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Planktic foraminiferal δ¹⁸O and δ¹³C record from IODP Hole 320-U1334A

Understanding planktic foraminiferal depth habitat along with consistent taxonomic concepts is key to accurate reconstruction of paleoceanographic records. The Oligocene‐Pliocene long‐ranging and widely distributed species Dentoglobigerina venezuelana lived in the mixed layer (shallower) during the early Oligocene, whereas the same species calcified at thermocline or subthermocline depths (deeper) during the late Oligocene and Miocene. The exact timing of the species' depth habitat change and its possible relationships with Oligocene climate dynamics remain unknown. Here we reveal isotopic records of D. venezuelana along with the Paragloborotalia siakensis group (a mixed‐layer dweller) by using sediments at Integrated Ocean Drilling Program Site U1334 in the eastern equatorial Pacific throughout the Oligocene. A two‐step depth habitat change of D. venezuelana is apparent: (1) from upper to lower mixed layer (~27.4 Ma) and (2) from lower mixed layer to thermocline depth (~26.3 Ma). In addition, the planktic foraminiferal faunal assemblage experienced a marked change from dominantly thermocline (deeper) species to abundant mixed‐layer (shallower) species, suggesting that depth habitat shifts of D. venezuelana were clearly related to thermocline deepening in the eastern equatorial Pacific. Comparison of the first isotopic shift (~27.4 Ma) at multiple sites (U1334, U1333, and 1218) revealed a southward depth habitat change of D. venezuelana within ~200 kyr, implying overall thermocline deepening with reduced steepness in the eastern equatorial Pacific. We consider that global warming conditions during the late Oligocene likely caused thermocline deepening with upwelling decrease in the eastern equatorial Pacific, guiding D. venezuelana to adapt to greater depths in the water column.

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Cite this as

Matsui, Hiroki, Nishi, Hiroshi, Takashima, Reishi, Kuroyanagi, Azumi, Ikehara, Minoru, Takayanagi, Hideko, Iryu, Yasufumi (2020). Dataset: Planktic foraminiferal δ¹⁸O and δ¹³C record from IODP Hole 320-U1334A. https://doi.org/10.1594/PANGAEA.914376

DOI retrieved: 2020

Additional Info

Field Value
Imported on November 30, 2024
Last update November 30, 2024
License CC-BY-4.0
Source https://doi.org/10.1594/PANGAEA.914376
Author Matsui, Hiroki
Given Name Hiroki
Family Name Matsui
More Authors
Nishi, Hiroshi
Takashima, Reishi
Kuroyanagi, Azumi
Ikehara, Minoru
Takayanagi, Hideko
Iryu, Yasufumi
Source Creation 2020
Publication Year 2020
Resource Type text/tab-separated-values - filename: Matsui-etal_2016_TableS6
Subject Areas
Name: Lithosphere

Name: Oceans

Name: Paleontology

Related Identifiers
Title: Changes in the depth habitat of the Oligocene planktic foraminifera (Dentoglobigerina venezuelana) induced by thermocline deepening in the eastern equatorial Pacific
Identifier: https://doi.org/10.1002/2016PA002950
Type: DOI
Relation: References
Year: 2016
Source: Paleoceanography
Authors: Matsui Hiroki , Nishi Hiroshi , Takashima Reishi , Kuroyanagi Azumi , Ikehara Minoru , Takayanagi Hideko , Iryu Yasufumi , Westerhold Thomas , Röhl Ursula , Wilkens Roy H , Pälike Heiko , Lyle Mitchell W , Dunkley Jones Tom , Bown Paul R , Moore Ted , Kamikuri Shin-Ichi .

Title: Revised composite depth scales and integration of IODP Sites U1331, U1332, U1333, U1334 and ODP Sites 1218, 1219, 1220
Identifier: https://doi.org/10.2204/iodp.proc.320321.201.2012
Type: DOI
Relation: References
Year: 2012
Source: Proc. IODP: Tokyo (Integrated Ocean Drilling Program Management International, Inc.)
Authors: Matsui Hiroki , Nishi Hiroshi , Takashima Reishi , Kuroyanagi Azumi , Ikehara Minoru , Takayanagi Hideko , Iryu Yasufumi , Westerhold Thomas , Röhl Ursula , Wilkens Roy H , Pälike Heiko , Lyle Mitchell W , Dunkley Jones Tom , Bown Paul R , Moore Ted , Kamikuri Shin-Ichi .