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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 25/06/2017

Updated 11/08/2023

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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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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 English
Licence Creative Commons Attribution 2.5 Australia
Landing Page https://data.gov.au/data/dataset/fdf31b4d-4d15-464b-8bdc-8235c7d3d1cb
Contact Point
National Institute of Water and Atmosphere (NIWA)
h.bostock@niwa.co.nz
Reference Period 25/06/2017
Geospatial Coverage
Map data © OpenStreetMap contributors
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Data Portal Data.gov.au