Data

Age vs. depth of core MD002361 (shelf edge offshore Western Australia). Age has been calculated using radiocarbon dating and modelling based on oxygen isotope records.

Australian Ocean Data Network
Spooner, Michelle ; De Deckker, Patrick
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/8f0bb9f0-07f3-11dc-92a7-00188b4c0af8&rft.title=Age vs. depth of core MD002361 (shelf edge offshore Western Australia). Age has been calculated using radiocarbon dating and modelling based on oxygen isotope records.&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/8f0bb9f0-07f3-11dc-92a7-00188b4c0af8&rft.description=Radiocarbon dating was used to construct an age model for the upper sections of core MD002361 to a depth of 205cm, after which the age-model was based on the chronology of Bassinot et al. as the core extends beyond the Marine Isotope Stages (MIS) of SPECMAP. The age versus depth profile for this core shows a step-like pattern with increased sedimentation rates during interglacial periods and decreased rates during glacial periods. The average sedimentation rate over the length of the core is 2.5cm/1000yrs, with a high sedimentation rate illustrated during the holocene (15cm/1000yrs). It appears that the sedimentation rate may be affected by river discharge, with an increase in red-brown sediment during the interglacial periods. This is shown with an increase in sedimentation rate during MIS 5 and MIS 11. The age at the deepest part of the core (1360cm) is ~549,058yrs BP.Statement: Radiocarbon dating was used to construct an age model for the upper sections of the core. Radiocarbon ages were obtained from 12 sampled down to a depth of 204.5cm. The age model used for the rest of the core is based on the chronology of Bassinot et al. as the core extends beyond the MIS of SPECMAP. The Bassinot et al. (1994) study captures isotopic events in the tropical Indian Ocean and is accurately tuned to the astronomical time scale.Statement: Sample collected using a piston core. The chronology of the core was deduced from radiocarbon dating using 14C accelerator mass spectrometer analyses and biostratigraphic chronology. Radiocarbon dates were calibrated using the CALIB 5.0 program and the Marine4 radiocarbon age calibration curve. For the oceanic reservoir correction the estimate of the regional DR mean for the NW Australia and Java of 67±24 was obtained from the CALIB Marine Reservoir Correction Database.&rft.creator=Spooner, Michelle &rft.creator=De Deckker, Patrick &rft.date=2007&rft.coverage=113.48338,-22.09163 113.48516,-22.09177 113.48469,-22.09283 113.48360,-22.09270 113.48338,-22.09163&rft.coverage=westlimit=113; southlimit=-22.5; eastlimit=113.5; northlimit=-22&rft.coverage=westlimit=113; southlimit=-22.5; eastlimit=113.5; northlimit=-22&rft.coverage=uplimit=1805; downlimit=1805&rft.coverage=uplimit=1805; downlimit=1805&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=Age vs. Depth Profile&rft_subject=core_depth&rft_subject=age_of_core&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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Radiocarbon dating was used to construct an age model for the upper sections of core MD002361 to a depth of 205cm, after which the age-model was based on the chronology of Bassinot et al. as the core extends beyond the Marine Isotope Stages (MIS) of SPECMAP. The age versus depth profile for this core shows a step-like pattern with increased sedimentation rates during interglacial periods and decreased rates during glacial periods. The average sedimentation rate over the length of the core is 2.5cm/1000yrs, with a high sedimentation rate illustrated during the holocene (15cm/1000yrs). It appears that the sedimentation rate may be affected by river discharge, with an increase in red-brown sediment during the interglacial periods. This is shown with an increase in sedimentation rate during MIS 5 and MIS 11. The age at the deepest part of the core (1360cm) is ~549,058yrs BP.

Lineage

Statement: Radiocarbon dating was used to construct an age model for the upper sections of the core. Radiocarbon ages were obtained from 12 sampled down to a depth of 204.5cm. The age model used for the rest of the core is based on the chronology of Bassinot et al. as the core extends beyond the MIS of SPECMAP. The Bassinot et al. (1994) study captures isotopic events in the tropical Indian Ocean and is accurately tuned to the astronomical time scale.
Statement: Sample collected using a piston core. The chronology of the core was deduced from radiocarbon dating using 14C accelerator mass spectrometer analyses and biostratigraphic chronology. Radiocarbon dates were calibrated using the CALIB 5.0 program and the Marine4 radiocarbon age calibration curve. For the oceanic reservoir correction the estimate of the regional DR mean for the NW Australia and Java of 67±24 was obtained from the CALIB Marine Reservoir Correction Database.

Notes

Credit
The Australian National University (ANU)
Credit
Funded by The National Oceans Office (NOO)
Credit
Funded by The Australian Research Council (ARC)
Credit
Funded by The French Polar Institute
Credit
Funded by The Australian Institute of Nuclear Science Engineering (AINSE)
Credit
Funded by The Murray Darling Basin Commission
Purpose
To provide insight into general palaeoceanographic conditions on the shelf edge offshore Western Australia. Was part of a larger undertaking to try and define the history of the Leeuwin Current. Age vs depth profile information can be used to indicate sedimentation rates.

Issued: 21 03 2007

Data time period: 2000-01-01 to 2000-01-01

This dataset is part of a larger collection

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113.48338,-22.09163 113.48516,-22.09177 113.48469,-22.09283 113.4836,-22.0927 113.48338,-22.09163

113.48427,-22.09223

113.5,-22 113.5,-22.5 113,-22.5 113,-22 113.5,-22

113.25,-22.25

text: westlimit=113; southlimit=-22.5; eastlimit=113.5; northlimit=-22

text: uplimit=1805; downlimit=1805

Subjects
Age vs. Depth Profile | EARTH SCIENCE | MARINE SEDIMENTS | OCEANS | Sedimentation | age_of_core | core_depth | environment |

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Other Information
(ANU_Spooner_MD002361_2_data.xls)

uri : https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/8f0bb9f0-07f3-11dc-92a7-00188b4c0af8/attachments/ANU_Spooner_MD002361_2_data.xls

Core data - Leeuwin Current (aodn:bluenet_datasets_leeuwin_current)

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

global : 85ccfd40-07f8-11dc-92a7-00188b4c0af8

Identifiers
  • global : 8f0bb9f0-07f3-11dc-92a7-00188b4c0af8