Orbital calibration of the late Campanian carbon isotope event in the North Sea
Posted on 2015-12-15 - 11:58
A new record of carbon isotopes, nannofossil biostratigraphy, gamma–ray and Fe content variations is presented
for the upper Campanian of the Adda–3 core, Danish Central Graben, North Sea. The studied interval provides a revision
of previously assigned late Coniacian to early Santonian ages. New biostratigraphic data indicate a late Campanian age for
the 60 m thick studied interval. The Late Campanian Event (LCE) is well recorded by a 1.5‰; negative excursion in the
bulk δ13C, along with two stepwise pre-excursion negative shifts (defining the pre–LCE). The amplitude of the LCE appears higher in the North Sea than in other areas as seen from the correlation to Germany, the UK and France. This correlation
allows identification of a new 0.4‰ negative excursion (defined as the conica event). Fe and gamma–ray variations are used
to calibrate the record with cyclostratigraphy. Fourteen 405 kyr cycles identified in the upper Campanian of Adda–3 can be
correlated to North Germany. The compilation of previous results from North Germany and correlation to Adda–3 shows
that the Boreal upper Campanian spans a total of 17 cycles each of 405 kyr; that is, 6.885 myr. The duration of the LCE is
estimated to be c. 1 myr at Adda–3 and in North Germany.
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Perdiou, Anastasios; Thibault, Nicolas; Anderskouv, Kresten; van Buchem, Frans; Joan Arie Buijs, Govert; J. Bjerrum, Christian (2015). Orbital calibration of the late Campanian carbon isotope event in the North Sea. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.2134362.v1
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AUTHORS (6)
AP
Anastasios Perdiou
NT
Nicolas Thibault
KA
Kresten Anderskouv
Fv
Frans van Buchem
GJ
Govert Joan Arie Buijs
CJ
Christian J. Bjerrum