Sangiorgi, Francesca, Passchier, Sandra, Salzmann, Ulrich, Schouten, Stefan, Pross, Jorg, Bijl, Peter, Tauxe, Lisa, Bendle, James, Escutia, Carlotta and Brinkhuis, Henk (2012) Middle Miocene environmental and climatic evolution at the Wilkes Land margin, East Antarctica. In: American Geophysical Union, Fall Meeting 2012, 3-7 December 2012, San Francisco, CA.
Full text not available from this repository. (Request a copy)Abstract
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 indeed 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.
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Additional Information: | Poster PP23A-2027 |
| Subjects: | F800 Physical and Terrestrial Geographical and Environmental Sciences |
| Department: | Faculties > Engineering and Environment > Geography and Environmental Sciences |
| Related URLs: | |
| Depositing User: | Ay Okpokam |
| Date Deposited: | 05 Nov 2014 10:19 |
| Last Modified: | 13 Oct 2019 00:32 |
| URI: | http://nrl.northumbria.ac.uk/id/eprint/17923 |
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