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Post-Eocene intensification of deep-water circulation in the central South Pacific: Micropaleontological clues from dredged sites along the eastern Manihiki Plateau margin.
Ando, Atsushi, Kuroda, Junichiro, Werner, Reinhard, Hoernle, Kaj and Huber, Brian T. (2019) Post-Eocene intensification of deep-water circulation in the central South Pacific: Micropaleontological clues from dredged sites along the eastern Manihiki Plateau margin. Terra Nova, 31 (1). pp. 28-38. DOI 10.1111/ter.12366.
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Abstract
Reconstruction of early Cenozoic deep‐water circulation is one of the keys to modelling Earth's greenhouse‐to‐icehouse surface evolution, but it has long been hampered by the paucity of information from the central South Pacific. To help overcome this knowledge gap, we present new micropalaeontological data from dredged carbonates (R/V Sonne Expedition SO193) at several eastern volcanic salients of the Manihiki Plateau. Interestingly, despite appreciable longitudinal separations among the dredged sites, ages indicated by the foraminiferal assemblages are consistently around the Middle Eocene [including mixed Turonian (Late Cretaceous)/Eocene at a single site], suggesting widespread post‐Eocene cessation of the pelagic sedimentation. By integrating with independent seismic and chronostratigraphic data (Deep Sea Drilling Project Leg 33) for large‐scale erosion of top‐Eocene–Oligocene sedimentary units on the eastern Manihiki Plateau, our results can be viewed as novel physical evidence for the intensification of central South Pacific deep‐water circulation since the Eocene/Oligocene climatic transition.
Document Type: | Article |
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Keywords: | Manihiki Plateau, planktonic foraminifera, Eocene, South Pacific, deep-water circulation |
Research affiliation: | OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS |
Refereed: | Yes |
Open Access Journal?: | No |
Publisher: | Wiley |
Projects: | MANIHIKI |
Expeditions/Models/Experiments: | |
Date Deposited: | 04 Dec 2018 11:07 |
Last Modified: | 31 Jan 2022 09:20 |
URI: | https://oceanrep.geomar.de/id/eprint/44831 |
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