. The Farta Pao formation ranges from the latest Kimmeridgian to the latest Tithonian. The largely synchronous Sobral, Arranhó I, and Arranhó II members are overlain by the late Early to Late Tithonian Freixial Member. The brief, local carbonate incursion of the Arranhó I member marks the Kimmeridgian–Tithonian boundary. Oysters are shown once more to be suitable for strontium isotope studies. Their calcitic shells are often unaffected by diagenesis. In particular for marginal marine Jurassic and Cretaceous strata, where belemnites are usually absent, oysters may serve as a valuable tool for isotope stratigraphy.
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Acknowledgments
This study was financially supported by the Deutsche Forschungs-Gemeinschaft (projects Fu 131/31-2 and We 1152/2-2). Official permission for sampling was granted by M. Ramalho (Lisbon). Logistic support was offered by O. Mateus (Lourinhã). C. Helbig (Munich) prepared the slices of oyster shells. M. Joachimski (Erlangen) kindly provided access to the cathodoluminescence microscope and gave useful advice. K. Paschert (Munich) carried out the AAS measurements. E. Hegner, S. Hölzl, A. Rocholl, and S. Rummel (all Munich) helped with chemical treatment of the samples and with mass spectrometry. The oyster photographs were taken by G. Janßen (Munich). We would also like to thank G. D. Price (Plymouth) and an anonymous reviewer for their constructive criticizm on the manuscript.
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Schneider, S., Fürsich, F.T. & Werner, W. Sr-isotope stratigraphy of the Upper Jurassic of central Portugal (Lusitanian Basin) based on oyster shells. Int J Earth Sci (Geol Rundsch) 98, 1949–1970 (2009). https://doi.org/10.1007/s00531-008-0359-3
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DOI: https://doi.org/10.1007/s00531-008-0359-3