We present here to the International Subcommission on Paleogene Stratigraphy (ISPS) the Monte Cagnero (MCA) section, which belongs to the pelagic succession of the Umbria–Marche Apennines (central Italy), as a potential candidate for defining the Global boundary Stratotype Section and Point (GSSP) for the base of the Chattian Stage. The section is located near the town of Piobbico and includes a complete and continuous succession of marly limestones, calcareous marls and marls rich in well–preserved planktonic foraminifera, calcareous nannofossils and dinoflagellate cysts with several intercalations of datable volcaniclastic layers, which enabled the Oligocene Integrated Stratigraphy (OLIS) Working Group to construct an integrated stratigraphic framework for this epoch. In order to further check the stratigraphic completeness of the section and constrain in time the critical interval for defining the Chattian Stage, we performed a high– resolution and detailed bio–, magneto–, and chemostratigraphic study of the MCA section, which accurately records calcareous plankton and dinoflagellate cyst biozones, magnetic reversals, seawater Sr, and C and O isotopic variations. Geochronologic results from intercalated biotite–rich volcaniclastic layers provided the means for an accurate and precise radiometric calibration of the Oligocene, and a reassessment of the accuracy of existing geochronologic time scales. In addition, we performed an astrochronologic calibration of the MCA section based on orbital tuning of high resolution magnetic susceptibility data series. The proposed Chattian GSSP is located in the lower Chron C9n at meter level 197 which contains the highest common occurrence of the planktonic foraminifer Chiloguembelina cubensis corresponding to the O4/O5 planktonic foraminiferal zonal boundary. Using the preferred astronomical tuning scheme (Tuning 1), the astronomical age is 27.82 Ma. The proposed GSSP of the MCA section bears all the stratigraphic and geochronologic attributes for driving the “golden spike”, which define the Rupelian–Chattian boundary according to the recommendations of the International Union of Geological Sciences (IUGS).

The Global Stratotype Section and Point (GSSP) for the base of the Chattian Stage (Paleogene System, Oligocene Series) at Monte Cagnero, Italy / Coccioni R.; Montanari, A.; Bice, D.M.; Brinkhuis, H.; Deino, A.; Frontalini, F.; Lirer, F.; Maiorano, P.; Monechi, S.; Pross, J.; Rochette, P.; Sagnotti, L.; Sprovieri M., Sideri M.. - In: EPISODES. - ISSN 0705-3797. - ELETTRONICO. - 41:(2018), pp. 17-32. [10.18814/epiiugs/2018/v41i1/018003]

The Global Stratotype Section and Point (GSSP) for the base of the Chattian Stage (Paleogene System, Oligocene Series) at Monte Cagnero, Italy

MONECHI, SIMONETTA;
2018

Abstract

We present here to the International Subcommission on Paleogene Stratigraphy (ISPS) the Monte Cagnero (MCA) section, which belongs to the pelagic succession of the Umbria–Marche Apennines (central Italy), as a potential candidate for defining the Global boundary Stratotype Section and Point (GSSP) for the base of the Chattian Stage. The section is located near the town of Piobbico and includes a complete and continuous succession of marly limestones, calcareous marls and marls rich in well–preserved planktonic foraminifera, calcareous nannofossils and dinoflagellate cysts with several intercalations of datable volcaniclastic layers, which enabled the Oligocene Integrated Stratigraphy (OLIS) Working Group to construct an integrated stratigraphic framework for this epoch. In order to further check the stratigraphic completeness of the section and constrain in time the critical interval for defining the Chattian Stage, we performed a high– resolution and detailed bio–, magneto–, and chemostratigraphic study of the MCA section, which accurately records calcareous plankton and dinoflagellate cyst biozones, magnetic reversals, seawater Sr, and C and O isotopic variations. Geochronologic results from intercalated biotite–rich volcaniclastic layers provided the means for an accurate and precise radiometric calibration of the Oligocene, and a reassessment of the accuracy of existing geochronologic time scales. In addition, we performed an astrochronologic calibration of the MCA section based on orbital tuning of high resolution magnetic susceptibility data series. The proposed Chattian GSSP is located in the lower Chron C9n at meter level 197 which contains the highest common occurrence of the planktonic foraminifer Chiloguembelina cubensis corresponding to the O4/O5 planktonic foraminiferal zonal boundary. Using the preferred astronomical tuning scheme (Tuning 1), the astronomical age is 27.82 Ma. The proposed GSSP of the MCA section bears all the stratigraphic and geochronologic attributes for driving the “golden spike”, which define the Rupelian–Chattian boundary according to the recommendations of the International Union of Geological Sciences (IUGS).
2018
41
17
32
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Coccioni R.; Montanari, A.; Bice, D.M.; Brinkhuis, H.; Deino, A.; Frontalini, F.; Lirer, F.; Maiorano, P.; Monechi, S.; Pross, J.; Rochette, P.; Sagnotti, L.; Sprovieri M., Sideri M.
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1089143
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