Palynological and organic geochemical data from middle Eocene Southwest Pacific sediments ...

Global climate cooled from the early Eocene hothouse (~52-50 Ma) to the latest Eocene (~34 Ma). At the same time, the tectonic evolution of the Southern Ocean was characterized by the opening and deepening of circum-Antarctic gateways, which affected both surface- and deep-ocean circulation. The Tas...

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Bibliographic Details
Main Authors: Cramwinckel, Margot J, Woelders, Lineke, Huurdeman, Emiel P, Peterse, Francien, Gallagher, Stephen John, Pross, Jörg, Burgess, Catherine E, Reichart, Gert-Jan, Sluijs, Appy, Bijl, Peter K
Format: Article in Journal/Newspaper
Language:English
Published: PANGAEA 2020
Subjects:
dinocyst
GDGT
MECO
middle Eocene
Antarctic
Pacific
Southern Ocean
Antarc*
Antarctica
Online Access:https://dx.doi.org/10.1594/pangaea.922215
https://doi.pangaea.de/10.1594/PANGAEA.922215
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Summary:Global climate cooled from the early Eocene hothouse (~52-50 Ma) to the latest Eocene (~34 Ma). At the same time, the tectonic evolution of the Southern Ocean was characterized by the opening and deepening of circum-Antarctic gateways, which affected both surface- and deep-ocean circulation. The Tasmanian Gateway played a key role in regulating ocean throughflow between Australia and Antarctica. Southern Ocean surface currents through and around the Tasmanian Gateway have left recognizable tracers in the spatiotemporal distribution of plankton fossils, including organic-walled dinoflagellate cysts. This spatiotemporal distribution depends on both the physico-chemical properties of the water masses and the path of surface-ocean currents. The extent to which climate and tectonics have influenced the distribution and composition of surface currents and thus fossil assemblages has, however, remained unclear. In particular, the contribution of climate change to oceanographic changes, superimposed on long-term and ...

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