Via, Rachael K; Thomas, Deborah J (2006): Nd isotope data for ODP Leg 208 holes [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.724682, Supplement to: Via, RK; Thomas, DJ (2006): Evolution of Atlantic thermohaline circulation: Early Oligocene onset of deep-water production in the North Atlantic. Geology 2006, 34(6), 441-444, https://doi.org/10.1130/G22545.1
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Abstract:
The flow of deep-water masses is a key component of heat transport in the modern climate system, yet the role of deep-ocean heat transport during periods of extreme warmth is poorly understood. The present mode of meridional overturning circulation is characterized by deep-water formation in both the North Atlantic and the Southern Ocean. However, a different mode of meridional overturning circulation operated during the extreme greenhouse warmth of the early Cenozoic, during which time the Southern Ocean was the dominant region of deep-water formation. The combination of general global cooling and tectonic evolution of the Atlantic basins over the past ~55 m.y. ultimately led to the development of a mode of overturning circulation characterized by both Southern Ocean and North Atlantic deep-water sources. The change in deep-water circulation mode may, in turn, have affected global climate; however, unraveling the causes and consequences of this transition requires a better understanding of the timing of the transition. New Nd isotope data from the southeastern Atlantic Ocean indicate that the initial transition to a bipolar mode of deep-water circulation occurred in the early Oligocene, ca. 33 Ma. The likely cause of significant deep-water production in the North Atlantic was tectonic deepening of the sill separating the Greenland-Norwegian Sea from the North Atlantic.
Other version:
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -28.083837 * Median Longitude: 2.400663 * South-bound Latitude: -28.532830 * West-bound Longitude: 1.577000 * North-bound Latitude: -27.186000 * East-bound Longitude: 2.845510
Date/Time Start: 2003-03-24T13:00:00 * Date/Time End: 2003-04-06T21:55:00
Event(s):
208-1262A * Latitude: -27.186000 * Longitude: 1.577000 * Date/Time Start: 2003-03-24T13:00:00 * Date/Time End: 2003-03-26T12:40:00 * Elevation: -4759.0 m * Penetration: 161.5 m * Recovery: 163.53 m * Location: Walvis Ridge, Southeast Atlantic Ocean * Campaign: Leg208 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 161.5 m cored; 0 m drilled; 101.3 % recovery
208-1263A * Latitude: -28.532830 * Longitude: 2.779480 * Date/Time Start: 2003-03-29T15:15:00 * Date/Time End: 2003-04-02T01:25:00 * Elevation: -2717.1 m * Penetration: 345.6 m * Recovery: 295.78 m * Location: Walvis Ridge, Southeast Atlantic Ocean * Campaign: Leg208 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 40 cores; 345.6 m cored; 0 m drilled; 85.6 % recovery
208-1264A * Latitude: -28.532680 * Longitude: 2.845510 * Date/Time Start: 2003-04-05T13:10:00 * Date/Time End: 2003-04-06T21:55:00 * Elevation: -2507.0 m * Penetration: 280.7 m * Recovery: 270.71 m * Location: Walvis Ridge, Southeast Atlantic Ocean * Campaign: Leg208 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 30 cores; 280.7 m cored; 0 m drilled; 96.4 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
Download Data
Datasets listed in this publication series
- Via, RK; Thomas, DJ (2006): (Table DR1) Nd isotope data for ODP Hole 208-1262A. https://doi.org/10.1594/PANGAEA.724679
- Via, RK; Thomas, DJ (2006): (Table DR1) Nd isotope data for ODP Hole 208-1263A. https://doi.org/10.1594/PANGAEA.724680
- Via, RK; Thomas, DJ (2006): (Table DR1) Nd isotope data for ODP Hole 208-1264A. https://doi.org/10.1594/PANGAEA.724681