Formation of “Southern Component Water” in the Late Cretaceous:Evidence from Nd-isotopes
Constraining deep-ocean circulation during past greenhouse climatic periods, such as the Cretaceous, is important for understanding meridional heat transfer processes, controls on ocean anoxia, and the relative roles of climate and tectonics in determining paleocirculation patterns. Ocean circulatio...
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ftsouthampton:oai:eprints.soton.ac.uk:337337 2023-07-30T04:07:01+02:00 Formation of “Southern Component Water” in the Late Cretaceous:Evidence from Nd-isotopes Robinson, Stuart A. Murphy, Daniel P. Vance, Derek Thomas, Deborah J. 2010-10 https://eprints.soton.ac.uk/337337/ unknown Robinson, Stuart A., Murphy, Daniel P., Vance, Derek and Thomas, Deborah J. (2010) Formation of “Southern Component Water” in the Late Cretaceous:Evidence from Nd-isotopes. Geology, 38 (10), 871-874. (doi:10.1130/G31165.1 <http://dx.doi.org/10.1130/G31165.1>). Article PeerReviewed 2010 ftsouthampton https://doi.org/10.1130/G31165.1 2023-07-09T21:38:28Z Constraining deep-ocean circulation during past greenhouse climatic periods, such as the Cretaceous, is important for understanding meridional heat transfer processes, controls on ocean anoxia, and the relative roles of climate and tectonics in determining paleocirculation patterns. Ocean circulation models for the Late Cretaceous and early Paleogene suggest that significant deep-water production occurred in the Southern Ocean, but cannot constrain when this process commenced or what the temporal relationship was between opening tectonic gateways and Late Cretaceous climatic cooling. Nd-isotope data obtained from biogenic apatite (fish teeth and bones) are presented from lower bathyal and abyssal sites in the South Atlantic and Indian Oceans. During the mid-Cretaceous, relatively radiogenic Nd-isotope values suggest that deep-water circulation in these basins was sluggish with inputs likely dominated by seawater-particle exchange processes and, possibly, easily weathered volcanic terranes. In the Campanian–Maastrichtian the Nd-isotopic composition of proto-Indian and South Atlantic deep waters became less radiogenic, suggesting the onset of deep-water formation in the Southern Ocean (Southern Component Water, SCW), consistent with Paleogene reconstructions and ocean circulation models. A combination of Southern Hemisphere cooling and the opening of tectonic gateways during the Campanian likely drove the onset of SCW. Article in Journal/Newspaper Southern Ocean University of Southampton: e-Prints Soton Southern Ocean Indian Geology 38 10 871 874 |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
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Constraining deep-ocean circulation during past greenhouse climatic periods, such as the Cretaceous, is important for understanding meridional heat transfer processes, controls on ocean anoxia, and the relative roles of climate and tectonics in determining paleocirculation patterns. Ocean circulation models for the Late Cretaceous and early Paleogene suggest that significant deep-water production occurred in the Southern Ocean, but cannot constrain when this process commenced or what the temporal relationship was between opening tectonic gateways and Late Cretaceous climatic cooling. Nd-isotope data obtained from biogenic apatite (fish teeth and bones) are presented from lower bathyal and abyssal sites in the South Atlantic and Indian Oceans. During the mid-Cretaceous, relatively radiogenic Nd-isotope values suggest that deep-water circulation in these basins was sluggish with inputs likely dominated by seawater-particle exchange processes and, possibly, easily weathered volcanic terranes. In the Campanian–Maastrichtian the Nd-isotopic composition of proto-Indian and South Atlantic deep waters became less radiogenic, suggesting the onset of deep-water formation in the Southern Ocean (Southern Component Water, SCW), consistent with Paleogene reconstructions and ocean circulation models. A combination of Southern Hemisphere cooling and the opening of tectonic gateways during the Campanian likely drove the onset of SCW. |
format |
Article in Journal/Newspaper |
author |
Robinson, Stuart A. Murphy, Daniel P. Vance, Derek Thomas, Deborah J. |
spellingShingle |
Robinson, Stuart A. Murphy, Daniel P. Vance, Derek Thomas, Deborah J. Formation of “Southern Component Water” in the Late Cretaceous:Evidence from Nd-isotopes |
author_facet |
Robinson, Stuart A. Murphy, Daniel P. Vance, Derek Thomas, Deborah J. |
author_sort |
Robinson, Stuart A. |
title |
Formation of “Southern Component Water” in the Late Cretaceous:Evidence from Nd-isotopes |
title_short |
Formation of “Southern Component Water” in the Late Cretaceous:Evidence from Nd-isotopes |
title_full |
Formation of “Southern Component Water” in the Late Cretaceous:Evidence from Nd-isotopes |
title_fullStr |
Formation of “Southern Component Water” in the Late Cretaceous:Evidence from Nd-isotopes |
title_full_unstemmed |
Formation of “Southern Component Water” in the Late Cretaceous:Evidence from Nd-isotopes |
title_sort |
formation of “southern component water” in the late cretaceous:evidence from nd-isotopes |
publishDate |
2010 |
url |
https://eprints.soton.ac.uk/337337/ |
geographic |
Southern Ocean Indian |
geographic_facet |
Southern Ocean Indian |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Robinson, Stuart A., Murphy, Daniel P., Vance, Derek and Thomas, Deborah J. (2010) Formation of “Southern Component Water” in the Late Cretaceous:Evidence from Nd-isotopes. Geology, 38 (10), 871-874. (doi:10.1130/G31165.1 <http://dx.doi.org/10.1130/G31165.1>). |
op_doi |
https://doi.org/10.1130/G31165.1 |
container_title |
Geology |
container_volume |
38 |
container_issue |
10 |
container_start_page |
871 |
op_container_end_page |
874 |
_version_ |
1772820079177629696 |