A Cenozoic-style scenario for the end-Ordovician glaciation
The end-Ordovician was an enigmatic interval in the Phanerozoic, known for massive glaciation potentially at elevated CO2 levels, biogeochemical cycle disruptions recorded as large isotope anomalies and a devastating extinction event. Ice-sheet volumes claimed to be twice those of the Last Glacial M...
Published in: | Nature Communications |
---|---|
Main Authors: | , , , , , , , , , , |
Other Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2014
|
Subjects: | |
Online Access: | https://hdl.handle.net/11584/54596 https://doi.org/10.1038/ncomms5485 http://www.nature.com/ncomms/2014/140901/ncomms5485/full/ncomms5485.html |
id |
ftunicagliariris:oai:iris.unica.it:11584/54596 |
---|---|
record_format |
openpolar |
spelling |
ftunicagliariris:oai:iris.unica.it:11584/54596 2024-04-21T08:05:02+00:00 A Cenozoic-style scenario for the end-Ordovician glaciation Ghienne, JF Desrochers, A Vandenbroucke, TRA Achab, A Asselin, E Dabard, MP Farley, C LOI, ALFREDO Paris, F Wickson, S Veizer, J. Ghienne, Jf Desrochers, A Vandenbroucke, Tra Achab, A Asselin, E Dabard, Mp Farley, C Loi, Alfredo Paris, F Wickson, S Veizer, J. 2014 https://hdl.handle.net/11584/54596 https://doi.org/10.1038/ncomms5485 http://www.nature.com/ncomms/2014/140901/ncomms5485/full/ncomms5485.html eng eng info:eu-repo/semantics/altIdentifier/pmid/25174941 info:eu-repo/semantics/altIdentifier/wos/WOS:000342774000001 volume:5 numberofpages:22 journal:NATURE COMMUNICATIONS https://hdl.handle.net/11584/54596 doi:10.1038/ncomms5485 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84904908399 http://www.nature.com/ncomms/2014/140901/ncomms5485/full/ncomms5485.html info:eu-repo/semantics/openAccess SEA-LEVEL CHANGE EARLY SILURIAN GLACIATION MASS EXTINCTION ANTI-ATLAS ENVIRONMENTAL-CHANGES ISOTOPIC EVIDENCE ANTICOSTI ISLAND HIGH-RESOLUTION CLIMATE-CHANGE MOROCCO info:eu-repo/semantics/article 2014 ftunicagliariris https://doi.org/10.1038/ncomms5485 2024-03-25T16:17:28Z The end-Ordovician was an enigmatic interval in the Phanerozoic, known for massive glaciation potentially at elevated CO2 levels, biogeochemical cycle disruptions recorded as large isotope anomalies and a devastating extinction event. Ice-sheet volumes claimed to be twice those of the Last Glacial Maximum paradoxically coincided with oceans as warm as today. Here we argue that some of these remarkable claims arise from undersampling of incomplete geological sections that led to apparent temporal correlations within the relatively coarse resolution capability of Palaeozoic biochronostratigraphy. We examine exceptionally complete sedimentary records from two, low and high, palaeolatitude settings. Their correlation framework reveals a Cenozoic-style scenario including three main glacial cycles and higher-order phenomena. This necessitates revision of mechanisms for the end-Ordovician events, as the first extinction is tied to an early phase of melting, not to initial cooling, and the largest δ13C excursion occurs during final deglaciation, not at the glacial apex. Article in Journal/Newspaper Ice Sheet Università degli Studi di Cagliari: UNICA IRIS Nature Communications 5 1 |
institution |
Open Polar |
collection |
Università degli Studi di Cagliari: UNICA IRIS |
op_collection_id |
ftunicagliariris |
language |
English |
topic |
SEA-LEVEL CHANGE EARLY SILURIAN GLACIATION MASS EXTINCTION ANTI-ATLAS ENVIRONMENTAL-CHANGES ISOTOPIC EVIDENCE ANTICOSTI ISLAND HIGH-RESOLUTION CLIMATE-CHANGE MOROCCO |
spellingShingle |
SEA-LEVEL CHANGE EARLY SILURIAN GLACIATION MASS EXTINCTION ANTI-ATLAS ENVIRONMENTAL-CHANGES ISOTOPIC EVIDENCE ANTICOSTI ISLAND HIGH-RESOLUTION CLIMATE-CHANGE MOROCCO Ghienne, JF Desrochers, A Vandenbroucke, TRA Achab, A Asselin, E Dabard, MP Farley, C LOI, ALFREDO Paris, F Wickson, S Veizer, J. A Cenozoic-style scenario for the end-Ordovician glaciation |
topic_facet |
SEA-LEVEL CHANGE EARLY SILURIAN GLACIATION MASS EXTINCTION ANTI-ATLAS ENVIRONMENTAL-CHANGES ISOTOPIC EVIDENCE ANTICOSTI ISLAND HIGH-RESOLUTION CLIMATE-CHANGE MOROCCO |
description |
The end-Ordovician was an enigmatic interval in the Phanerozoic, known for massive glaciation potentially at elevated CO2 levels, biogeochemical cycle disruptions recorded as large isotope anomalies and a devastating extinction event. Ice-sheet volumes claimed to be twice those of the Last Glacial Maximum paradoxically coincided with oceans as warm as today. Here we argue that some of these remarkable claims arise from undersampling of incomplete geological sections that led to apparent temporal correlations within the relatively coarse resolution capability of Palaeozoic biochronostratigraphy. We examine exceptionally complete sedimentary records from two, low and high, palaeolatitude settings. Their correlation framework reveals a Cenozoic-style scenario including three main glacial cycles and higher-order phenomena. This necessitates revision of mechanisms for the end-Ordovician events, as the first extinction is tied to an early phase of melting, not to initial cooling, and the largest δ13C excursion occurs during final deglaciation, not at the glacial apex. |
author2 |
Ghienne, Jf Desrochers, A Vandenbroucke, Tra Achab, A Asselin, E Dabard, Mp Farley, C Loi, Alfredo Paris, F Wickson, S Veizer, J. |
format |
Article in Journal/Newspaper |
author |
Ghienne, JF Desrochers, A Vandenbroucke, TRA Achab, A Asselin, E Dabard, MP Farley, C LOI, ALFREDO Paris, F Wickson, S Veizer, J. |
author_facet |
Ghienne, JF Desrochers, A Vandenbroucke, TRA Achab, A Asselin, E Dabard, MP Farley, C LOI, ALFREDO Paris, F Wickson, S Veizer, J. |
author_sort |
Ghienne, JF |
title |
A Cenozoic-style scenario for the end-Ordovician glaciation |
title_short |
A Cenozoic-style scenario for the end-Ordovician glaciation |
title_full |
A Cenozoic-style scenario for the end-Ordovician glaciation |
title_fullStr |
A Cenozoic-style scenario for the end-Ordovician glaciation |
title_full_unstemmed |
A Cenozoic-style scenario for the end-Ordovician glaciation |
title_sort |
cenozoic-style scenario for the end-ordovician glaciation |
publishDate |
2014 |
url |
https://hdl.handle.net/11584/54596 https://doi.org/10.1038/ncomms5485 http://www.nature.com/ncomms/2014/140901/ncomms5485/full/ncomms5485.html |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
info:eu-repo/semantics/altIdentifier/pmid/25174941 info:eu-repo/semantics/altIdentifier/wos/WOS:000342774000001 volume:5 numberofpages:22 journal:NATURE COMMUNICATIONS https://hdl.handle.net/11584/54596 doi:10.1038/ncomms5485 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84904908399 http://www.nature.com/ncomms/2014/140901/ncomms5485/full/ncomms5485.html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/ncomms5485 |
container_title |
Nature Communications |
container_volume |
5 |
container_issue |
1 |
_version_ |
1796944582677626880 |