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| Titel |
Middle Miocene environmental and climatic evolution at the Wilkes Land margin, East Antarctica |
| VerfasserIn |
Francesca Sangiorgi, Peter Bijl, Sandra Passchier, Ulrich Salzmann, Stefan Schouten, Jörg Pross, Carlota Escutia, Henk Brinkhuis |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250111250
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| Publikation (Nr.) |
 EGU/EGU2015-15194.pdf |
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| Zusammenfassung |
| Integrated Ocean Drilling Program (IODP) Expedition 318 successfully drilled a Middle Miocene (~ 17 – 12.5 Ma) record from the Wilkes Land Margin at Site U1356A (63°18.6138’S, 135°59.9376’E), located at the transition between the continental rise and the abyssal plain at 4003 mbsl.
We present a multiproxy palynological (dinoflagellate cyst, pollen and spores), sedimentological and organic geochemical (TEX86, MBT/CBT) study, which unravels the environmental and climate variability across the Miocene Climatic Optimum (MCO, ~17-15 Ma) and the Mid Miocene Climate Transition (MMCT).
Several independent lines of evidence suggest a relatively warm climate during the MCO. Dinocyst and pollen assemblage diversity at the MCO is unprecedented for a Neogene Antarctic record and indicates a temperate, sea ice-free marine environment, with woody sub-antarctic vegetation with elements of forest/shrub tundra and peat lands along the coast. These results are further confirmed by relatively warm TEX86-derived Sea Surface Temperatures and mild MBT-derived continental temperatures, and by the absence of glacially derived deposits and very few ice-rafted clasts. A generally colder but highly dynamic environment is suggested for the interval 15-12.5 Ma. |
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