Age model and Nd isotope ratios of DSDO Hole 43-386 and ODP Hole 210-1276A
Modern thermohaline circulation plays a role in latitudinal heat transport and in deep-ocean ventilation, yet ocean circulation may have functioned differently during past periods of extreme warmth, such as the Cretaceous. The Late Cretaceous (100-65 Ma) was an important period in the evolution of t...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.817120 2024-09-15T18:21:22+00:00 Age model and Nd isotope ratios of DSDO Hole 43-386 and ODP Hole 210-1276A Robinson, Stuart A Vance, Derek MEDIAN LATITUDE: 38.296065 * MEDIAN LONGITUDE: -54.517415 * SOUTH-BOUND LATITUDE: 31.186800 * WEST-BOUND LONGITUDE: -64.249000 * NORTH-BOUND LATITUDE: 45.405330 * EAST-BOUND LONGITUDE: -44.785830 * DATE/TIME START: 1975-07-24T00:00:00 * DATE/TIME END: 2003-07-16T08:44:00 2012 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.817120 https://doi.org/10.1594/PANGAEA.817120 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.817120 https://doi.org/10.1594/PANGAEA.817120 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Robinson, Stuart A; Vance, Derek (2012): Widespread and synchronous change in deep-ocean circulation in the North and South Atlantic during the Late Cretaceous. Paleoceanography, 27(1), PA1102, https://doi.org/10.1029/2011PA002240 210-1276A DRILL Drilling/drill rig Joides Resolution Leg210 North Atlantic Ocean Ocean Drilling Program ODP dataset publication series 2012 ftpangaea https://doi.org/10.1594/PANGAEA.81712010.1029/2011PA002240 2024-08-21T00:02:25Z Modern thermohaline circulation plays a role in latitudinal heat transport and in deep-ocean ventilation, yet ocean circulation may have functioned differently during past periods of extreme warmth, such as the Cretaceous. The Late Cretaceous (100-65 Ma) was an important period in the evolution of the North Atlantic Ocean, characterized by opening ocean gateways, long-term climatic cooling and the cessation of intermittent periods of anoxia (oceanic anoxic events, OAEs). However, how these phenomena relate to deep-water circulation is unclear. We use a proxy for deep-water mass composition (neodymium isotopes; e-Nd) to show that, at North Atlantic ODP Site 1276, deep waters shifted in the early Campanian (~78-83 Ma) from e-Nd values of ~-7 to values of ~-9, consistent with a change in the style of deep-ocean circulation but >10 Myr after a change in bottom water oxygenation conditions. A similar, but more poorly dated, trend exists in e-Nd data from DSDP Site 386. The Campanian e-Nd transition observed in the North Atlantic records is also seen in the South Atlantic and proto-Indian Ocean, implying a widespread and synchronous change in deep-ocean circulation. Although a unique explanation does not exist for the change at present, we favor an interpretation that invokes Late Cretaceous climatic cooling as a driver for the formation of Southern Component Water, which flowed northward from the Southern Ocean and into the North Atlantic and proto-Indian Oceans. Other/Unknown Material North Atlantic Southern Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-64.249000,-44.785830,45.405330,31.186800) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
210-1276A DRILL Drilling/drill rig Joides Resolution Leg210 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
210-1276A DRILL Drilling/drill rig Joides Resolution Leg210 North Atlantic Ocean Ocean Drilling Program ODP Robinson, Stuart A Vance, Derek Age model and Nd isotope ratios of DSDO Hole 43-386 and ODP Hole 210-1276A |
topic_facet |
210-1276A DRILL Drilling/drill rig Joides Resolution Leg210 North Atlantic Ocean Ocean Drilling Program ODP |
description |
Modern thermohaline circulation plays a role in latitudinal heat transport and in deep-ocean ventilation, yet ocean circulation may have functioned differently during past periods of extreme warmth, such as the Cretaceous. The Late Cretaceous (100-65 Ma) was an important period in the evolution of the North Atlantic Ocean, characterized by opening ocean gateways, long-term climatic cooling and the cessation of intermittent periods of anoxia (oceanic anoxic events, OAEs). However, how these phenomena relate to deep-water circulation is unclear. We use a proxy for deep-water mass composition (neodymium isotopes; e-Nd) to show that, at North Atlantic ODP Site 1276, deep waters shifted in the early Campanian (~78-83 Ma) from e-Nd values of ~-7 to values of ~-9, consistent with a change in the style of deep-ocean circulation but >10 Myr after a change in bottom water oxygenation conditions. A similar, but more poorly dated, trend exists in e-Nd data from DSDP Site 386. The Campanian e-Nd transition observed in the North Atlantic records is also seen in the South Atlantic and proto-Indian Ocean, implying a widespread and synchronous change in deep-ocean circulation. Although a unique explanation does not exist for the change at present, we favor an interpretation that invokes Late Cretaceous climatic cooling as a driver for the formation of Southern Component Water, which flowed northward from the Southern Ocean and into the North Atlantic and proto-Indian Oceans. |
format |
Other/Unknown Material |
author |
Robinson, Stuart A Vance, Derek |
author_facet |
Robinson, Stuart A Vance, Derek |
author_sort |
Robinson, Stuart A |
title |
Age model and Nd isotope ratios of DSDO Hole 43-386 and ODP Hole 210-1276A |
title_short |
Age model and Nd isotope ratios of DSDO Hole 43-386 and ODP Hole 210-1276A |
title_full |
Age model and Nd isotope ratios of DSDO Hole 43-386 and ODP Hole 210-1276A |
title_fullStr |
Age model and Nd isotope ratios of DSDO Hole 43-386 and ODP Hole 210-1276A |
title_full_unstemmed |
Age model and Nd isotope ratios of DSDO Hole 43-386 and ODP Hole 210-1276A |
title_sort |
age model and nd isotope ratios of dsdo hole 43-386 and odp hole 210-1276a |
publisher |
PANGAEA |
publishDate |
2012 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.817120 https://doi.org/10.1594/PANGAEA.817120 |
op_coverage |
MEDIAN LATITUDE: 38.296065 * MEDIAN LONGITUDE: -54.517415 * SOUTH-BOUND LATITUDE: 31.186800 * WEST-BOUND LONGITUDE: -64.249000 * NORTH-BOUND LATITUDE: 45.405330 * EAST-BOUND LONGITUDE: -44.785830 * DATE/TIME START: 1975-07-24T00:00:00 * DATE/TIME END: 2003-07-16T08:44:00 |
long_lat |
ENVELOPE(-64.249000,-44.785830,45.405330,31.186800) |
genre |
North Atlantic Southern Ocean |
genre_facet |
North Atlantic Southern Ocean |
op_source |
Supplement to: Robinson, Stuart A; Vance, Derek (2012): Widespread and synchronous change in deep-ocean circulation in the North and South Atlantic during the Late Cretaceous. Paleoceanography, 27(1), PA1102, https://doi.org/10.1029/2011PA002240 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.817120 https://doi.org/10.1594/PANGAEA.817120 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.81712010.1029/2011PA002240 |
_version_ |
1810459897718898688 |