Astronomical calibration of the middle Eocene Contessa Highway section (Gubbio, Italy)

Details Astronomical calibration of the middle Eocene Contessa Highway section (Gubbio, Italy) Astronomical calibration of the middle Eocene Contessa Highway section (Gubbio, Italy)

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmgp11a0695c&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #GP11A-0695

Mathematics

Logic

1520 Magnetostratigraphy

Scientific paper

The Earth's Eocene to early Oligocene climatic system experienced an important transition with a long-term cooling trend from warm greenhouse to icehouse conditions. Today, it is a priority to understand the causes and consequences that drove this major climatic change. In this context, a multidisciplinary study has been carried out on the middle Eocene sedimentary succession of the Contessa Highway (Gubbio, Italy). Spectral analysis and CWT technique of seven multidisciplinary high-resolution records demonstrate that climatic changes, in the western Neo-Tethys (Umbria-Marche basin) during the middle Eocene, are sensitive to eccentricity, obliquity and precession astronomical variations. In the Contessa Highway section, the lithology shows high-frequency cyclicity, which is strongly modulated by insolation. The lithologic cyclostratigraphy combined with the ~7 My-long astronomically driven climate proxy records, provide a first astronomical calibration of the middle Eocene. Here, we present astronomical age for the bio-magnetostratigraphic events along the middle Eocene Contessa Highway section. These astronomically calibrated ages mark significant improvements for the dating of biostratigraphic events and minimal correction to chronostratigraphy. Based on the available high-resolution bio-, isotope- and magnetostratigraphy and the precise multi-proxy astronomical tuning of the sedimentary record we retain that the Contessa Highway section represents an excellent candidate as GSSP for the Lutetian/Bartonian boundary.

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