The Oligocene represents an important time period from a wide range of perspectives and includes signifi cant 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 defi ning 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.

Integrated stratigraphy of the Oligocene pelagic sequence in the Umbria-Marche basin (Northeastern Apennines, Italy): A potential GSSP for the Rupelian/Chattian boundary / R.COCCIONI ; S. MONECHI; A. BELLANCA ; D.BICE ; H.BRINKHUIS ; N.CHURCH ; A.DEINO ; F.LIRER ; A.MACALADY ; P.MAIORANO ; A.MARSILI ; A.MCDANIEL ; S.MONECHI ; R.NERI ; C.NINI ; M.NOCCHI ; J.PROSS ; P.ROCHETTE ; L.SAGNOTTI ; M.SPROVIERI ; F.TATEO ; Y.TOUCHARD ; S.V.SIMAEYS ; G.L.WILLIAMS. - In: GEOLOGICAL SOCIETY OF AMERICA BULLETIN. - ISSN 0016-7606. - ELETTRONICO. - 120:(2008), pp. 487-511. [10.1130/B25988.1]

Integrated stratigraphy of the Oligocene pelagic sequence in the Umbria-Marche basin (Northeastern Apennines, Italy): A potential GSSP for the Rupelian/Chattian boundary

MONECHI, SIMONETTA;
2008

Abstract

The Oligocene represents an important time period from a wide range of perspectives and includes signifi cant 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 defi ning 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.
2008
120
487
511
R.COCCIONI ; S. MONECHI; A. BELLANCA ; D.BICE ; H.BRINKHUIS ; N.CHURCH ; A.DEINO ; F.LIRER ; A.MACALADY ; P.MAIORANO ; A.MARSILI ; A.MCDANIEL ; S.MONECHI ; R.NERI ; C.NINI ; M.NOCCHI ; J.PROSS ; P.ROCHETTE ; L.SAGNOTTI ; M.SPROVIERI ; F.TATEO ; Y.TOUCHARD ; S.V.SIMAEYS ; G.L.WILLIAMS
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/253939
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