High-resolution geochemical and biotic records of the Tethyan ‘Bonarelli Level’ (OAE2, latest Cenomanian) from the Calabianca-Guidaloca composite section, northwestern Sicily, Italy
High-resolution micropalaeontological and chemostratigraphic records for the upper Cenomanian portion of theCalabianca–Guidaloca composite section (NW Sicily) provide new insight into the palaeoclimatic and palaeoceanographic evolution of the Tethys Ocean. The Bonarelli Level equivalent was identifi...
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ftunivferrarair:oai:iris.unife.it:11392/1204337 2024-02-11T10:08:03+01:00 High-resolution geochemical and biotic records of the Tethyan ‘Bonarelli Level’ (OAE2, latest Cenomanian) from the Calabianca-Guidaloca composite section, northwestern Sicily, Italy SCOPELLITI G BELLANCA A NERI R COCCIONI R BAUDIN F. LUCIANI, Valeria Scopelliti, G Bellanca, A Neri, R Coccioni, R Luciani, Valeria Baudin, F. 2004 STAMPA http://hdl.handle.net/11392/1204337 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000222192400008 volume:208 firstpage:293 lastpage:317 journal:PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY http://hdl.handle.net/11392/1204337 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-2642538579 Cretaceous Oceanic Anoxic Event Sicily Corg-rich deposit Bonarelli level equivalent Planktonic foraminifera radiolarian Geochemical proxie Palaeoceanography info:eu-repo/semantics/article 2004 ftunivferrarair 2024-01-24T17:34:33Z High-resolution micropalaeontological and chemostratigraphic records for the upper Cenomanian portion of theCalabianca–Guidaloca composite section (NW Sicily) provide new insight into the palaeoclimatic and palaeoceanographic evolution of the Tethys Ocean. The Bonarelli Level equivalent was identified on the basis of lithology and well constrained by calcareous plankton biostratigraphy and radiolarian assemblages, as well as by the d13C curve showing a marked positive excursion (up to 4.7x). The Bonarelli Level equivalent deposition is characterized by highly eutrophic conditions as testified by radiolarian proliferation. Black shale samples from the Calabianca–Guidaloca composite section contain very high TOC (up to 26%) and moderate to high amounts of CaCO3 (on average 20%). Among the planktonic foraminifera, hedbergellids and globigerinelloids tolerated the environmental stress induced by the Oceanic Anoxic Event 2 (OAE2). The occurrence of some benthic foraminifera testifies to dysoxic rather than completely anoxic conditions at the sea floor during the deposition of some portions of the Bonarelli Level equivalent. Based on micropalaeontological results and geochemical proxies (d13C, D*, Rb, Ti, V, Ni, Ba, Si, Cr), the Bonarelli Level equivalent is interpreted as a highproductivity event driven by increasingly warm and humid climatic conditions promoting an accelerated hydrological cycle. We propose that periodically increased riverine influxes, triggered by enhanced humidity, resulted in a sluggish circulation mode and consequent anoxic/euxinic conditions favouring the preservation of organic matter at the sea-floor. Spectral analyses performed on selected geochemical signals reveal within the main high productivity event a strong orbital–climatic forcing represented by a long-term eccentricity-steered humidity cyclicity that amplifies a short-term precessioncontrolled productivity fluctuation. Article in Journal/Newspaper Planktonic foraminifera Università degli Studi di Ferrara: CINECA IRIS |
institution |
Open Polar |
collection |
Università degli Studi di Ferrara: CINECA IRIS |
op_collection_id |
ftunivferrarair |
language |
English |
topic |
Cretaceous Oceanic Anoxic Event Sicily Corg-rich deposit Bonarelli level equivalent Planktonic foraminifera radiolarian Geochemical proxie Palaeoceanography |
spellingShingle |
Cretaceous Oceanic Anoxic Event Sicily Corg-rich deposit Bonarelli level equivalent Planktonic foraminifera radiolarian Geochemical proxie Palaeoceanography SCOPELLITI G BELLANCA A NERI R COCCIONI R BAUDIN F. LUCIANI, Valeria High-resolution geochemical and biotic records of the Tethyan ‘Bonarelli Level’ (OAE2, latest Cenomanian) from the Calabianca-Guidaloca composite section, northwestern Sicily, Italy |
topic_facet |
Cretaceous Oceanic Anoxic Event Sicily Corg-rich deposit Bonarelli level equivalent Planktonic foraminifera radiolarian Geochemical proxie Palaeoceanography |
description |
High-resolution micropalaeontological and chemostratigraphic records for the upper Cenomanian portion of theCalabianca–Guidaloca composite section (NW Sicily) provide new insight into the palaeoclimatic and palaeoceanographic evolution of the Tethys Ocean. The Bonarelli Level equivalent was identified on the basis of lithology and well constrained by calcareous plankton biostratigraphy and radiolarian assemblages, as well as by the d13C curve showing a marked positive excursion (up to 4.7x). The Bonarelli Level equivalent deposition is characterized by highly eutrophic conditions as testified by radiolarian proliferation. Black shale samples from the Calabianca–Guidaloca composite section contain very high TOC (up to 26%) and moderate to high amounts of CaCO3 (on average 20%). Among the planktonic foraminifera, hedbergellids and globigerinelloids tolerated the environmental stress induced by the Oceanic Anoxic Event 2 (OAE2). The occurrence of some benthic foraminifera testifies to dysoxic rather than completely anoxic conditions at the sea floor during the deposition of some portions of the Bonarelli Level equivalent. Based on micropalaeontological results and geochemical proxies (d13C, D*, Rb, Ti, V, Ni, Ba, Si, Cr), the Bonarelli Level equivalent is interpreted as a highproductivity event driven by increasingly warm and humid climatic conditions promoting an accelerated hydrological cycle. We propose that periodically increased riverine influxes, triggered by enhanced humidity, resulted in a sluggish circulation mode and consequent anoxic/euxinic conditions favouring the preservation of organic matter at the sea-floor. Spectral analyses performed on selected geochemical signals reveal within the main high productivity event a strong orbital–climatic forcing represented by a long-term eccentricity-steered humidity cyclicity that amplifies a short-term precessioncontrolled productivity fluctuation. |
author2 |
Scopelliti, G Bellanca, A Neri, R Coccioni, R Luciani, Valeria Baudin, F. |
format |
Article in Journal/Newspaper |
author |
SCOPELLITI G BELLANCA A NERI R COCCIONI R BAUDIN F. LUCIANI, Valeria |
author_facet |
SCOPELLITI G BELLANCA A NERI R COCCIONI R BAUDIN F. LUCIANI, Valeria |
author_sort |
SCOPELLITI G |
title |
High-resolution geochemical and biotic records of the Tethyan ‘Bonarelli Level’ (OAE2, latest Cenomanian) from the Calabianca-Guidaloca composite section, northwestern Sicily, Italy |
title_short |
High-resolution geochemical and biotic records of the Tethyan ‘Bonarelli Level’ (OAE2, latest Cenomanian) from the Calabianca-Guidaloca composite section, northwestern Sicily, Italy |
title_full |
High-resolution geochemical and biotic records of the Tethyan ‘Bonarelli Level’ (OAE2, latest Cenomanian) from the Calabianca-Guidaloca composite section, northwestern Sicily, Italy |
title_fullStr |
High-resolution geochemical and biotic records of the Tethyan ‘Bonarelli Level’ (OAE2, latest Cenomanian) from the Calabianca-Guidaloca composite section, northwestern Sicily, Italy |
title_full_unstemmed |
High-resolution geochemical and biotic records of the Tethyan ‘Bonarelli Level’ (OAE2, latest Cenomanian) from the Calabianca-Guidaloca composite section, northwestern Sicily, Italy |
title_sort |
high-resolution geochemical and biotic records of the tethyan ‘bonarelli level’ (oae2, latest cenomanian) from the calabianca-guidaloca composite section, northwestern sicily, italy |
publishDate |
2004 |
url |
http://hdl.handle.net/11392/1204337 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000222192400008 volume:208 firstpage:293 lastpage:317 journal:PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY http://hdl.handle.net/11392/1204337 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-2642538579 |
_version_ |
1790606978227109888 |