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Authors: | Coccioni, R.* Marsili, A.* Montanari, A.* Bellanca, A.* Neri, R.* Bice, D. M.* Brinkhuis, H.* Church, N.* Macalady, A.* McDaniel, A.* Deino, A.* Lirer, F.* Sprovieri, M.* Maiorano, P.* Monechi, S.* Nini, C.* Nocchi, M.* Pross, J.* Rochette, P.* Sagnotti, L.* Tateo, F.* Touchard, Y.* Van Simaeys, S.* Williams, G. L.* |
Title: | Integrated stratigraphy of the Oligocene pelagic sequence in the Umbria-Marche basin (northeastern Apennines, Italy): A potential Global Stratotype Section and Point (GSSP) for the Rupelian/Chattian boundary | Journal: | GSA Bulletin | Series/Report no.: | 3-4 / 120 (2008) | Publisher: | Geological Society of America | Issue Date: | 2008 | DOI: | 10.1130/B25988.1 | Keywords: | Integrated stratigraphy Oligocene Rupelian/Chattian boundary Umbria-Marche Apennines, central Italy |
Subject Classification: | 04. Solid Earth::04.04. Geology::04.04.10. Stratigraphy 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism |
Abstract: | The Oligocene represents an important time period from a wide range of perspectives and includes significant climatic and eustatic variations. The pelagic succession of the Umbria-Marche Apennines (central Italy) includes a complete and continuous sequence of marly limestones and marls, with volcaniclastic layers that enable us to construct an integrated stratigraphic framework for this time period. We present here a synthesis of detailed biostratigraphic, magnetostratigraphic, and chemostratigraphic studies, along with geochronologic results from several biotite-rich volcaniclastic layers, which provide the means for an accurate and precise radiometric calibration of the Oligocene time scale. From this study, the interpolated ages for the Rupelian/Chattian stage boundary, located in the upper half of Chron 10n at meter level 188 in the Monte Cagnero section, and corresponding to the O4/O5 planktonic foraminiferal zonal boundary, are 28.36 Ma (paleomagnetic interpolation), 28.27 ± 0.1 Ma (direct radioisotopic dating), and 27.99 Ma (astrochronological interpolation). These ages appear to be slightly younger than those reported in recent chronostratigraphic time scale compilations. The Monte Cagnero section is a potential candidate for defining the Chattian Global Stratotype Section and Point (GSSP) and some reliable criteria are here proposed for marking the Rupelian/Chattian boundary according to International Union of Geological Sciences (IUGS) recommendations. |
Appears in Collections: | Article published / in press |
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