Glacial-Interglacial Sediment Records From Australian Continental Margin

Sediment cores from the Exmouth Plateau, Perth Basin, and Ceduna Terrace off Australia provide evidence of glacial-interglacial oceanographic changes. The dataset includes sediment accumulation rates, biogenic component rates, and benthic foraminiferal data from the last glacial maximum to the Holocene. It was collected by the Australian Geological Survey Organisation and published via the Australian Ocean Data Network.

Use Cases

• Compare glacial versus Holocene sediment accumulation rates for CaCO3 and organic carbon to model past ocean productivity.
• Analyze benthic foraminiferal abundances and stable isotope data (13C) to reconstruct intermediate and deep water chemistry since the LGM.
• Correlate authigenic uranium concentrations with glacial sediment layers to infer redox conditions and productivity shifts.
• Use LGM 13C profiles from the southeastern Indian Ocean cores to contrast with depletion patterns observed in other ocean basins.

Strengths

• Data from 14 sediment cores across two distinct regions (Exmouth Plateau/Perth Basin and Ceduna Terrace).
• Provides quantitative comparisons (1.5-2 times higher) for key metrics like accumulation rates between the LGM and Holocene.
• Includes multiple proxy types: sediment rates, biogenic components, foraminiferal data, and geochemical isotopes.

Limitations

• Specific row counts, column details, and sample sizes for each measurement are not provided.
• Data is presented in PDF/HTML formats, which may require extraction for computational analysis.
• Temporal coverage is focused on the transition from the Last Glacial Maximum (~20,000 years ago) to the Holocene, with no explicit modern data.

Provenance

Source

Australian Geological Survey Organisation via Australian Ocean Data Network.

Collection Method

Collection and analysis of sediment cores from the Australian continental margin.

Time Range

Last Glacial Maximum (~20,000 years ago) to the Holocene.

Freshness

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Geography

Southeastern Indian Ocean off Western Australia (Exmouth Plateau, Perth Basin) and the Great Australian Bight (Ceduna Terrace).