Brief 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
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: 27 06 2007
Data time period: 1997 to 1997
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)
global : 2b6c31c0-2465-11dc-95fb-00188b4c0af8
Identifiers
- global : be8d3fd0-246f-11dc-95fb-00188b4c0af8
