Magnetic Susceptibility, Calcium Carbonate and the Geochemical Composition of Sediments from the Australian Continental Margin

• Other Authors: Australian Geological Survey Organisation (publisher), Commonwealth of Australia (Geoscience Australia) (distributor), Commonwealth of Australia (Geoscience Australia) (owner), Commonwealth of Australia (Geoscience Australia) (pointOfContact), ED (hasAssociationWith), Heggie, D.T. (author), Lane, J.L. (author), Manager Client Services (custodian), PRODUCTS (custodian)
• Format: Text
• Language: unknown
• Published: Australian Ocean Data Network
• Subjects: geoscientificInformation; GA Publication; Record; marine survey; marine; AU-EEZ; EARTH SCIENCES; Published_External; Planktonic foraminifera
• Online Access: https://researchdata.edu.au/magnetic-susceptibility-calcium-continental-margin/682789; https://pid.geoscience.gov.au/dataset/ga/14691

Maintenance and Update Frequency: unknown Statement: Legacy product, lineage not available Several gravity cores from the west (3), south (3) and east (5) Australian continental margin have been sampled and analysed for magnetic susceptibility, percent calcium carbonate, Fe203, Al203 and Si02 (% wt) and other trace element contents. Thecores sampled from the west Australian continental margin were from the Exmouth Plateau, and the Carnarvon Terrace. Sampling from the south Australian continental margin was from the west Ceduna Terrace and the Eyre Terrace and the cores sampled from the east Australian continental margin were collected offshore Evans Head. 8180 isotope data on planktonic foraminifera have been used to provide a chronological control on those cores collected from the western margin, to determine sediment accumulation rates and identify Late Quaternary isotopic stages, includingthe last glacial maximum (LGM) and the last interglacial (LIG). These same data are not available from other areas surveyed although sedimentation rates of about 1cm/kyr have been estimated from 14C data from the eastern continental margin sediments offshore Evans Head. The down-core total magnetic susceptibility profiles generally show similar patterns within each survey area. The magnetic susceptibility profiles for those cores from thewestern margin (Exmouth Plateau and Carnarvon Terrace) show relatively high valuesin the Holocene and around the LIG, and relatively low values during the LGM. Patterns of down-core variations in magnetic susceptibility could also be recognised in gravity cores from the eastern margin offshore Evans Head. Here, magnetic susceptibilities were relatively high around the LIG (similar to the western margin), but magnetic susceptibility were low in Holocene sediments, perhaps because of diagenetic remobilisation of iron in the core-tops. In general no distinct patterns are recognisable in the down-core magnetic susceptibility profiles from the southern margin. The down-core profiles of ...