Articles | Volume 40, issue 2
J. Micropalaeontol., 40, 175–193, 2021
https://doi.org/10.5194/jm-40-175-2021
J. Micropalaeontol., 40, 175–193, 2021
https://doi.org/10.5194/jm-40-175-2021
Research article
29 Oct 2021
Research article | 29 Oct 2021

Late Eocene–early Miocene evolution of the southern Australian subtropical front: a marine palynological approach

Frida S. Hoem et al.

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Cited articles

Amoo, M., Salzmann, U., Pound, M. J., Thompson, N., and Bijl, P. K.: Eocene to Oligocene vegetation and climate in the Tasmanian Gateway region controlled by changes in ocean currents and pCO2, Clim. Past Discuss. [preprint], https://doi.org/10.5194/cp-2021-131, in review, 2021. 
Bijl, P. K., Pross, J., Warnaar, J., Stickley, C. E., Huber, M., Guerstein, R., Houben, A. J., Sluijs, A., Visscher, H., and Brinkhuis, H.: Environmental forcings of Paleogene Southern Ocean dinoflagellate biogeography, Paleoceanography, 26, PA1202, https://doi.org/10.1029/2009PA001905, 2011. 
Bijl, P. K., Bendle, J. A., Bohaty, S. M., Pross, J., Schouten, S., Tauxe, L., Stickley, C. E., McKay, R. M., Rohl, U., Olney, M., Sluijs, A., Escutia, C., Brinkhuis, H., and Expedition 318 scientists: Eocene cooling linked to early flow across the Tasmanian Gateway, P. Natl. Acad. Sci. USA, 110, 9645–9650, https://doi.org/10.1073/pnas.1220872110, 2013. 
Bijl, P. K., Houben, A. J., Hartman, J. D., Pross, J., Salabarnada, A., Escutia, C., and Sangiorgi, F.: Paleoceanography and ice sheet variability offshore Wilkes Land, Antarctica-Part 2: Insights from Oligocene-Miocene dinoflagellate cyst assemblages, Clim. Past, 14, 1015–1033, https://doi.org/10.5194/cp-14-1015-2018, 2018. 
Boreham, C., Blevin, J., Duddy, I., Newman, J., Liu, K., Middleton, H., Macphail, M., and Cook, A.: Exploring the potential for oil generation, migration and accumulation in Cape Sorell–1, Sorell Basin, offshore West Tasmania, APPEA J., 42, 405–435, https://doi.org/10.1071/AJ01022, 2002. 
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Short summary
We use marine microfossil (dinocyst) assemblage data as well as seismic and tectonic investigations to reconstruct the oceanographic history south of Australia 37–20 Ma as the Tasmanian Gateway widens and deepens. Our results show stable conditions with typically warmer dinocysts south of Australia, which contrasts with the colder dinocysts closer to Antarctica, indicating the establishment of modern oceanographic conditions with a strong Southern Ocean temperature gradient and frontal systems.