Brief description
A gravity core (GC10) was collected from a depth of 335 mbsl within the Capricorn Channel, southern Great Barrier Reef (GBR). Isotopic values for 18O and 13C were obtained from Gs. ruber and correlated with the SPECMAP age-model. Radiocarbon dating of G. sacculifer was also undertaken at three sample depths, and then corrected and correlated with the curve. This yielded an age vs. depth profile from which it was possible to determine approximate sedimentation rates. The results place the Last Glacial Maximum (LGM) date at 130cm and highlights a peak in sedimentation rate during the penultimate glacial / interglacial transition. Down the core the sedimentation rates vary considerably from a high of 12 cm/kyr down to <1 cm/kyr. This is probably the result of a considerable change in the sediment flux related to the sea level fluctuations.Lineage
Maintenance and Update Frequency: notPlannedRadiocarbon dating was undertaken on ~300 individuals of G. sacculifer from >300µm size fraction. Samples were rinsed, ultrasonically cleaned, and then dried. Samples were then dissolved in 103% orthophosphoric acid and the CO2 collected under vacuum. The CO2 was converted to graphite by reacting with hydrogen over an iron catalyst at 600oC. The graphite, once formed, is transferred to small cathodes and run on the AMS.
Notes
CreditFunded by The Australian Research Council (ARC)
Funded by The Australian National University (ANU) Faculties Research Grant Scheme
To determine the sedimentological variations with sea-level over the last glacial/ interglacial cycle in the Capricorn Channel. Very little previous work has been undertaken within this area.
Issued: 25 06 2007
Data time period: 1997 to 1997
text: westlimit=151.5; southlimit=-24.5; eastlimit=153; northlimit=-23
text: uplimit=335; downlimit=335
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