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Integrated magnetobiostratigraphy of the middle Eocene–lower Oligocene interval from the Monte Cagnero section, central Italy

By
Luigi Jovane
Luigi Jovane
Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, European Way, Southampton SO14 3ZH, UKInstituto Oceanográfico, Universidade de São Paulo, Rua do Matão 1226, 05508-090, São Paulo, Brazil
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Jairo F. Savian
Jairo F. Savian
Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, European Way, Southampton SO14 3ZH, UKInstituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, 05508-090, São Paulo, Brazil
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Rodolfo Coccioni
Rodolfo Coccioni
Dipartimento di Scienze dell’Uomo, dell’Ambiente e della Natura, Università degli Studi di Urbino ‘Carlo Bo,’ Campus Scientifico, Località Crocicchia, 61029 Urbino, Italy
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Fabrizio Frontalini
Fabrizio Frontalini
Dipartimento di Scienze dell’Uomo, dell’Ambiente e della Natura, Università degli Studi di Urbino ‘Carlo Bo,’ Campus Scientifico, Località Crocicchia, 61029 Urbino, Italy
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Giuseppe Bancalà
Giuseppe Bancalà
Dipartimento di Scienze dell’Uomo, dell’Ambiente e della Natura, Università degli Studi di Urbino ‘Carlo Bo,’ Campus Scientifico, Località Crocicchia, 61029 Urbino, Italy
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Rita Catanzariti
Rita Catanzariti
Istituto di Geoscienze e Georisorse CNR, 56124 Pisa, Italy
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Valeria Luciani
Valeria Luciani
Università degli Studi, Ferrara, Italy
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Steven M. Bohaty
Steven M. Bohaty
Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, European Way, Southampton SO14 3ZH, UK
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Paul A. Wilson
Paul A. Wilson
Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, European Way, Southampton SO14 3ZH, UK
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Fabio Florindo
Fabio Florindo
Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Rome, Italy
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Published:
January 01, 2013

Abstract

The Monte Cagnero sedimentary section, which crops out in the northeastern Apennines near Urbania in the Umbria–Marche Basin (Italy), contains well-exposed strata spanning the middle Eocene to lower Oligocene interval. We use an integrated magnetobiostratigraphic approach to generate a high-resolution age model for the Monte Cagnero section, with the goal of obtaining a reliable chronostratigraphic framework for studying Eocene–Oligocene palaeoceanographic changes during the switch from greenhouse to icehouse conditions. The studied sediments consist of alternating reddish and greenish limestones and marlstones. A new integrated age model for the section is based on high-resolution palaeomagnetic analyses, combined with detailed planktonic foraminiferal and calcareous nannofossil biostratigraphic results. Rock magnetic measurements show that the magnetic mineralogy is dominated by a mixture of high- and low-coercivity minerals, probably representing a combination of hematite and magnetite. A robust magnetostratigraphic signal, together with the identification of key planktonic foraminiferal and nannofossil biostratigraphic events, allows construction of a detailed age model for the section. Based on these results, we infer that the section spans a continuous interval (within magnetochron resolution) from the middle Eocene to lower Oligocene (c. 41–27 Ma; Chrons C18r–C12r). The Monte Cagnero section, therefore, represents a sequence that is suitable for studying the impact of the Neo-Tethyan gateway closure on subtropical Eocene circulation and determining the nature and timing of palaeoceanographic changes in the Tethys through the late middle Eocene to early Oligocene interval.

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Contents

Geological Society, London, Special Publications

Magnetic Methods and the Timing of Geological Processes

L. Jovane
L. Jovane
Universidade de Saão Paulo, Brazil
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E. Herrero-Bervera
E. Herrero-Bervera
University of Hawaii at Manoa, USA
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L.A. Hinnov
L.A. Hinnov
Johns Hopkins University, USA
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B. Housen
B. Housen
Western Washington University, USA
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Geological Society of London
Volume
373
ISBN electronic:
9781862396364
Publication date:
January 01, 2013

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