Tethyan-to-boreal correlation in the Kimmeridgian using high-resolution sequence stratigraphy (Vocontian Basin,Swiss Jura,Boulonnais, Dorset) |
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| Authors: | C Colombié N Rameil |
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| Institution: | 1.UMR CNRS 5125 PEPS,Université Claude Bernard Lyon 1,Villeurbanne Cedex,France;2.Département de Géosciences—Géologie et Paléontologie,Université de Fribourg,Fribourg,Switzerland;3.Institute for Geology, Mineralogy and Geophysics,Ruhr-Universit?t Bochum,Bochum,Germany |
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| Abstract: | Ammonite biostratigraphy plays a central role in the definition of Jurassic stratigraphy. Nevertheless, the strong provincialism
of European ammonite species during the Kimmeridgian is a long-standing problem in correlation attempts between the boreal
and Tethyan faunal realms. Moreover, the sequence-stratigraphic interpretations for northern and southern Europe given in
the Jurassic chronostratigraphic chart of Hardenbol et al. in SEPM Publ. 60 (chart) (1998) are different. The present study
aims to resolve this correlation problem in order to better understand the connections between the boreal and the Tethyan
realms during the Kimmeridgian. A sedimentological and high-resolution sequence-stratigraphic interpretation is presented
for two unpublished sections (Cras d’Hermont and Roche de Mars) in the northern Swiss Jura, where recently discovered ammonites
display both boreal and Tethyan influences. Then, these sections are correlated with the same time interval in the central
Swiss Jura and Vocontian Basin, which belong to the Tethyan realm. Lastly, a long-distance transect is constructed between
the Vocontian Basin, Swiss Jura, northern France, and southern England, the last two areas being part of the sub-boreal realm.
The main results of this work are that: (1) third-order depositional sequences, and also higher-frequency sequences, can be
correlated from the Tethyan to the boreal realm; (2) the sequence-stratigraphic interpretation given by Hardenbol et al. in
SEPM Publ 60 (chart) (1998) for northern Europe seems to be accurate and agrees with the sequence-stratigraphic framework established in the Swiss Jura;
(3) the Late Kimmeridgian of the Swiss Jura displays boreal influences; (4) integrated high-resolution sequence-stratigraphic
and cyclostratigraphic studies are a valuable approach for bridging the correlation gap between northern and southern Europe. |
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| Keywords: | Kimmeridgian Tethyan-to-boreal stratigraphic correlation Sequence stratigraphy Cyclostratigraphy |
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