Brief description
A gravity core (GC14) was collected from a depth of 2004 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. It appears that the core extends back to MIS 3 (Marine Isotope Stage). From limited depth matching with the Martinson et al. (1987) SPECMAP age-model it is extremely difficult to determine a sedimentation rate, however, it exhibits a relatively uniform rate throughout the core of ~4cm/kyr. This is a fairly high sedimentation rate for a core this distal and abyssal.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 1cm, 5cm, 10cm, 15cm, 20cm and then every 10cm down the core to a depth of 260cm. These estimates were made by correlating 18-O values with the SPECMAP age-model. Values of 18-O have a very small analytical error. From limited depth matching with the Martinson et al.(1987) SPECMAP model, it is extremely difficult to determine a sedimentation rate. The rates calculated are high for a core this distal and abyssal, however without 14-C dates it is the best estimate at present.
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=2004; downlimit=2004
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_GC14_2_data.xls)
global : 13f86210-29ca-11dc-b961-00188b4c0af8
Identifiers
- global : 56f717d0-29d1-11dc-b961-00188b4c0af8
