Citation:

08120099.2018.1495101

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Abstract:

We present an array of new proxy data and review existing ones from core Fr1/94-GC3 from the East Tasman Plateau. This core is positioned at the southern extreme of the East Australia Current and simultaneously records changes in both oceanography and environments both offshore and in southeastern Australia. Microfossils, including planktonic and benthic foraminifera, ostracods, coccoliths, and radiolarians, were studied to interpret palaeoceanographic changes. Sea-surface temperature was estimated using planktonic foraminifera, alkenones and radiolaria. From the silicate sediment fraction, the mean grain size of quartz grains was measured to detect changes in wind strength. An XRF scan of the entire core was used to determine the elemental composition to identify provenance of the sediment. We also compare these data with a pollen record from the same core provided in an accompanying paper that provides the longest well-dated record of vegetation change in southeastern Australia.

In an area of slow sedimentation, Fr1/94-GC3 provides a continuous record of change in southeastern Australia and the southern Tasman Sea over approximately the last 460,000 years. We determine that the East Australian Current varied in intensity through time and did not reach the core site during glacial periods, but was present east of Tasmania during all interglacial periods. The four glacial-interglacial periods recorded at the site vary distinctly in character with Marine Isotope Stage (MIS) 9 being the warmest and MIS 5 the longest. Through time, glacial periods have progressively become warmer and shorter. Deposition of airborne dust at the core site is more substantial during interglacial periods than glacials and is believed to derive from mainland Australia and not Tasmania. It is likely that the source and direction of the dust plume varied significantly with the wind regimes between glacials and interglacials as mean effective precipitation changed.

Related to:

De Deckker, Patrick; van der Kaars, Sander; Macphail, Michael K; Hope, Geoffrey S (2019): Land-sea correlations in the Australian region: 460 ka of changes recorded in a deep-sea core offshore Tasmania. Part 1: the pollen record. Australian Journal of Earth Sciences, 66(1), 1-15, https://doi.org/10.1080/08120099.2018.1495100

Coverage:

Latitude: -44.260000 * Longitude: 150.000000

Event(s):

FR1/94-GC3 * Latitude: -44.260000 * Longitude: 150.000000 * Elevation: -2667.0 m * Location: Southwest Pacific Ocean * Method/Device: Gravity corer (GC)

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

8 datasets

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Datasets listed in this publication series

De Deckker, P; Barrows, TT; Stuut, J-BW et al. (2018): Quartz grain diameter and sea-surface temperatures estimated using alkenones of sediment core FR1/94-GC3 from the East Tasman Plateau, Australia. https://doi.org/10.1594/PANGAEA.893213
De Deckker, P; Barrows, TT; Stuut, J-BW et al. (2018): Counts of key Foraminifera taxa of sediment core FR1/94-GC3 from the East Tasman Plateau, Australia. https://doi.org/10.1594/PANGAEA.893207
De Deckker, P; Barrows, TT; Stuut, J-BW et al. (2018): δ¹³C and δ¹⁸O isotopes from Foraminifera of sediment core FR1/94-GC3 from the East Tasman Plateau, Australia. https://doi.org/10.1594/PANGAEA.893210
De Deckker, P; Barrows, TT; Stuut, J-BW et al. (2018): Sea-surface temperatures estimated using planktonic foraminifera of sediment core FR1/94-GC3 from the East Tasman Plateau, Australia. https://doi.org/10.1594/PANGAEA.893206
De Deckker, P; Barrows, TT; Stuut, J-BW et al. (2018): Counts of key nanoplankton taxa of sediment core FR1/94-GC3 from the East Tasman Plateau, Australia. https://doi.org/10.1594/PANGAEA.893211
De Deckker, P; Barrows, TT; Stuut, J-BW et al. (2018): Ostracod counts of sediment core FR1/94-GC3 from the East Tasman Plateau, Australia. https://doi.org/10.1594/PANGAEA.893212
De Deckker, P; Barrows, TT; Stuut, J-BW et al. (2018): Quartz grain sizes of sediment core FR1/94-GC3 from the East Tasman Plateau, Australia. https://doi.org/10.1594/PANGAEA.893209
De Deckker, P; Barrows, TT; Stuut, J-BW et al. (2018): XRF data of sediment core FR1/94-GC3 from the East Tasman Plateau, Australia. https://doi.org/10.1594/PANGAEA.894322