Data

Quantifying the isotopic composition of oxygen and carbon with increasing depth in core GC09, 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/102fd170-22b0-11dc-8748-00188b4c0af8&rft.title=Quantifying the isotopic composition of oxygen and carbon with increasing depth in core GC09, located in the Capricorn Channel&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/102fd170-22b0-11dc-8748-00188b4c0af8&rft.description=A gravity core (GC09) was collected from a depth of 166m within the Capricorn Channel, southern Great Barrier Reef (GBR). The data from stable isotopes of Globigerinoides ruber were analysed to allow a preliminary understanding of the hemipelagic sedimentary environment over the last glacial / interglacial cycle. The results suggest that the core reaches the Last Glacial Maximum (LGM) at ~60cm depth, corresponding to isotopically heavier 18O. Other parameters were also analysed to assist in reaching this conclusion. This would give a relatively low sedimentation rate of 3cm / kyr, compared to 50cm / kyr for similar depths in the west Queensland trough.Maintenance and Update Frequency: notPlannedStatement: Samples for foraminifera picking were dried in the oven at 60oC before being re-soaked in distilled water. Samples were then wet sieved through a series of four mesh sizes before the size fractions were transferred to drying trays. After drying foraminifera were picked from under microscope for the large size fractions of >300 µm and >400µm. 10-15 white Gs. ruber were hand picked to give a total sample weight of 180-220µg for isotope analysis. The samples were washed in methanol and ultrasonicated for 30 secs to remove any surface and internal particles. The samples were analysed at the Research School of Earth Science, Australian National University, using an automated individual carbonate reaction (Kiel) device coupled with a Finnigan MAT-251 mass spectrometer.Statement: Both 18-O and 13-C values are provided for 3.5cm, 5cm, 15cm, 20cm and then every 10cm down the core to depth of 120cm. Mass spectrometer was run concurrently with international standards NBS-19 and NBS-18, and has a very small analytical error. Parameters: Depth in core (cm), oxygen-18 G. ruber (parts per thousand), carbon-13 G. ruber (parts per thousand).&rft.creator=Bostock, Helen &rft.creator=Opdyke, Bradley, Dr &rft.date=2007&rft.coverage=152.63469,-22.89476 152.63530,-22.89480 152.63528,-22.89526 152.63466,-22.89528 152.63469,-22.89476&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=166; downlimit=166&rft.coverage=uplimit=166; downlimit=166&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=ISOTOPES&rft_subject=EARTH SCIENCE&rft_subject=PALEOCLIMATE&rft_subject=OCEAN/LAKE RECORDS&rft_subject=FORAMINIFERS&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=PROTISTS&rft_subject=AMOEBOIDS&rft_subject=51200000&rft_subject=Foraminiferida&rft_subject=Foraminiferans&rft_subject=Foraminifera&rft_subject=core_depth&rft_subject=amount_of_oxygen-18_isotope_g._ruber&rft_subject=amount_of_carbon-13_isotope_g._ruber&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 (GC09) was collected from a depth of 166m within the Capricorn Channel, southern Great Barrier Reef (GBR). The data from stable isotopes of Globigerinoides ruber were analysed to allow a preliminary understanding of the hemipelagic sedimentary environment over the last glacial / interglacial cycle. The results suggest that the core reaches the Last Glacial Maximum (LGM) at ~60cm depth, corresponding to isotopically heavier 18O. Other parameters were also analysed to assist in reaching this conclusion. This would give a relatively low sedimentation rate of 3cm / kyr, compared to 50cm / kyr for similar depths in the west Queensland trough.

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Maintenance and Update Frequency: notPlanned
Statement: Samples for foraminifera picking were dried in the oven at 60oC before being re-soaked in distilled water. Samples were then wet sieved through a series of four mesh sizes before the size fractions were transferred to drying trays. After drying foraminifera were picked from under microscope for the large size fractions of >300 µm and >400µm. 10-15 white Gs. ruber were hand picked to give a total sample weight of 180-220µg for isotope analysis. The samples were washed in methanol and ultrasonicated for 30 secs to remove any surface and internal particles. The samples were analysed at the Research School of Earth Science, Australian National University, using an automated individual carbonate reaction (Kiel) device coupled with a Finnigan MAT-251 mass spectrometer.
Statement: Both 18-O and 13-C values are provided for 3.5cm, 5cm, 15cm, 20cm and then every 10cm down the core to depth of 120cm. Mass spectrometer was run concurrently with international standards NBS-19 and NBS-18, and has a very small analytical error. Parameters: Depth in core (cm), oxygen-18 G. ruber (parts per thousand), carbon-13 G. ruber (parts per thousand).

Notes

Credit
Funded by The Australian Research Council (ARC)
Credit
Funded by The Australian National University (ANU) Faculties Research Grant Scheme
Purpose
To determine the sedimentological variations with sea-level over the last glacial/ interglacial cycle in the Capricorn Channel. 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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152.63469,-22.89476 152.6353,-22.8948 152.63528,-22.89526 152.63466,-22.89528 152.63469,-22.89476

152.63498,-22.89502

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=166; downlimit=166

Subjects
51200000 | AMOEBOIDS | BIOLOGICAL CLASSIFICATION | EARTH SCIENCE | Foraminifers | Foraminifera | Foraminiferans | Foraminiferida | Isotopes | OCEAN/LAKE RECORDS | PALEOCLIMATE | PROTISTS | amount_of_carbon-13_isotope_g._ruber | amount_of_oxygen-18_isotope_g._ruber | core_depth | environment |

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(ANU_Bostock_GC09_1_data.xls)

uri : https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/102fd170-22b0-11dc-8748-00188b4c0af8/attachments/ANU_Bostock_GC09_1_data.xls

global : abd6d050-22b1-11dc-8748-00188b4c0af8

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  • global : 102fd170-22b0-11dc-8748-00188b4c0af8