Sr-isotope stratigraphy of the Upper Jurassic of central Portugal (Lusitanian Basin) based on oyster shells

Journal article


Publication Details

Author(s): Schneider S, Fürsich F, Werner W
Journal: International Journal of Earth Sciences
Publication year: 2009
Volume: 98
Journal issue: 8
Pages range: 1949-1970
ISSN: 1437-3254
Language: English


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. © Springer-Verlag 2008.



FAU Authors / FAU Editors

Fürsich, Franz Prof. Dr.
Naturwissenschaftliche Fakultät


External institutions with authors

Ludwig-Maximilians-Universität (LMU)
University of Cambridge


How to cite

APA:
Schneider, S., Fürsich, F., & Werner, W. (2009). Sr-isotope stratigraphy of the Upper Jurassic of central Portugal (Lusitanian Basin) based on oyster shells. International Journal of Earth Sciences, 98(8), 1949-1970. https://dx.doi.org/10.1007/s00531-008-0359-3

MLA:
Schneider, Simon, Franz Fürsich, and Winfried Werner. "Sr-isotope stratigraphy of the Upper Jurassic of central Portugal (Lusitanian Basin) based on oyster shells." International Journal of Earth Sciences 98.8 (2009): 1949-1970.

BibTeX: 

Last updated on 2018-08-08 at 02:42