Neodymium isotope record of ODP Site 177-1090

Age estimates for the opening of Drake Passage range from 49 to 17 million years ago (Ma), complicating interpretations of the relationship between ocean circulation and global cooling. Secular variations of neodymium isotope ratios at Agulhas Ridge (Southern Ocean, Atlantic sector) suggest an influ...

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Bibliographic Details
Main Authors: Scher, Howie D, Martin, Ellen E
Format: Dataset
Language:English
Published: PANGAEA 2006
Subjects:
177-1090
COMPCORE
Composite Core
Joides Resolution
Leg177
Ocean Drilling Program
ODP
South Atlantic Ocean
Antarctic
Drake Passage
Pacific
Southern Ocean
Antarc*
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.771995
https://doi.org/10.1594/PANGAEA.771995
Description
Summary:Age estimates for the opening of Drake Passage range from 49 to 17 million years ago (Ma), complicating interpretations of the relationship between ocean circulation and global cooling. Secular variations of neodymium isotope ratios at Agulhas Ridge (Southern Ocean, Atlantic sector) suggest an influx of shallow Pacific seawater approximately 41 Ma. The timing of this connection and the subsequent deepening of the passage coincide with increased biological productivity and abrupt climate reversals. Circulation/productivity linkages are proposed as a mechanism for declining atmospheric carbon dioxide. These results also indicate that Drake Passage opened before the Tasmanian Gateway, implying the late Eocene establishment of a complete circum-Antarctic pathway.

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