Oxygen isotope record of Globorotalia tumida and Globigerinoides sacculifer in sediments at ODP Site 130-806

Planktonic foraminiferal oxygen isotope records from the western and eastern tropical Pacific and Atlantic Oceans suggest a southward shift in the Intertropical Convergence Zone toward its modern location between 4.4 and 4.3 Ma. A concomitant shift in the carbon isotope compositions of Atlantic bent...

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Bibliographic Details
Main Authors: Billups, Katharina, Ravelo, Ana Christina, Zachos, James C, Norris, Richard D
Format: Dataset
Language:English
Published: PANGAEA 1999
Subjects:
130-806
AGE
COMPCORE
Composite Core
Globigerinoides sacculifer
δ18O
Globorotalia tumida
Joides Resolution
Leg130
North Pacific Ocean
Ocean Drilling Program
ODP
Δδ18O
Pacific
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.712955
https://doi.org/10.1594/PANGAEA.712955
Description
Summary:Planktonic foraminiferal oxygen isotope records from the western and eastern tropical Pacific and Atlantic Oceans suggest a southward shift in the Intertropical Convergence Zone toward its modern location between 4.4 and 4.3 Ma. A concomitant shift in the carbon isotope compositions of Atlantic benthic foraminifera provides strong evidence for an increased thermohaline overturn at this time. We suggest that the southward shift of the Intertropical Convergence Zone and associated change in trade-wind circulation altered equatorial surface hydrography, increased the advection of warmer and more saline surface waters into the subtropical and North Atlantic, and contributed to thermohaline overturn.

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