Stable carbon and oxygen isotope ratios of Globigerinoides sacculifer of ODP Hole 165-999A

Comparison between planktic foraminiferal oxygen isotope records from the Caribbean Sea (Ocean Drilling Program [ODP] Site 999) and the equatorial east Pacific (ODP Site 851) suggests an increase in Caribbean surface-water salinity between 4.7 and 4.2 Ma. The modern Atlantic-Pacific salinity contras...

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Bibliographic Details
Main Authors: Haug, Gerald H, Tiedemann, Ralf, Zahn, Rainer, Ravelo, Ana Christina
Format: Dataset
Language:English
Published: PANGAEA 2001
Subjects:
165-999A
AGE
Caribbean Sea
DEPTH
sediment/rock
sediment revised
DRILL
Drilling/drill rig
DSDP/ODP/IODP sample designation
Globigerinoides sacculifer
δ13C
δ18O
Joides Resolution
Leg165
Ocean Drilling Program
ODP
Sample code/label
Pacific
North Atlantic
North atlantic Thermohaline circulation
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.789867
https://doi.org/10.1594/PANGAEA.789867
Description
Summary:Comparison between planktic foraminiferal oxygen isotope records from the Caribbean Sea (Ocean Drilling Program [ODP] Site 999) and the equatorial east Pacific (ODP Site 851) suggests an increase in Caribbean surface-water salinity between 4.7 and 4.2 Ma. The modern Atlantic-Pacific salinity contrast of about 1 per mil became fully established at 4.2 Ma as reflected by a 0.5 per mil planktic foraminifera 18O enrichment in the Caribbean Sea. This is interpreted as the result of restricted surface-water exchange between the tropical Atlantic and Pacific in response to the shoaling of the Central American seaway. As a consequence, the Atlantic and Pacific surface-ocean circulation regime changed, as did the freshwater balance between the major ocean basins. Simultaneous shifts in benthic carbon isotope records in the Caribbean Sea suggest an intensification in North Atlantic thermohaline circulation. These results indicate that the Panamanian isthmus formation caused several new ocean-atmosphere feedback mechanisms that have affected climate since the early Pliocene.

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