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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
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. (2008). 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. Geol. Soc. Am. Bull. 120(3-4): 487-511. dx.doi.org/10.1130/B25988.1
In: Geological Society of America bulletin. GEOLOGICAL SOC AMER, INC: New York, N.Y.. ISSN 0016-7606; e-ISSN 1943-2674
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| Trefwoord |
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| Author keywords |
Integrated stratigraphy; Oligocene; Rupelian/Chattian boundary; Umbria-Marche Apennines; central Italy |
| Auteurs | | Top |
- Coccioni, R.
- Marsili, A.
- Montanari, A.
- Bellanca, A.
- Neri, R.
- Bice, D.M.
- Brinkhuis, H.
- Church, N.
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- Macalady, A.
- McDaniel, A.
- Deino, A.
- Lirer, F.
- Sprovieri, M.
- Maiorano, P.
- Monechi, S.
- Nini, C.
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- Nocchi, M.
- Pross, J.
- Rochette, P.
- Sagnotti, L.
- Tateo, F.
- Touchard, Y.
- Van Simaeys, S.
- Williams, G.L.
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| 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. |
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