Data

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

Australian Ocean Data Network
Bostock, Helen ; Opdyke, Bradley, Dr
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/9dc893c0-2533-11dc-aba4-00188b4c0af8&rft.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.&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/9dc893c0-2533-11dc-aba4-00188b4c0af8&rft.description=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.Maintenance and Update Frequency: notPlannedStatement: For X-ray Diffraction (XRD) analysis samples were ground in an agate mortar with acetone or ethanol, then dried, and filled into side-packed sample holders. Powder diffraction data was collected at room temperature with a Siemens D501 diffractometer at the Department of Earth and Marine Science, The Australian National University. The diffractometer was equipped with a curved graphite monochromator, a scintillation detector, and CuK alpha radiation was used. Scans were recorded in one pass from 2 to 70 degrees 2-theta, using a step-width of 0.02 degrees and a scan speed of 1 degree per minute. The results were interpreted using the SIEMENS software package Diffracplus Eva (2000), and quantitative estimates were performed using the program Siroquant 2.5.Statement: XRD analysis was undertaken for two samples within core GC13. The first, at the sediment surface represents interglacial sediment, while the second sample at 90cm, represents glacial sediments. Clay data must be treated with caution since it has been suggested that clay minerals, transported to the coast by river suspended loads, undergo significant diagenesis within environments like mangroves. The percentages of sample components are not exact and the dataset also displays the % error of each component. Errors range from 0.06 - 0.66%. Parameters: XRD run number, sample code and depth (cm), percentage of sample components (%), total percentage (%).&rft.creator=Bostock, Helen &rft.creator=Opdyke, Bradley, Dr &rft.date=2007&rft.coverage=154.22556,-23.78808 154.22643,-23.78810 154.22636,-23.78872 154.22559,-23.78866 154.22556,-23.78808&rft.coverage=westlimit=154; southlimit=-24; eastlimit=154.5; northlimit=-23.5&rft.coverage=westlimit=154; southlimit=-24; eastlimit=154.5; northlimit=-23.5&rft.coverage=uplimit=1482; downlimit=1482&rft.coverage=uplimit=1482; downlimit=1482&rft_rights=Creative Commons Attribution 2.5 Australia License http://creativecommons.org/licenses/by/2.5/au/&rft_rights=The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).&rft_subject=environment&rft_subject=SEDIMENTS&rft_subject=EARTH SCIENCE&rft_subject=PALEOCLIMATE&rft_subject=OCEAN/LAKE RECORDS&rft_subject=SEDIMENT COMPOSITION&rft_subject=OCEANS&rft_subject=MARINE SEDIMENTS&rft_subject=core_depth&rft_subject=amount_of_sample_components&rft_subject=error&rft.type=dataset&rft.language=English Access the data
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The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).

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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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Maintenance and Update Frequency: notPlanned
Statement: For X-ray Diffraction (XRD) analysis samples were ground in an agate mortar with acetone or ethanol, then dried, and filled into side-packed sample holders. Powder diffraction data was collected at room temperature with a Siemens D501 diffractometer at the Department of Earth and Marine Science, The Australian National University. The diffractometer was equipped with a curved graphite monochromator, a scintillation detector, and CuK alpha radiation was used. Scans were recorded in one pass from 2 to 70 degrees 2-theta, using a step-width of 0.02 degrees and a scan speed of 1 degree per minute. The results were interpreted using the SIEMENS software package Diffracplus Eva (2000), and quantitative estimates were performed using the program Siroquant 2.5.
Statement: XRD analysis was undertaken for two samples within core GC13. The first, at the sediment surface represents interglacial sediment, while the second sample at 90cm, represents glacial sediments. Clay data must be treated with caution since it has been suggested that clay minerals, transported to the coast by river suspended loads, undergo significant diagenesis within environments like mangroves. The percentages of sample components are not exact and the dataset also displays the % error of each component. Errors range from 0.06 - 0.66%. Parameters: XRD run number, sample code and depth (cm), percentage of sample components (%), total percentage (%).

Notes

Credit
Funded by The Australian Research Council (ARC)
Credit
Funded by The Australian National University (ANU) Faculties Research Grant Scheme
Purpose
To help determine changes in the carbonate mineralogy and terrestrial influx, which may provide some useful palaeoclimate information. Very little previous work has been undertaken within this area.

Issued: 25 06 2007

Data time period: 1997 to 1997

This dataset is part of a larger collection

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154.22556,-23.78808 154.22643,-23.7881 154.22636,-23.78872 154.22559,-23.78866 154.22556,-23.78808

154.225995,-23.7884

154.5,-23.5 154.5,-24 154,-24 154,-23.5 154.5,-23.5

154.25,-23.75

text: westlimit=154; southlimit=-24; eastlimit=154.5; northlimit=-23.5

text: uplimit=1482; downlimit=1482

Subjects
EARTH SCIENCE | MARINE SEDIMENTS | OCEAN/LAKE RECORDS | OCEANS | PALEOCLIMATE | Sediment Composition | Sediments | amount_of_sample_components | core_depth | environment | error |

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Other Information
(ANU_Bostock_GC13_5_data.xls)

url : https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/9dc893c0-2533-11dc-aba4-00188b4c0af8/attachments/ANU_Bostock_GC13_5_data.xls

Core data - Capricorn Channel (aodn: bluenet_datasets_capricorn_channel)

url : http://geoserver-123.aodn.org.au/geoserver/wms

global : e231da30-2533-11dc-aba4-00188b4c0af8

Identifiers
  • global : 9dc893c0-2533-11dc-aba4-00188b4c0af8