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The Rotalipora cushmani extinction at Gubbio (Italy); planktonic foraminiferal testimonial of the onset of the Caribbean large igneous province emplacement?

Rodolfo Coccioni, Marianna Sideri, Fabrizio Frontalini and Alessandro Montanari
The Rotalipora cushmani extinction at Gubbio (Italy); planktonic foraminiferal testimonial of the onset of the Caribbean large igneous province emplacement? (in The stratigraphic record of Gubbio; integrated stratigraphy of the Late Cretaceous-Paleogene Umbria-Marche pelagic basin, Marco Menichetti (editor), Rodolfo Coccioni (editor) and Alessandro Montanari (editor))
Special Paper - Geological Society of America (2016) 524: 79-96

Abstract

The highest stages of the stratigraphic range of the planktonic foraminiferal Rotalipora cushmani were investigated in a 313-k.y.-long interval of the classical Tethyan Bottaccione section (Gubbio, Italy), the type locality of the C (sub org-) rich Bonarelli Level, which is the sedimentary expression of the worldwide latest Cenomanian oceanic anoxic event 2 (OAE 2).The disappearance of R. cushmani is associated with the major turnover of marine microfauna and microflora that involves both planktonic and benthic foraminifera, and calcareous nannofossils, slightly before the onset of OAE 2, which, according to current available data, was triggered by a massive pulse of submarine mafic volcanism accompanying the initial emplacement of the Caribbean large igneous province (CLIP). This pulse of volcanic activity probably turned the climate in a strengthened greenhouse mode, accelerating continental weathering and increasing nutrient supply in oceanic surface waters via river runoff and triggering higher fertility in the global ocean. Our investigation shows that the marine biotic turnover started approximately 55 k.y. before the onset of OAE 2 and is closely coeval with the first major episode, as recorded by the unradiogenic trend in (super 187) Os/ (super 188) Os, of the ongoing magmatic activity of the CLIP, which produced increasing pCO (sub 2) , ocean dissolution and/or acidification with a severe carbonate crisis and fertilization through enormous quantities of biolimiting metals. The marine microfauna and microflora reacted rapidly to new conditions of higher pCO (sub 2) and fertility by undergoing marked changes following three main steps. We evaluate this pattern and postulate that the first pulse of volcanogenic CO (sub 2) from the CLIP emplacement (ca. 94.2 or 94.6 Ma) played a fundamental role in the marine biotic turnover recorded shortly before the onset of OAE 2 and notably in the local or regional disappearance of R. cushmani in the central-western Tethys.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 524
Title: The Rotalipora cushmani extinction at Gubbio (Italy); planktonic foraminiferal testimonial of the onset of the Caribbean large igneous province emplacement?
Title: The stratigraphic record of Gubbio; integrated stratigraphy of the Late Cretaceous-Paleogene Umbria-Marche pelagic basin
Author(s): Coccioni, RodolfoSideri, MariannaFrontalini, FabrizioMontanari, Alessandro
Author(s): Menichetti, Marcoeditor
Author(s): Coccioni, Rodolfoeditor
Author(s): Montanari, Alessandroeditor
Affiliation: Universita degli Studi di Urbino "Carlo Bo", Dipartimento di Scienze Pure e Applicate, Urbino, Italy
Pages: 79-96
Published: 2016
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 178
Accession Number: 2016-094091
Categories: Invertebrate paleontologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map, 1 plate, 1 table, strat. col.
N43°21'56" - N43°21'56", E12°34'57" - E12°34'57"
Secondary Affiliation: Osservatorio Geologico di Coldigioco, ITA, Italy
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201646
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