Data

The percentage of CaCO3 in samples taken from various depths in core GC12, located in 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/031f69c0-251a-11dc-aba4-00188b4c0af8&rft.title=The percentage of CaCO3 in samples taken from various depths in core GC12, located in the Capricorn Channel&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/031f69c0-251a-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). The percentage of CaCO3 in samples collected from different depths were analysed, along with other parameters, to determine changes in carbonate mineralogy and terrestrial influx. Levels of CaCO3% exhibit an higher percentage of >60% during the middle of Marine Isotope Stage (MIS) 3, levels similar to those seen in MIS 1. Throughout MIS 2 and during the glacial termination the CaCO3% remains relatively constant at ~60%. CaCO3 drops to 50% prior to a possible Antarctic cold reversal (between 14 ka BP and 12 ka BP) at 80cm in the core, before recovering to the 65-70% in the Holocene again.Maintenance and Update Frequency: notPlannedStatement: A sample from each depth was dried in the oven and ground up into a fine powder (~100mm) using a mortar and pestle. Approximately 1g of each sample was weighed accurately. 20ml of ~1mol/l HCl was added to the sample, and then heated and stirred until all the carbonate had reacted. Resulting solution was titrated with 0.5mol/l NaOH using the Metrohm Ion analysis 716 DMS Titrino series 6.0 to determine the CaCO3 %. Error range of 2%Statement: Values for CaCO3 % are recorded at 5cm, 10cm, 15cm, 20cm and then for every 10cm down the core until reaching a depth of 510cm. Percentage values for calcium carbonate have an error range of ± 2%. Parameters: Depth through core (cm), percentage of calcium carbonate (%).&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=CARBONATE&rft_subject=EARTH SCIENCE&rft_subject=OCEANS&rft_subject=OCEAN CHEMISTRY&rft_subject=Oceans | Marine Sediments | Carbonate Sediments&rft_subject=core_depth&rft_subject=Amount_of_calcium_carbonate&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 (GC12) was collected from a depth of 990.5 mbsl within the Capricorn Channel, southern Great Barrier Reef (GBR). The percentage of CaCO3 in samples collected from different depths were analysed, along with other parameters, to determine changes in carbonate mineralogy and terrestrial influx. Levels of CaCO3% exhibit an higher percentage of >60% during the middle of Marine Isotope Stage (MIS) 3, levels similar to those seen in MIS 1. Throughout MIS 2 and during the glacial termination the CaCO3% remains relatively constant at ~60%. CaCO3 drops to 50% prior to a possible Antarctic cold reversal (between 14 ka BP and 12 ka BP) at 80cm in the core, before recovering to the 65-70% in the Holocene again.

Lineage

Maintenance and Update Frequency: notPlanned
Statement: A sample from each depth was dried in the oven and ground up into a fine powder (~100mm) using a mortar and pestle. Approximately 1g of each sample was weighed accurately. 20ml of ~1mol/l HCl was added to the sample, and then heated and stirred until all the carbonate had reacted. Resulting solution was titrated with 0.5mol/l NaOH using the Metrohm Ion analysis 716 DMS Titrino series 6.0 to determine the CaCO3 %. Error range of 2%
Statement: Values for CaCO3 % are recorded at 5cm, 10cm, 15cm, 20cm and then for every 10cm down the core until reaching a depth of 510cm. Percentage values for calcium carbonate have an error range of ± 2%. Parameters: Depth through core (cm), percentage of calcium carbonate (%).

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
Amount_of_calcium_carbonate | Carbonate | EARTH SCIENCE | OCEAN CHEMISTRY | OCEANS | Oceans | Marine Sediments | Carbonate Sediments | core_depth | environment |

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Other Information
(ANU_Bostock_GC12_4_data.xls)

uri : https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/031f69c0-251a-11dc-aba4-00188b4c0af8/attachments/ANU_Bostock_GC12_4_data.xls

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

Identifiers
  • global : 031f69c0-251a-11dc-aba4-00188b4c0af8
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