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 the Calabianca-Guidaloca composite section (NW Sicily) provide new insight into the palaeoclimatic and palaeoceanographic evolution of the Tethys Ocean. The Bonarelli Level equivalent was identif...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | http://hdl.handle.net/10447/32560 https://doi.org/10.1016/j.palaeo.2004.03.012 |
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ftunivpalermo:oai:iris.unipa.it:10447/32560 2024-02-11T10:08:05+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, Giovanna BELLANCA, Adriana COCCIONI R LUCIANI V NERI, Rodolfo BAUDIN F CHIARI M MARCUCCI M. SCOPELLITI G BELLANCA A COCCIONI R LUCIANI V NERI R BAUDIN F CHIARI M MARCUCCI M 2004 http://hdl.handle.net/10447/32560 https://doi.org/10.1016/j.palaeo.2004.03.012 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000222192400008 volume:208 issue:3-4 firstpage:293 lastpage:317 numberofpages:25 journal:PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY http://hdl.handle.net/10447/32560 doi:10.1016/j.palaeo.2004.03.012 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-2642538579 info:eu-repo/semantics/closedAccess Cretaceous Sicily Corg-rich deposits Bonarelli level equivalent Microfossils Geochemical proxies Palaeoceanography info:eu-repo/semantics/article 2004 ftunivpalermo https://doi.org/10.1016/j.palaeo.2004.03.012 2024-01-23T23:22:28Z High-resolution micropalaeontological and chemostratigraphic records for the upper Cenomanian portion of the Calabianca-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 4.7‰). 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 (averagely 20%). Among the planktonic foraminifera, hedbergellids and globigerinelloids tolerated the environmental stress induced by the 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 high-productivity 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 precession-controlled productivity fluctuation. Article in Journal/Newspaper Planktonic foraminifera IRIS Università degli Studi di Palermo Palaeogeography, Palaeoclimatology, Palaeoecology 208 3-4 293 317 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Palermo |
op_collection_id |
ftunivpalermo |
language |
English |
topic |
Cretaceous Sicily Corg-rich deposits Bonarelli level equivalent Microfossils Geochemical proxies Palaeoceanography |
spellingShingle |
Cretaceous Sicily Corg-rich deposits Bonarelli level equivalent Microfossils Geochemical proxies Palaeoceanography SCOPELLITI, Giovanna BELLANCA, Adriana COCCIONI R LUCIANI V NERI, Rodolfo BAUDIN F CHIARI M MARCUCCI M. 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 Sicily Corg-rich deposits Bonarelli level equivalent Microfossils Geochemical proxies Palaeoceanography |
description |
High-resolution micropalaeontological and chemostratigraphic records for the upper Cenomanian portion of the Calabianca-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 4.7‰). 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 (averagely 20%). Among the planktonic foraminifera, hedbergellids and globigerinelloids tolerated the environmental stress induced by the 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 high-productivity 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 precession-controlled productivity fluctuation. |
author2 |
SCOPELLITI G BELLANCA A COCCIONI R LUCIANI V NERI R BAUDIN F CHIARI M MARCUCCI M |
format |
Article in Journal/Newspaper |
author |
SCOPELLITI, Giovanna BELLANCA, Adriana COCCIONI R LUCIANI V NERI, Rodolfo BAUDIN F CHIARI M MARCUCCI M. |
author_facet |
SCOPELLITI, Giovanna BELLANCA, Adriana COCCIONI R LUCIANI V NERI, Rodolfo BAUDIN F CHIARI M MARCUCCI M. |
author_sort |
SCOPELLITI, Giovanna |
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/10447/32560 https://doi.org/10.1016/j.palaeo.2004.03.012 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000222192400008 volume:208 issue:3-4 firstpage:293 lastpage:317 numberofpages:25 journal:PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY http://hdl.handle.net/10447/32560 doi:10.1016/j.palaeo.2004.03.012 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-2642538579 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.palaeo.2004.03.012 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
208 |
container_issue |
3-4 |
container_start_page |
293 |
op_container_end_page |
317 |
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1790607029830680576 |