Multiproxy cretaceous-paleogene boundary event stratigraphy

Autor(en)

Matthias Sinnesael, Alessandro Montanari, Fabrizio Frontalini, Rodolfo Coccioni, T Gattacceca, C. Snoeck, Wencke Wegner, Christian Koeberl, L. Morgan, N. De WInter, D. J. DePaolo, Ph Claeys

Abstrakt

The complete and well-studied pelagic carbonate successions from the Umbria- Marche basin (Italy) permit the study of the event-rich stratigraphic interval around the Cretaceous-Paleogene boundary (e.g., Deccan volcanism, boundary impact, Paleocene recovery, and climate). To test the robustness of various proxy records (bulk carbonate δ

¹³C, δ

¹⁸O,

⁸⁷Sr/

⁸⁶Sr, and Ca, Fe, Sr, and Mn concentrations) inside the Umbria-Marche basin, several stratigraphically equivalent sections were investigated (Bottaccione Gorge, Contessa Highway, Fornaci East quarry, Frontale, Morello, and Petriccio core). Besides the classical Gubbio sections of Bottaccione and Contessa, the new Morello section is put forward as an alternative location for this stratigraphic interval because it is less altered by burial diagenesis. Elemental profiles (Ca, Fe, Sr, Mn) acquired by handheld X-ray fluorescence (pXRF) efficiently provide regional chemostratigraphic and paleoenvironmental information. The Deccan volcanism, the Cretaceous-Paleogene boundary, the characteristic pattern of the Sr/Ca profile across the boundary driven by the extinction and recovery of coccolithophores, and the Dan- C2 hyperthermal event are examples of such recorded paleoenvironmental events. Moreover, cyclostratigraphic analyses of proxies of detrital input (magnetic susceptibility and Fe concentrations) show the imprint in the sedimentary record of a 2.4 m.y. eccentricity minimum around 66.45-66.25 Ma, and suggest that the occurrence of the Dan-C2 hyperthermal event was astronomically paced.

Organisation(en)

Department für Lithosphärenforschung

Externe Organisation(en)

Vrije Universiteit Brussel, Carleton College, Osservatorio Geologico di Coldigioco, Università degli Studi di Urbino "Carlo Bo", Università degli Studi di Genova, Institut Geographique National (IGN), Naturhistorisches Museum Wien (NHM), United States Geological Survey, Lawrence Berkeley National Laboratory

Seiten

133-158

Anzahl der Seiten

26

DOI

https://doi.org/10.1130/2019.2542(07)

Publikationsdatum

2019

Peer-reviewed

Ja

ÖFOS 2012

105105 Geochemie

ASJC Scopus Sachgebiete

Geology

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/cc1608ef-0453-407f-8547-ef1bde4cdfcd