Brief description
The age with depth of core MD032607 is calculated through 18O values, which are then correlated with the SPECMAP age-model. Based upon these measurements the age at the deepest part of the core (3270cm) is ~176,590yrs BP. The age vs. depth profile for this core indicates a major increase in the sedimentation rate during the initial phase of MIS 6, when the sedimentation rate is ~41cm/1000yrs. The average sedimentation rate over the length of the core is 18.7cm/1000yrs.Lineage
Maintenance and Update Frequency: notPlanned
Statement: The age scale is based entirely on the record of 18O throughout the core. The analytical error in calculating 18O is ±0.08 per mil. Isotope records for 18O (acting as a proxy for age) were calculated every 5cm down to a depth of 200cm. From this point, down to the end of the core at 3270cm, data is not recorded for regular intervals. Data is presented for every 30-120cm of the remaining core length.
Statement: Sample collected using a piston core. The chronology of the core was deduced from oxygen isotope stratigraphy of Globigerina bulloides. Carbonate tests collected using 63µm mesh after preparation. Estimates of 18O at various depths were made by the Finnigan MAT251 Mass Spectrometer at GEOMAR in Kiel, Germany. The 18O data was correlated against the SPECMAP age model of Martinson et al. (1987).
Notes
CreditThe Australian National University (ANU)
Credit
Funded by The National Oceans Office (NOO)
Funded by The National Oceans Office (NOO)
Credit
Funded by The Australian Research Council (ARC)
Funded by The Australian Research Council (ARC)
Credit
Funded by The French Polar Institute
Funded by The French Polar Institute
Credit
Funded by The Australian Institute of Nuclear Science Engineering (AINSE)
Funded by The Australian Institute of Nuclear Science Engineering (AINSE)
Credit
Funded by The Murray Darling Basin Commission
Funded by The Murray Darling Basin Commission
Purpose
To provide insight into general palaeoceanographic conditions offshore South Australia. Was part of a larger undertaking to try and define the history of the Leeuwin Current, in particular the reduction/absence of the current during glacial periods. Age vs depth profile can provide information on sedimentation rates over time.
To provide insight into general palaeoceanographic conditions offshore South Australia. Was part of a larger undertaking to try and define the history of the Leeuwin Current, in particular the reduction/absence of the current during glacial periods. Age vs depth profile can provide information on sedimentation rates over time.
Issued: 21 03 2007
Data time period: 2003-01-01 to 2003-01-01
text: westlimit=137; southlimit=-40; eastlimit=137.5; northlimit=-39.5
text: uplimit=865; downlimit=865
Subjects
51200000 |
Age vs. depth profile |
EARTH SCIENCE |
MARINE SEDIMENTS |
OCEAN/LAKE RECORDS |
OCEANS |
Oxygen Isotopes |
PALEOCLIMATE |
Sedimentation |
age_of_core |
core_depth |
environment |
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Other Information
(ANU_Spooner_MD032607_2_data.xls)
global : 1bca5f00-07fd-11dc-92a7-00188b4c0af8
Identifiers
- global : 0595d210-07fc-11dc-92a7-00188b4c0af8
