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Determining main carbonate mineralogy, and the primary components of the non carbonate fraction, at two depths in core GC09, collected from the Capricorn Channel

Created 23/06/2025

Updated 23/06/2025

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A gravity core (GC09) was collected from a depth of 166m within the Capricorn Channel, southern Great Barrier Reef (GBR). Analysis of other parameters revealed the Last Glacial Maximum (LGM) sitting at a depth of ~60cm's into the core. For this reason two samples were collected for X-ray Diffraction (XRD) analysis, the first at a depth of 5cm (GC09-5) representing interglacial sediment, and the second from a depth of 60cm (GC09-60) representing glacial sediment. Both samples exhibited high Mg calcite and aragonite, compared with calcite, suggesting that the primary carbonate influx to the core is from the surrounding reef platform, rather than pelagic influences. There was also a 10% increase in non carbonate material during the glacial, and this was primarily made up of feldspars and quartz indicating a relative increase in terrestrial sediment during the LGM.

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Additional Info

Field Value
Title Determining main carbonate mineralogy, and the primary components of the non carbonate fraction, at two depths in core GC09, collected from the Capricorn Channel
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/c1a064a8-58bd-46c9-b254-eed1db3d5323
Contact Point
Australian Ocean Data Network
h.bostock@niwa.co.nz
Reference Period 01/01/1997 - 01/01/1997
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        151.5,
        -24.5
      ],
      [
        153.0,
        -24.5
      ],
      [
        153.0,
        -23.0
      ],
      [
        151.5,
        -23.0
      ],
      [
        151.5,
        -24.5
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Australian Oceans Data Network

Data Source

This dataset was originally found on Australian Oceans Data Network "Determining main carbonate mineralogy, and the primary components of the non carbonate fraction, at two depths in core GC09, collected from the Capricorn Channel". Please visit the source to access the original metadata of the dataset:
https://catalogue.aodn.org.au/geonetwork/srv/eng/csw/dataset/determining-main-carbonate-mineralogy-and-the-primary-components-of-the-non-carbonate-fraction-8