Brief description
A gravity core (GC13) was collected from a depth of 1482 mbsl within the Capricorn Channel, southern Great Barrier Reef (GBR). Isotopic values for 18-O and 13-C were obtained from Globigerinoides ruber and correlated with the SPECMAP age-model. The age-model that was produced plausibly extends back to Marine Isotope Stage (MIS) 6, with approximate sedimentation rates calculated according to this model. Sedimentation rates fluctuate from 5cm/kyr during the last transition and interglacial, to 1cm/kyr during the glacial maximum.Lineage
Maintenance and Update Frequency: notPlanned
Statement: Age-model constructed by correlating 18-O 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 350cm. These estimates were made by correlating 18-O values with the SPECMAP age-model. Values of 18-O have a very small analytical error.
Notes
CreditFunded by The Australian Research Council (ARC)
Credit
Funded by The Australian National University (ANU) Faculties Research Grant Scheme
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.
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
text: westlimit=154; southlimit=-24; eastlimit=154.5; northlimit=-23.5
text: uplimit=1482; downlimit=1482
Subjects
51200000 |
EARTH SCIENCE |
Foraminfera |
Foraminiferans |
Foraminiferida |
MARINE SEDIMENTS |
OCEANS |
Sedimentation |
age_model |
core_depth |
environment |
sedimentation_rate |
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Other Information
(ANU_Bostock_GC13_2_data.xls)
global : e231da30-2533-11dc-aba4-00188b4c0af8
Identifiers
- global : 19a86b60-2533-11dc-aba4-00188b4c0af8
