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The Barremian-Aptian boundary in the Poggio le Guaine core (central Italy): Evidence for magnetic polarity Chron M0r and oceanic anoxic event 1a

By
Jairo F. Savian
Jairo F. Savian
Departamento de Geofísica, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, 05508-090 São Paulo, Brazil, and Departamento de Geologia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, Avenida Bento Gonçalves 9500, 91501-970 Porto Alegre, Brazil
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Ricardo Trindade
Ricardo Trindade
Departamento de Geofísica, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, 05508-090 São Paulo, Brazil
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Liliane Janikian
Liliane Janikian
Departamento de Geofísica, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, 05508-090 São Paulo, Brazil, and Departamento de Ciências do Mar, Instituto Saúde e Sociedade, Universidade Federal de São Paulo, Avenida Almirante Saldanha da Gama, 89, Ponta da Praia 11030-400 Santos-SP, Brazil
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Luigi Jovane
Luigi Jovane
Departamento de Oceanografia Física, Instituto Oceanográfico, Universidade de São Paulo, Praça do Oceanográfico 191, 05508-120 São Paulo, Brazil
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Renato Paes de Almeida
Renato Paes de Almeida
Departamento de Geologia Sedimentar e Ambiental, Instituto de Geociências, Universidade de São Paulo, Rua do Lago 562, 05508-090 São Paulo, Brazil
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Rodolfo Coccioni
Rodolfo Coccioni
Dipartimento di Scienze Pure e Applicate, 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 Pure e Applicate, Università degli Studi di Urbino “Carlo Bo,” Campus Scientifico, Località Crocicchia, 61029 Urbino, Italy
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Marianna Sideri
Marianna Sideri
Dipartimento di Scienze Pure e Applicate, Università degli Studi di Urbino “Carlo Bo,” Campus Scientifico, Località Crocicchia, 61029 Urbino, Italy
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Milene Figueiredo
Milene Figueiredo
Centro de Pesquisas e Desenvolvimento Leopoldo Américo Miguez de Mello, Petrobras Petróleo Brasileiro S.A, Avenida Horácio Macedo 950, 21941-915 Rio de Janeiro, Brazil
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Leonardo R. Tedeschi
Leonardo R. Tedeschi
Centro de Pesquisas e Desenvolvimento Leopoldo Américo Miguez de Mello, Petrobras Petróleo Brasileiro S.A, Avenida Horácio Macedo 950, 21941-915 Rio de Janeiro, Brazil, and Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK
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Hugh C. Jenkyns
Hugh C. Jenkyns
Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK
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Published:
July 01, 2016

The Early Cretaceous represents a time interval in the greenhouse world that was characterized by dramatic changes in the paleogeography, paleoceanography, and paleoclimate of the Earth system. Furthermore, a striking, prominent feature of the geomagnetic polarity time scale is the ~34 m.y. period of the normal polarity field (Cretaceous Normal Polarity Superchron). Although marine anomalies and paleomagnetic data from deep-sea cores and land sections indicate that a reversed polarity (M0r) with a duration of ~0.4 m.y. occurred before the superchron, incomplete exposure, coupled with gaps in sampling due to the presence of marl layers, has limited the identification of M0r in a number of sections. An integrated multidisciplinary investigation of lower Cretaceous sediments at the base of the Poggio le Guaine (PLG) core (Northern Apennines, central Italy) was carried out to identify the Barremian-Aptian contact, which is defined by the M0r lower boundary. Rock magnetic measurements of the studied interval of the PLG core reveal magnetite as the main magnetic carrier. Paleomagnetic results indicate a short interval characterized by reverse polarity. This interval is in the uppermost part of the Hedbergella excelsa planktonic foraminiferal zone and in the upper part of the Chiastozygus litterarius (NC6) calcareous nannofossil zone. Stable carbon (δ13C) and oxygen (δ18O) isotopes indicate a chemostratigraphy of the PLG core with the signature of oceanic anoxic event 1a (OAE 1a). The lithological expression of OAE 1a is the organic-rich black shale unit known as the Selli Level. The comparison of our magnetostratigraphic, biostratigraphic, and chemostratigraphic records throughout the Barremian-Aptian boundary with those available from previously investigated oceanic and land-based sites allows recognition of the magnetochron M0r and OAE 1a at PLG for the first time.

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GSA Special Papers

The Stratigraphic Record of Gubbio: Integrated Stratigraphy of the Late Cretaceous–Paleogene Umbria-Marche Pelagic Basin

Marco Menichetti
Marco Menichetti
Dipartimento di Scienze Pure e Applicate, Universita` degli Studi di Urbino, 61029 Urbino (PU), Italy
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Rodolfo Coccioni
Rodolfo Coccioni
Dipartimento di Scienze Pure e Applicate, Universita` degli Studi di Urbino, 61029 Urbino (PU), Italy
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Alessandro Montanari
Alessandro Montanari
Osservatorio Geologico di Coldigioco, Cda. Coldigioco 4, 62021 Apiro (MC), Italy
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Geological Society of America
Volume
524
ISBN print:
9780813725246
Publication date:
July 01, 2016

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