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Determining main carbonate mineralogy, and the primary components of the non carbonate fraction, at two depths in core GC13, collected from the Capricorn Channel.

Created 25/06/2017

Updated 11/08/2023

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A gravity core (GC13) was collected from a depth of 1482 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 ~90cm into the core. Two samples were collected for X-ray Diffraction (XRD) analysis; from the sediment surface (GC13-0) representing interglacial sediment, while the second sample, from 90cm (GC13-90) represents glacial sediment. XRD analysis of these samples show a slight increase in carbonate percentage during the interglacial compared to the glacial, with increased clay and quartz during the glacial. During the interglacial there are minor amounts of Mg calcite, which suggests that there is little influence from the reef platform on the sediments during the present sea-level, or that the core is presently below the Mg calcite compensation depth.

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Title Determining main carbonate mineralogy, and the primary components of the non carbonate fraction, at two depths in core GC13, collected from the Capricorn Channel.
Language English
Licence Creative Commons Attribution 2.5 Australia
Landing Page https://data.gov.au/data/dataset/6b41f38b-f0b5-4cf3-b8d4-f9e28876c7c1
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