Data

Determining main carbonate mineralogy, and the primary components of the non carbonate fraction, at four depths in core GC12, 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/20156510-251b-11dc-aba4-00188b4c0af8&rft.title=Determining main carbonate mineralogy, and the primary components of the non carbonate fraction, at four depths in core GC12, collected from the Capricorn Channel.&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/20156510-251b-11dc-aba4-00188b4c0af8&rft.description=A gravity core (GC12) was collected from a depth of 990.5 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 ~175cm into the core. Four samples were collected for X-ray Diffraction (XRD) analysis; the top two, at the sediment surface (GC12-0) and at 30cm (GC12-30) represent interglacial sediment, while the lower two, at 210cm (GC12-210) and 330cm (GC12-330) represent glacial sediment. XRD analysis suggests that the majority of the carbonate is calcite during the interglacials, primarily from pelagic carbonate production. During the glacials and transitions more quartz, feldspar, aragonite and Mg calcite are present. This suggests that there is a changing dominance of pelagic, terrigenous and reef platform material within the core related to sea-level variations.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 four samples within core GC12. Two samples, at the sediment surface and at 30cm, represents interglacial sediment, while the deeper two samples, at 210cm and 330cm, 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 0.07 - 1.7%. Parameters: XRD run number, percentage of sample components (%), total percentage (%).&rft.creator=Bostock, Helen &rft.creator=Opdyke, Bradley, Dr &rft.date=2007&rft.coverage=153.83198,-23.57259 153.83270,-23.57258 153.83264,-23.57319 153.83192,-23.57316 153.83198,-23.57259&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=990.5; downlimit=990.5&rft.coverage=uplimit=990.5; downlimit=990.5&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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A gravity core (GC12) was collected from a depth of 990.5 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 ~175cm into the core. Four samples were collected for X-ray Diffraction (XRD) analysis; the top two, at the sediment surface (GC12-0) and at 30cm (GC12-30) represent interglacial sediment, while the lower two, at 210cm (GC12-210) and 330cm (GC12-330) represent glacial sediment. XRD analysis suggests that the majority of the carbonate is calcite during the interglacials, primarily from pelagic carbonate production. During the glacials and transitions more quartz, feldspar, aragonite and Mg calcite are present. This suggests that there is a changing dominance of pelagic, terrigenous and reef platform material within the core related to sea-level variations.

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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 four samples within core GC12. Two samples, at the sediment surface and at 30cm, represents interglacial sediment, while the deeper two samples, at 210cm and 330cm, 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 0.07 - 1.7%. 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: 28 06 2007

Data time period: 1997 to 1997

This dataset is part of a larger collection

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153.83198,-23.57259 153.8327,-23.57258 153.83264,-23.57319 153.83192,-23.57316 153.83198,-23.57259

153.83231,-23.572885

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=990.5; downlimit=990.5

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_GC12_5_data.xls)

url : https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/20156510-251b-11dc-aba4-00188b4c0af8/attachments/ANU_Bostock_GC12_5_data.xls

Core data - Capricorn Channel (aodn: bluenet_datasets_capricorn_channel)

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

global : 442c6f30-2501-11dc-aba4-00188b4c0af8

Identifiers
  • global : 20156510-251b-11dc-aba4-00188b4c0af8