Brief description
A gravity core (GC13) was collected from a depth of 1482 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. Peaks in the larger grainsize fractions correlate with pteropod accumulations in the sediment, especially in the lower half of the core at 260cm and 290cm. The absence of complete pteropods at the top of the core may be related to the fact that GC13 is presently situated below the aragonite lysocline. This suggests that the aragonite lysocline was probably deeper during the glacials.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 splits 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 0cm, 5cm, 10cm, 15cm, 20cm and then every 10cm down the core to a depth of 350cm. 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: 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
Oceans | Marine Sediments | Sediment Grain Size |
core_depth |
environment |
grainsize_size_category |
User Contributed Tags
Login to tag this record with meaningful keywords to make it easier to discover
Other Information
(ANU_Bostock_GC13_3_data.xls)
global : e231da30-2533-11dc-aba4-00188b4c0af8
Identifiers
- global : 5d16d710-2533-11dc-aba4-00188b4c0af8
