Antarctic glacio-eustatic contributions to late Miocene Mediterranean desiccation and reflooding
The Messinian Salinity Crisis (MSC) was a marked late Neogene oceanographic event during which the Mediterranean Sea evaporated. Its causes remain unresolved, with tectonic restrictions to the Atlantic Ocean or glacio-eustatic restriction of flow during sea-level lowstands, or a mixture of the two m...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/98671 2024-01-14T10:01:38+01:00 Antarctic glacio-eustatic contributions to late Miocene Mediterranean desiccation and reflooding Ohneiser, Christian Florindo, Fabio Stocchi, Paolo Roberts, Andrew deConto, R Pollard, David http://hdl.handle.net/1885/98671 https://doi.org/10.1038/ncomms9765 https://openresearch-repository.anu.edu.au/bitstream/1885/98671/5/01_Ohneiser_Antarctic_glacio-eustatic_2015.pdf.jpg unknown Macmillan Publishers Ltd 2041-1723 http://hdl.handle.net/1885/98671 doi:10.1038/ncomms9765 https://openresearch-repository.anu.edu.au/bitstream/1885/98671/5/01_Ohneiser_Antarctic_glacio-eustatic_2015.pdf.jpg Author/s retain copyright Nature Communications Journal article ftanucanberra https://doi.org/10.1038/ncomms9765 2023-12-15T09:37:08Z The Messinian Salinity Crisis (MSC) was a marked late Neogene oceanographic event during which the Mediterranean Sea evaporated. Its causes remain unresolved, with tectonic restrictions to the Atlantic Ocean or glacio-eustatic restriction of flow during sea-level lowstands, or a mixture of the two mechanisms, being proposed. Here we present the first direct geological evidence of Antarctic ice-sheet (AIS) expansion at the MSC onset and use a δ18 O record to model relative sea-level changes. Antarctic sedimentary successions indicate AIS expansion at 6 Ma coincident with major MSC desiccation; relative sea-level modelling indicates a prolonged ∼50 m lowstand at the Strait of Gibraltar, which resulted from AIS expansion and local evaporation of sea water in concert with evaporite precipitation that caused lithospheric deformation. Our results reconcile MSC events and demonstrate that desiccation and refilling were timed by the interplay between glacio-eustatic sea-level variations, glacial isostatic adjustment and mantle deformation in response to changing water and evaporite loads. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Australian National University: ANU Digital Collections Antarctic Nature Communications 6 1 |
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Australian National University: ANU Digital Collections |
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The Messinian Salinity Crisis (MSC) was a marked late Neogene oceanographic event during which the Mediterranean Sea evaporated. Its causes remain unresolved, with tectonic restrictions to the Atlantic Ocean or glacio-eustatic restriction of flow during sea-level lowstands, or a mixture of the two mechanisms, being proposed. Here we present the first direct geological evidence of Antarctic ice-sheet (AIS) expansion at the MSC onset and use a δ18 O record to model relative sea-level changes. Antarctic sedimentary successions indicate AIS expansion at 6 Ma coincident with major MSC desiccation; relative sea-level modelling indicates a prolonged ∼50 m lowstand at the Strait of Gibraltar, which resulted from AIS expansion and local evaporation of sea water in concert with evaporite precipitation that caused lithospheric deformation. Our results reconcile MSC events and demonstrate that desiccation and refilling were timed by the interplay between glacio-eustatic sea-level variations, glacial isostatic adjustment and mantle deformation in response to changing water and evaporite loads. |
format |
Article in Journal/Newspaper |
author |
Ohneiser, Christian Florindo, Fabio Stocchi, Paolo Roberts, Andrew deConto, R Pollard, David |
spellingShingle |
Ohneiser, Christian Florindo, Fabio Stocchi, Paolo Roberts, Andrew deConto, R Pollard, David Antarctic glacio-eustatic contributions to late Miocene Mediterranean desiccation and reflooding |
author_facet |
Ohneiser, Christian Florindo, Fabio Stocchi, Paolo Roberts, Andrew deConto, R Pollard, David |
author_sort |
Ohneiser, Christian |
title |
Antarctic glacio-eustatic contributions to late Miocene Mediterranean desiccation and reflooding |
title_short |
Antarctic glacio-eustatic contributions to late Miocene Mediterranean desiccation and reflooding |
title_full |
Antarctic glacio-eustatic contributions to late Miocene Mediterranean desiccation and reflooding |
title_fullStr |
Antarctic glacio-eustatic contributions to late Miocene Mediterranean desiccation and reflooding |
title_full_unstemmed |
Antarctic glacio-eustatic contributions to late Miocene Mediterranean desiccation and reflooding |
title_sort |
antarctic glacio-eustatic contributions to late miocene mediterranean desiccation and reflooding |
publisher |
Macmillan Publishers Ltd |
url |
http://hdl.handle.net/1885/98671 https://doi.org/10.1038/ncomms9765 https://openresearch-repository.anu.edu.au/bitstream/1885/98671/5/01_Ohneiser_Antarctic_glacio-eustatic_2015.pdf.jpg |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Nature Communications |
op_relation |
2041-1723 http://hdl.handle.net/1885/98671 doi:10.1038/ncomms9765 https://openresearch-repository.anu.edu.au/bitstream/1885/98671/5/01_Ohneiser_Antarctic_glacio-eustatic_2015.pdf.jpg |
op_rights |
Author/s retain copyright |
op_doi |
https://doi.org/10.1038/ncomms9765 |
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Nature Communications |
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6 |
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1 |
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1788067388099395584 |