Articles | Volume 4, issue 1
https://doi.org/10.5194/gchron-4-251-2022
https://doi.org/10.5194/gchron-4-251-2022
Research article
 | 
16 May 2022
Research article |  | 16 May 2022

Cyclostratigraphy of the Middle to Upper Ordovician successions of the Armorican Massif (western France) using portable X-ray fluorescence

Matthias Sinnesael, Alfredo Loi, Marie-Pierre Dabard, Thijs R. A. Vandenbroucke, and Philippe Claeys

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Cited articles

Adams, J. A. S. and Weaver, C. E.: Thorium-to-Uranium ratios as indicators of sedimentary processes: example of concept of geochemical facies, Am. Assoc. Petr. Geol. B., 42, 387–430, https://doi.org/10.1306/0BDA5A89-16BD-11D7-8645000102C1865D, 1958. 
Beckhoff, B., Kanngiesser, B., Langhoff, N., Wedell, R., and Wolff, H. (Eds.): Handbook of Practical X-Ray Fluorescence Analysis, Springer, Berlin, New York, https://doi.org/10.1007/978-3-540-36722-2, 2006. 
Berger, A. and Loutre, M. F.: Astronomical forcing through geological time, in: Orbital Forcing and Cyclic Sequences, edited by: DeBoer, P. L. and Smith, D. G., Int. As. Sed., 15–24, https://doi.org/10.1002/9781444304039.ch2, 1994. 
Botquelen, A., Loi, A., Gourvennec, R., Leone, F., and Dabard, M.-P.: Formation et signification paléo-environnementale des concentrations coquillières: exemples de l'Ordovicien de Sardaigne et du Dévonien du Massif armoricain, C. R. Palevol., 3, 353–360, https://doi.org/10.1016/j.crpv.2004.06.003, 2004. 
Botquelen, A., Gourvennec, R., Loi, A., Pillola, G. L., and Leone, F.: Replacements of benthic associations in a sequence stratigraphic framework, examples from the Upper Ordovician of Sardinia and Lower Devonian of the Massif Armoricain, Palaeogeogr. Palaeocl., 239, 286–310, https://doi.org/10.1016/j.palaeo.2006.01.016, 2006. 
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Short summary
We used new geochemical measurements to study the expression of astronomical climate cycles recorded in the Ordovician (~ 460 million years ago) geological sections of the Crozon Peninsula (France). This type of geological archive is not often studied in this way, but as they become more important going back in time, a better understanding of their potential astronomical cycles is crucial to advance our knowledge of deep-time climate dynamics and to construct high-resolution timescales.