Data

Determining main carbonate mineralogy, and the primary components of the non carbonate fraction, at two depths in core GC10, 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/9ea35af0-2394-11dc-a78e-00188b4c0af8&rft.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.&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/9ea35af0-2394-11dc-a78e-00188b4c0af8&rft.description=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.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 three samples within core GC10. The first, at the sediment surface, represents interglacial sediment, while the deeper samples at 100cm and 270cm represent 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 - 2.37%. Parameters: XRD run number, percentage of sample components (%), total percentage (%).&rft.creator=Bostock, Helen &rft.creator=Opdyke, Bradley, Dr &rft.date=2007&rft.coverage=152.79969,-23.99576 152.80030,-23.99580 152.80028,-23.99631 152.79964,-23.99624 152.79969,-23.99576&rft.coverage=westlimit=151.5; southlimit=-24.5; eastlimit=153; northlimit=-23&rft.coverage=westlimit=151.5; southlimit=-24.5; eastlimit=153; northlimit=-23&rft.coverage=uplimit=335; downlimit=335&rft.coverage=uplimit=335; downlimit=335&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=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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Brief description

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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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 three samples within core GC10. The first, at the sediment surface, represents interglacial sediment, while the deeper samples at 100cm and 270cm represent 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 - 2.37%. Parameters: XRD run number, 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: 26 06 2007

Data time period: 1997 to 1997

This dataset is part of a larger collection

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152.79969,-23.99576 152.8003,-23.9958 152.80028,-23.99631 152.79964,-23.99624 152.79969,-23.99576

152.79997,-23.996035

153,-23 153,-24.5 151.5,-24.5 151.5,-23 153,-23

152.25,-23.75

text: westlimit=151.5; southlimit=-24.5; eastlimit=153; northlimit=-23

text: uplimit=335; downlimit=335

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

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(ANU_Bostock_GC10_5_data.xls)

uri : https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/9ea35af0-2394-11dc-a78e-00188b4c0af8/attachments/ANU_Bostock_GC10_5_data.xls

global : a1c4e840-237e-11dc-a78e-00188b4c0af8

Identifiers
  • global : 9ea35af0-2394-11dc-a78e-00188b4c0af8
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