(Table 2) Mg/Ca and Sr/Ca composition of planktonic foraminifera from ODP Hole 143-865B

To understand the climate dynamics of hypothesized past greenhouse intervals, it is essential to constrain tropical sea-surface temperatures (SST), yet existing proxy records give conflicting results. Here we present the first Mg/Ca-based study of pre-Quaternary SST and investigate early Paleogene (...

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Bibliographic Details
Main Authors: Tripati, Aradhna K, Delaney, Margaret Lois, Zachos, James C, Anderson, Linda Davis, Kelly, Daniel Clay, Elderfield, Henry
Format: Dataset
Language:English
Published: PANGAEA 2003
Subjects:
143-865B
AGE
DEPTH
sediment/rock
DRILL
Drilling/drill rig
DSDP/ODP/IODP sample designation
ICP-OES
Inductively coupled plasma - optical emission spectrometry
Joides Resolution
Leg143
Morozovella aragonensis
Magnesium/Calcium ratio
Strontium/Calcium ratio
Morozovella lehneri
Morozovella spinulosa
Morozovella subbotinae
Morozovella velascoensis
North Pacific Ocean
Ocean Drilling Program
ODP
Sample code/label
Pacific
Planktonic foraminifera
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.841333
https://doi.org/10.1594/PANGAEA.841333
Description
Summary:To understand the climate dynamics of hypothesized past greenhouse intervals, it is essential to constrain tropical sea-surface temperatures (SST), yet existing proxy records give conflicting results. Here we present the first Mg/Ca-based study of pre-Quaternary SST and investigate early Paleogene (late Paleocene through late middle Eocene; 58.6-39.8 Ma) tropical temperatures, using planktonic foraminifera belonging to the genus Morozovella from Ocean Drilling Program Site 865 on Allison Guyot (western central equatorial Pacific Ocean). Calcification temperatures similar to or warmer than modern tropical SST are calculated using a range of assumptions regarding diagenesis, temperature calibration, and seawater Mg/Ca. Long-term warming is observed into the early Eocene (54.8-49.0 Ma), with peak SST between 51 and 48 Ma and rapid cooling of 4°C beginning at 48 Ma. These findings are inconsistent with the d18O-based SST previously estimated for this site.

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