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首页> 外文期刊>Newsletters on stratigraphy >Reassessment of the Salzgitter-Salder section as a potential stratotype for the Turonian-Coniacian boundary: stable carbon isotopes and cyclostratigraphy constrained by calcareous nannofossils and palynology
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Reassessment of the Salzgitter-Salder section as a potential stratotype for the Turonian-Coniacian boundary: stable carbon isotopes and cyclostratigraphy constrained by calcareous nannofossils and palynology

机译：Reassessment of the Salzgitter-Salder section as a potential stratotype for the Turonian-Coniacian boundary: stable carbon isotopes and cyclostratigraphy constrained by calcareous nannofossils and palynology

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The abandoned limestone quarry section at Salzgitter-Salder in Germany is a potential candidate for the GSSP (Global Boundary Stratotype Section and Point) of the base of the Coniacian. We present a new high-resolution carbon isotope curve of carbonates (delta C-13(carb)) from across the Turonian-Coniacian boundary horizon (TCB) that allows for the precise definition of the Navigation Carbon Isotope Event relative to the occurrences of calcareous nannofossil, organic-walled dinoflagellate cyst (dinocyst) and inoceramid index taxa. The Navigation Event offers a robust global chemostratigraphic marker for the Turonian-Coniacian boundary. A series of subsidiary positive delta C-13(carb) events have the potential to serve as markers for regional correlation. Namely, the carbon isotope events i5, i6, and i7 can be used to correlate Salzgitter-Salder to the Bechary Bch-1 core in Bohemia. Spectral analysis shows that these small-scaled peaks are related to high-amplitude signals of precession, confirming an orbital control on delta C-13 variability. Further, these results indicate a duration of about 100 kyr for the Navigation Event. Carbon isotope and calcareous nannofossil correlation of epicontinental-sea records in Europe and the oceanic record of ODP Site 1259 in the tropical western Atlantic place the Turonian-Coniacian boundary within nannofossil zones CC13 and UC9c. An acme occurrence of the calcareous nannofossil Marthasterites furcatus occurs a short distance above the Navigation Event in Salzgitter-Salder, Bohemia and at Site 1259. An abundance minimum of the dinocyst Palaeohystrichophora infusorioides followed by a marked influx of the taxon coincides with the M. furcatus acme in the European sections. These events offer potential additional markers for the stage boundary.

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