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Determining main carbonate mineralogy, and the primary components of the non carbonate fraction, at two depths in core GC10, collected from the Capricorn Channel.

Created 25/06/2017

Updated 11/08/2023

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A gravity core (GC10) was collected from a depth of 335 mbsl within the Capricorn Channel, southern Great Barrier Reef (GBR). Analysis of other parameters revealed the Last Glacial Maximum (LGM) sitting at a depth of ~130cm into the core. Three samples were collected for X-ray Diffraction (XRD) analysis; at the sediment surface (GC10-0) representing interglacial sediment, 100cm depth (GC10-100) and 270cm (GC10-270) - both of which represent glacial sediment. XRD analysis shows that during the interglacials aragonite increases relative to calcite, presumably as a result of shelf carbonate transported down the channel. During the glacials there is a higher percentage of quartz and feldspar, but reduced clay content in the non-carbonate fraction. This suggests that the terrigenous fraction is dominant within the sediments, however the energy in the environment is possibly too high for the clays to settle.

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Title Determining main carbonate mineralogy, and the primary components of the non carbonate fraction, at two depths in core GC10, collected from the Capricorn Channel.
Language English
Licence Creative Commons Attribution 2.5 Australia
Landing Page https://data.gov.au/data/dataset/7ac24a05-4f8b-4409-80a7-d4478fec1157
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