Core MD88-784 was recovered during the French ASPARA IV cruise in 1988, aboard the Marion Dufresne. The core was located on the Tasman Fracture Zone of the Mid-Ocean Ridge, within the Polar Front Zone.
Isotopic analysis was performed on tests of the planktonic foraminifera Neogloboquadrina pachyderma (200-250um), and indicate that the core contains isotope stages 1 to 3. The base of the core is found to reach the oxygen isotope stage 3-4 boundary.
The core is considered to have lost the uppermost section of the core that converts the last 3kyr against the SPECMAP stack. The results also indicate that the Holocene period has the highest rates of sedimentation observed through time. Further variations (excluding isotope-stage 1) appear to indicate that a reduction of the sedimentation rate occurred during the interglacial periods, in contrast to that of the glacials.
Sediment was recovered using a Kullenberg core, aboard the research vessel Marion DuFresne.
The method used to produce diatom slides from sediment samples is described in the 'methodology' document uploaded with this record.
Sediment samples for analysis were taken at 10cm intervals from the sediment surface down to a depth of 490cm.
The core age model must be considered provisional since additional independent tie-points to age have not been made for the cores, such as AMS 14C dating of the foraminifera in the surface sediments, nor was the oxygen isotopic data of the cores at high resolution.
The core is considered to have lost the uppermost section of the core that corresponds to the last 3kyr.
Parameters: Core depth (cm), 18O isotope of N. pachyderma, tie points in SPECMAP age scale (Ka), corresponding SPECMAP age scale (Ka), linear sedimentation rate (cm/Ka), analyseries extrapolated age scale (Ka) at 10cm interval, core sample dry weights (gm), field of views counted, diatom subtotal count, number of diatom frustules (x1000000)/gm of dry weight, diatom tranfer function factor 1 loading, diatom tranfer function factor 2 loading, diatom tranfer function factor 3 loading, diatom tranfer function factor 4 loading, diatom tranfer function factor 5 loading, diatom tranfer function factor 6 loading.
To reconstruct the first sea-surface temperature and sea-ice record history of the Southern Ocean south of Australia.
Centre des Faibles Radioactivities mixte CNRS CEA (France)
Institute of Antarctic and Southern Ocean Studies (IASOS)
Institut Français pour la Recherche et Technologie Polaires (IFRTP)
Terres Australes et Antarctiques Françaises (TAAF)
Australian Postgraduate Research Awards (APRA)