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The Eocene Thermal Maximum 3: Reading the environmental perturbations at Gubbio (Italy)

By
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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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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Rita Catanzariti
Rita Catanzariti
Istituto di Geoscienze e Georisorse Consiglio Nazionale delle Ricerche, 56124 Pisa, Italy
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Luigi Jovane
Luigi Jovane
Instituto Oceanográfico, Universidade de São Paulo, Praça do Oceanográfico 191, 05508–090, São Paulo, Brazil
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Jairo F. Savian
Jairo F. Savian
Departamento de Geologia, Instituto de Geociências, Universidade Federal do Rio Grande do Sul, 91540–000 Porto Alegre, Brazil
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Mario Sprovieri
Mario Sprovieri
Istituto Ambiente Marino Costiero, Consiglio Nazionale delle Ricerche, 91021 Torretta Granitola, Trapani, Italy
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Published:
July 01, 2016

The Paleocene–early Eocene interval is punctuated by a series of transient warming events known as hyperthermals that have been associated with changes in the carbon isotope composition of the ocean-atmosphere system. Here we present and discuss a detailed record of calcareous nannofossil and foraminiferal assemblages coupled with high-resolution geochemical, isotopic, and environmental magnetic records across the middle Ypresian at the Contessa Road section (Gubbio, Italy). This allows characterization of the Eocene Thermal Maximum 3 (ETM3, K or X) and recognition of four minor (I1, I2, J, L) hyperthermals. At the Contessa Road section, the ETM3 is marked by short-lived negative excursions in both δ13C and δ18O, pronounced changes in rock magnetic properties, and calcium carbonate reduction. These changes coupled with the moderate to low state of preservation of calcareous nannofossils and planktonic foraminifera, higher FI and agglutinated foraminifera values, along with a lower P/(P + B) ratio (P—planktonic; B—benthic) and coarse fractions provide evidence of enhanced carbonate dissolution during the ETM3. A marked shift toward warmer and more oligotrophic conditions has been inferred that suggests unstable and perturbed environmental conditions both in the photic zone and at the seafloor.

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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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