δ¹⁸O and δ¹³C record of Paragloborotalia siakensis and Dentoglobigerina venezuelana from IODP Hole 321-U1337A ...

Knowledge of the equatorial thermocline is essential for understanding climate changes in the tropical Pacific. Multispecies planktic foraminiferal analyses provide a way to examine temperature distributions and thus the structure of the thermocline. Although the secular thermocline development has...

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Bibliographic Details
Main Authors: Matsui, Hiroki, Nishi, Hiroshi, Kuroyanagi, Azumi, Hayashi, Hiroki, Ikehara, Minoru, Takashima, Reishi
Format: Dataset
Language:English
Published: PANGAEA 2020
Subjects:
equatorial Pacific
Miocene
planktic foraminifera
Sample code/label
DEPTH, sediment/rock
Depth, composite revised, adjusted
AGE
Paragloborotalia siakensis, δ13C
Paragloborotalia siakensis, δ18O
Sample comment
Dentoglobigerina venezuelana, δ13C
Dentoglobigerina venezuelana, δ18O
Drilling/drill rig
DSDP/ODP/IODP sample designation
Exp321
Joides Resolution
Integrated Ocean Drilling Program / International Ocean Discovery Program IODP
Antarc*
Antarctic
Ice Sheet
Online Access:https://dx.doi.org/10.1594/pangaea.914391
https://doi.pangaea.de/10.1594/PANGAEA.914391
Description
Summary:Knowledge of the equatorial thermocline is essential for understanding climate changes in the tropical Pacific. Multispecies planktic foraminiferal analyses provide a way to examine temperature distributions and thus the structure of the thermocline. Although the secular thermocline development has been documented back to the late Miocene, the early to middle Miocene interval has rarely been examined. In addition, relationships with the dynamic Antarctic ice sheets remain unclear. Here we investigate the vertical thermal gradient in the upper water column at Integrated Ocean Drilling Program Site U1337 in the eastern equatorial Pacific (EEP) throughout the early to middle Miocene (23.1 to 11.7 Ma). The gradient increased over the Miocene Climatic Optimum, whereas it decreased during the East Antarctic Ice Sheet Expansion (EAIE). Comparison of the EEP record with its western equatorial Pacific (WEP) counterpart suggests that sea surface temperature was more stable in the WEP than in the EEP. We further ... : (1) = Analytical precisions are ±0.10‰ for δ¹⁸O and ±0.04‰ for δ¹³C, whereas blank indicates those are ±0.05‰ forδ¹⁸O and ±0.03‰ for δ¹³C. ...

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