Paleomagnetic and stable isotope measurements and distribution of benthic foraminifera in sediment core PS1388-3 from the Antarctic continental margin in the eastern Weddell Sea

A stable isotope record from the eastern Weddell Sea from 69°S is presented. For the first time, a 250,000-yr record from the Southern Ocean can be correlated in detail to the global isotope stratigraphy. Together with magnetostratigraphic, sedimentological and micropalaeontological data, the strati...

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Bibliographic Details
Main Authors: Mackensen, Andreas, Grobe, Hannes, Hubberten, Hans-Wolfgang, Spieß, Volkhard, Fütterer, Dieter K
Format: Dataset
Language:English
Published: PANGAEA 1989
Subjects:
ANT-IV/3
Atka Bay
AWI_Paleo
Gravity corer (Kiel type)
Paleoenvironmental Reconstructions from Marine Sediments @ AWI
Polarstern
PS08
PS08/366
PS1388-3
SFB261
SL
South Atlantic in Late Quaternary: Reconstruction of Budget and Currents
Antarctic
Southern Ocean
The Antarctic
Weddell Sea
Weddell
Atka
Antarc*
Ice Shelf
Iceberg*
Neogloboquadrina pachyderma
Planktonic foraminifera
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.549061
https://doi.org/10.1594/PANGAEA.549061
Description
Summary:A stable isotope record from the eastern Weddell Sea from 69°S is presented. For the first time, a 250,000-yr record from the Southern Ocean can be correlated in detail to the global isotope stratigraphy. Together with magnetostratigraphic, sedimentological and micropalaeontological data, the stratigraphic control of this record can be extended back to 910,000 yrs B.P. A time scale is constructed by linear interpolation between confirmed stratigraphic data points. The benthic d18O record (Epistominella exigua) reflects global continental ice volume changes during the Brunhes and late Matuyama chrons, whereas the planktonic isotopic record (Neogloboquadrina pachyderma) may be influenced by a meltwater lid caused by the nearby Antarctic ice shelf and icebergs. The worldwide climatic improvement during deglaciations is documented in the eastern Weddell Sea by an increase in production of siliceous plankton followed, with a time lag of approximately 10,000 yrs, by planktonic foraminifera production. Peak values in the difference between planktonic and benthic d13C records, which are 0.5 per mil higher during warm climatic periods than during times with expanded continental ice sheets, also suggest increased surface productivity during interglacials in the Southern Ocean.

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