Late Cenomanian to Middle Turonian high-resolution carbon isotope stratigraphy: New data from the Münsterland Cretaceous Basin, Germany

Details Late Cenomanian to Middle Turonian high-resolution carbon isotope stratigraphy: New data from the Münsterland Cretaceous Basin, Germany Late Cenomanian to Middle Turonian high-resolution carbon isotope stratigraphy: New data from the Münsterland Cretaceous Basin, Germany

Jan 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007e%26psl.253..196v&link_type=abstract

Earth and Planetary Science Letters, Volume 253, Issue 1-2, p. 196-210.

Physics

5

Scientific paper

New high resolution carbon isotope stratigraphies from two basinal pelagic carbonate successions in northern Germany (Halle and Oerlinghausen, Münsterland Cretaceous Basin) resolve late Cenomanian to early Mid-Turonian carbon cycle variations at timescales of less than 100 kyr. Beside the major carbon isotope excursion of the late Cenomanian oceanic anoxic event (OAE 2), 11 small-scale distinct features are precisely resolved in the δ13C carbonate curve and related to boreal macrofossil zonations. The small-scale carbon isotope events correspond to secular δ13C carbonate variations identified previously in the English Chalk. The boreal high-resolution δ13C carbonate curve shows a detailed coincidence with two Tethyan δ13C curves from Italy, what demonstrates the interregional significance of the δ13C dates and allows their correlation within error limits of ± 40 kyr. Furthermore, the new δ13C curve enables the calibration of boreal and tethyan macro- and microfossil zonations. Accordingly, the Tethyan calcareous nannoplankton boundary NC13/NC14 corresponds to the boreal FO of C. woollgari, the index taxon for the Lower-Middle Turonian boundary. The cyclic appearance and the temporal spacing of the small-scale carbon isotope events suggest that orbital forcing exerted control on surface water productivity and organic matter preservation at the sea floor.

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