Data

Age vs Depth profile of core GC11, collected from the Capricorn Channel off the Eastern Australian Coast

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/be8d3fd0-246f-11dc-95fb-00188b4c0af8&rft.title=Age vs Depth profile of core GC11, collected from the Capricorn Channel off the Eastern Australian Coast&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/be8d3fd0-246f-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). Isotopic values for 18O and 13C were obtained from Gs. ruber and correlated with the SPECMAP age-model. The results highlight 4 glacial cycles, incorporating Marine Isotope Stage (MIS) 1 through to MIS 11. Isotopically heavier 18O values at ~460cm, ~345cm, 150cm, and 30cm correspond respectively to MIS 10 (359 kyr BP), MIS 8 (260 kyr BP), MIS 6 (140 kyr BP) and the LGM (20 kyr BP). Sedimentation rates are typically low, Maintenance and Update Frequency: notPlannedStatement: Age-model constructed by correlating 18O data with the SPECMAP model of Martinson et al. (1987). Samples were dried in the oven before being re-soaked in distilled water. Samples 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 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 surface and internal particles. 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: Age estimates are provided for 5cm, 10cm, 15cm, 20cm and then every 10cm down the core to a depth of 550cm. These estimates were made by correlating 18O values with the SPECMAP age-model. Values of 18O have a very small analytical error.&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=SEDIMENTATION&rft_subject=EARTH SCIENCE&rft_subject=OCEANS&rft_subject=MARINE SEDIMENTS&rft_subject=51200000&rft_subject=Foraminiferida&rft_subject=Foraminiferans&rft_subject=Foraminifera&rft_subject=core_depth&rft_subject=age_model&rft_subject=sedimentation_rate&rft.type=dataset&rft.language=English Access the data
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http://creativecommons.org/licenses/by/2.5/au/

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). Isotopic values for 18O and 13C were obtained from Gs. ruber and correlated with the SPECMAP age-model. The results highlight 4 glacial cycles, incorporating Marine Isotope Stage (MIS) 1 through to MIS 11. Isotopically heavier 18O values at ~460cm, ~345cm, 150cm, and 30cm correspond respectively to MIS 10 (359 kyr BP), MIS 8 (260 kyr BP), MIS 6 (140 kyr BP) and the LGM (20 kyr BP). Sedimentation rates are typically low, <1 cm/kyr to ~4 cm/kyr. The higher sedimentation rates are evident at glacial / interglacial terminations, but then drop off rapidly in the interglacials.

Lineage

Maintenance and Update Frequency: notPlanned
Statement: Age-model constructed by correlating 18O data with the SPECMAP model of Martinson et al. (1987). Samples were dried in the oven before being re-soaked in distilled water. Samples 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 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 surface and internal particles. 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: Age estimates are provided for 5cm, 10cm, 15cm, 20cm and then every 10cm down the core to a depth of 550cm. These estimates were made by correlating 18O values with the SPECMAP age-model. Values of 18O have a very small analytical error.

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: 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
51200000 | EARTH SCIENCE | Foraminifera | Foraminiferans | Foraminiferida | MARINE SEDIMENTS | OCEANS | Sedimentation | age_model | core_depth | environment | sedimentation_rate |

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Other Information
(ANU_Bostock_GC11_2_data.xls)

url : https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/be8d3fd0-246f-11dc-95fb-00188b4c0af8/attachments/ANU_Bostock_GC11_2_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 : be8d3fd0-246f-11dc-95fb-00188b4c0af8