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| Titel |
Integrated high resolution chronology of lower Paleocene continental successions in Canada |
| VerfasserIn |
Anne U. Fischer, Diana Sahy, Klaudia F. Kuiper, Mohammad Sahragard Sohi, Jan R. Wijbrans, Frits J. Hilgen, Daniel J. Condon, Willem Langenberg |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250055430
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| Zusammenfassung |
| A new refined Paleogene time scale is one of the aims of the GTSnext project
(www.gtsnext.eu).
New high-precision 40Ar/39Ar (sanidine) and U-Pb (zircon) data will be integrated with
the astronomical tuning of ODP records and the Zumaia section in Spain to arrive at a better
constrained time scale.
Here we studied the upper Cretaceous-lower Paleocene Frenchman River and the lower
Paleocene Ravenscrag Butte sections (Saskatchewan, Canada), both hosting the
Cretaceous-Paleogene boundary (K-Pg). The sections consist of clastic continental fluvial and
fluvial floodplain deposits appearing as alternations of coal beds with marl and sands. Five air
fall ashes have been sampled from the K-Pg boundary interval at the Frenchman River and
Ravenscrag Butte sections. One air fall ash within the Ferris Coal which is associated
with the K-Pg boundary has been sampled at seven different sites, two times in the
Ravenscrag Butte and five times in the Frenchman River sections. The first preliminary
40Ar/39Ar and U-Pb ages integrated with new magnetostratigraphic data will presented
here.
To integrate the Canadian sections with the Zumaia (Spain) section and ODP records, we
attempt to improve the existing magnetostratigraphic data of Lerbekmo et al. (1985,
1987,1996). An ash layer north of Gubbio (Italy), 1.2 m above the K-Pg boundary has been
sampled for additional correlation. Furthermore, we explored the potential of astronomical
forcing in a fluvial sedimentary succession, using colour and magnetic susceptibility
measurements.
The research within the GTSnext project leading to these results has received funding
from the European
Community’s Seventh Framework Programme (FP7/2007-2013) under grant agreement
nË [215458]. |
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