Data

Determining main carbonate mineralogy, and the primary components of the non carbonate fraction, at three depths in core GC11, 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/7341d810-2479-11dc-95fb-00188b4c0af8&rft.title=Determining main carbonate mineralogy, and the primary components of the non carbonate fraction, at three depths in core GC11, collected from the Capricorn Channel.&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/7341d810-2479-11dc-95fb-00188b4c0af8&rft.description=A gravity core (GC11) was collected from a depth of 502 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 ~30cm into the core. Three samples were collected for XRD analysis; at the sediment surface (GC11-0) representing interglacial sediment, at 260cm (GC11-260) also representing interglacial sediment, and from 160cm (GC11-160) - representing glacial sediment. XRD analysis shows that the majority of the interglacial sample (GC11-260) carbonate is made up of calcite. The glacial sample (GC11-160) is only 50% CaCO3 with the rest of the sample made up of quartz and clays.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 GC11. Two samples, at the sediment surface and at 260cm, represents interglacial sediment, while the final sample at 160cm 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 - 2.41%. Parameters: XRD run number, percentage of sample components (%), total percentage (%).&rft.creator=Bostock, Helen &rft.creator=Opdyke, Bradley, Dr &rft.date=2007&rft.coverage=153.36627,-23.38420 153.36699,-23.38428 153.36696,-23.38481 153.36632,-23.38482 153.36627,-23.38420&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=502; downlimit=502&rft.coverage=uplimit=502; downlimit=502&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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Creative Commons Attribution 2.5 Australia License
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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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Full description

A gravity core (GC11) was collected from a depth of 502 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 ~30cm into the core. Three samples were collected for XRD analysis; at the sediment surface (GC11-0) representing interglacial sediment, at 260cm (GC11-260) also representing interglacial sediment, and from 160cm (GC11-160) - representing glacial sediment. XRD analysis shows that the majority of the interglacial sample (GC11-260) carbonate is made up of calcite. The glacial sample (GC11-160) is only 50% CaCO3 with the rest of the sample made up of quartz and clays.

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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 GC11. Two samples, at the sediment surface and at 260cm, represents interglacial sediment, while the final sample at 160cm 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 - 2.41%. 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: 27 06 2007

Data time period: 1997 to 1997

This dataset is part of a larger collection

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153.36627,-23.3842 153.36699,-23.38428 153.36696,-23.38481 153.36632,-23.38482 153.36627,-23.3842

153.36663,-23.38451

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=502; downlimit=502

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

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Other Information
(ANU_Bostock_GC11_5_data.xls)

url : https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/7341d810-2479-11dc-95fb-00188b4c0af8/attachments/ANU_Bostock_GC11_5_data.xls

Core data - Capricorn Channel (aodn: bluenet_datasets_capricorn_channel)

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

global : 2b6c31c0-2465-11dc-95fb-00188b4c0af8

Identifiers
  • global : 7341d810-2479-11dc-95fb-00188b4c0af8