Brief description
A gravity core (GC12) was collected from a depth of 990.5 mbsl within the Capricorn Channel, southern Great Barrier Reef (GBR). Samples were separated into different size fractions to determine the % of each grainsize at each sample depth. Although not overly accurate, the information is correlated with analyses of other parameters to impart clues to the environmental changes within the core. The smallest size fraction (<100µm) dominates at all depths, with an average of 95% in this size bracket at the base of the core. A peak in the larger grainsize fraction at 490cm is the result of a pteropod layer within the sediments. These pteropod accumulations are regular features within the cores. The exact reason for their occurence is unknown.Lineage
Maintenance and Update Frequency: notPlanned
Statement: Samples were dried in the oven at 60oC before being re-soaked in distilled water. Samples were then wet sieved through a series of four mesh sizes (400µm, 300µm, 200µm and 100µm). Once the size fractions within the sample were separated into a series of beakers, the excess water was siphoned off using a syringe before being transferred to drying trays. After drying the size fractions were weighed to determine the % of each grainsize from the overall collected dry sample.
Statement: Because of the sieve mesh sizes, the samples were split in 5 groups dependent on grainsize: >400µm, 400-300µm, 300-200µm, 200-100µm and <100µm. Values are provided as a percentage of the total dry weight. Samples were analysed for 2.5cm, 5cm, 10cm, 15cm, 20cm and then every 10cm down the core to a depth of 510cm. The percentage values for grainsize at each sample depth are not accurate. This is due to wastage during washing and sieving and occasional spills.
Parameters: Depth through core (cm), grainsize (µm), percentage of total dry mass at each sample depth (%).
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: 28 06 2007
Data time period: 1997 to 1997
text: westlimit=151.5; southlimit=-24.5; eastlimit=153; northlimit=-23
text: uplimit=990.5; downlimit=990.5
Subjects
Oceans | Marine Sediments | Sediment Grain Size |
core_depth |
geoscientificInformation |
grainsize_size_category |
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Other Information
(ANU_Bostock_GC12_3_data.xls)
global : 442c6f30-2501-11dc-aba4-00188b4c0af8
Identifiers
- global : 253926d0-250c-11dc-aba4-00188b4c0af8
