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| Titel |
Upper Albian-Maastrichtian calcareous plankton biostratigraphy, magnetostratigraphy and carbon isotope stratigraphy of the classical Tethyan Gubbio section (Italy) |
| VerfasserIn |
Isabella Premoli Silva, Rodolfo Coccioni, Nadia Sabatino, Mario Sprovieri, Silke Voigt |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250091042
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| Publikation (Nr.) |
 EGU/EGU2014-5308.pdf |
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| Zusammenfassung |
| The Tethyan pelagic sections at Bottaccione and Contessa Highway (Gubbio, central Italy)
are internationally recognized to be the standard reference sections for the Late
Cretaceous to Eocene geomagnetic polarity time scale calibrated to the integrated
planktonic foraminiferal and calcareous nannofossil biostratigraphy. Due to the
presence of a gap within Chron C31n in the Bottaccione section, we use two distinct
portions of these sections to construct an upper Albian-Maastrichtian complete and
well-preserved composite stratigraphic record, 333.1 m in thickness and ~37 Myr in
duration.
A refined magnetostratigraphy and planktonic foraminiferal and calcareous nannofossil
biostratigraphy is here presented for this stratigraphic succession. In particular, the recovery
of planktonic foraminifera successfully disaggregated from the hard lithologies allows to
place more precisely several bioevents that include the lowest occurrence (LO) of
Thalmanninella globotruncanoides defining the Albian/Cenomanian boundary, the LO of
Globotruncana linneiana that approximates the base of the Santonian, the LO of
Globotruncana aegyptiaca occurring earlier than previously recognized, the LO of
Pseudoguembelina palpebra, and, in addition, the well-constrained and complete pattern of
the evolutionary origin of Racemiguembelina fructicosa from Pseudotextularia elegans
through Pseudotextularia intermedia and Racemiguembelina powelli previously undetected.
Moreover, the highest occurrence of Gansserina gansseri and the LO of Plummerita
hantkeninoides allow to subdivide the latest Maastrichtian into the Pseudoguembelina
hariaensis, Pseudotextularia elegans and Plummerita hantkeninoides planktonic
foraminiferal Zones. The refined magnetobiostratigraphic framework may improve reliability
of Late Cretaceous correlations at low to middle latitude as well as paleoenvironmental,
paleoclimatic and paleoceanographic interpretations. Finally, an almost complete,
high-resolution carbon isotope curve was recently presented for the upper Albian through the
Maastrichtian interval from the Bottaccione-Contessa succession that integrated with the
updated bio-, magneto-stratigraphies provides an invaluable tool for improving correlations
through latitudes. |
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