Eocene-Oligocene paleomagnetic and foraminiferal stable isotopic and Mg/Ca record from South Australia ...

The Eocene-Oligocene transition (EOT) marked the initiation of large-scale Antarctic glaciation. This fundamental change in Cenozoic climate state is recorded in deep-sea sediments by a rapid benthic foraminiferal δ18O increase and appearance of ice-rafted debris in the Southern Ocean. However, we k...

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Bibliographic Details
Main Authors: Haiblen, Anna M, Opdyke, Bradley N, Roberts, Andrew P, Heslop, David, Wilson, Paul A
Format: Dataset
Language:English
Published: PANGAEA 2019
Subjects:
benthic foraminiferal stable isotopes and Mg/Ca
Eocene-Oligocene boundary
paleoclimatology
paleomagnetic record of C13r/C13n
South Australia
Site
Sample type
Stratigraphy
Stratigraphic height
Foraminifera, benthic δ18O
Foraminifera, benthic δ13C
Magnesium/Calcium ratio
Inclination
Declination
Method comment
Number
Multiple investigations
Antarc*
Antarctic
Southern Ocean
Online Access:https://dx.doi.org/10.1594/pangaea.907397
https://doi.pangaea.de/10.1594/PANGAEA.907397
Description
Summary:The Eocene-Oligocene transition (EOT) marked the initiation of large-scale Antarctic glaciation. This fundamental change in Cenozoic climate state is recorded in deep-sea sediments by a rapid benthic foraminiferal δ18O increase and appearance of ice-rafted debris in the Southern Ocean. However, we know little about the magnitude of cooling associated with the EOT in shallow water environments, particularly at mid- to high-latitudes. Here we present new paleomagnetic and stratigraphic records of the C13r/C13n magnetochron boundary and the EOT in the clay-rich Blanche Point Formation (BPF), South Australia. The BPF was deposited in a shallow shelf setting (water depths of <100 m) at a paleolatitude of ~51 °S. We present high-resolution δ18O, δ13C, and Mg/Ca records of environmental change from well-preserved benthic foraminifera of latest Eocene age at this site. A marked, negative δ13C excursion occurs immediately before a δ18O increase, which may be a globally representative signal. A ~2 °C cooling of ... : Supplement to: Haiblen, Anna M; Opdyke, Bradley N; Roberts, Andrew P; Heslop, David; Wilson, Paul A (2019): Midlatitude Southern Hemisphere Temperature Change at the End of the Eocene Greenhouse Shortly Before Dawn of the Oligocene Icehouse. Paleoceanography and Paleoclimatology, 34(12), 1995-2004 ...

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