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History of the Middle Berriasian transgression on the Jura carbonate platform: revealed by high-resolution sequence- and cyclostratigraphy (Switzerland and France)

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Abstract

The Middle Berriasian deposits of the Jura platform in Switzerland and France have already been well studied in terms of high-resolution sequence stratigraphy and different orders of depositional sequences (large-, medium-, and small-scale) have been defined. The hierarchical stacking pattern of the sequences and the time span represented by the investigated interval imply that sea-level fluctuations in the Milankovitch frequency band as well as differential subsidence caused the observed changes of accommodation on the Jura platform. The present study focuses on three small-scale sequences within the transgressive interval of a large-scale sequence. The initial flooding of the platform is marked by a facies change from supra- and intertidal (Goldberg Formation) to shallow-marine subtidal deposits (Pierre Châtel Formation). Detailed logging and facies analysis of 11 sections allow recognizing small environmental changes that define elementary sequences within the well-established small-scale sequences and distinguishing between autocyclic and allocyclic processes in sequence formation. It is concluded that the small-scale sequences correspond to the 100-ka orbital eccentricity cycle, while allocyclic elementary sequences formed in tune with the 20-ka precession cycle. Based on the correlation of elementary and small-scale sequences it can be shown that the Jura platform has been flooded stepwise by repeated transgressive pulses. Differential subsidence and pre-existing platform morphology further controlled sediment accumulation and distribution during the transgression. The combination of high-resolution sequence stratigraphy and cyclostratigraphy then enables the reconstruction of hypothetical palaeogeographic maps in time increments of a few ten thousand years.

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Acknowledgments

This study results from the Ph.D. research of Jonas Tresch at the Department of Geosciences of the University of Fribourg (Switzerland). It has been financed by the University of Fribourg and the Swiss National Science Foundation (Project No 2000-067736.02), which are gratefully acknowledged. We thank Elias Samankassou, Stéphanie Védrine, and Niels Rameil for helping in the field and with the microfacies analysis, and for the discussions on the multiple aspects of carbonate sedimentology. We also thank the reviewers, Bernard Pittet and an anonymous person, for their constructive remarks.

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Tresch, J., Strasser, A. History of the Middle Berriasian transgression on the Jura carbonate platform: revealed by high-resolution sequence- and cyclostratigraphy (Switzerland and France). Int J Earth Sci (Geol Rundsch) 99, 139–163 (2010). https://doi.org/10.1007/s00531-008-0375-3

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