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Sediment Data for Carnarvon Shelf

Note: This metadata describes the dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2.


Dataset citation

ANZLIC unique identifier: ANZCW0703016222

Title: Sediment Data for Carnarvon Shelf


Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia


Description

Abstract:

Geoscience Australia carried out a marine survey on Carnarvon shelf (WA) in 2008 (SOL4769) to map seabed bathymetry and characterise benthic environments through co-located sampling of surface sediments and infauna, observation of benthic habitats using underwater towed video and stills photography, and measurement of ocean tides and wave-generated currents. Data and samples were acquired using the Australian Institute of Marine Science (AIMS) Research Vessel Solander. Bathymetric mapping, sampling and video transects were completed in three survey areas that extended seaward from Ningaloo Reef to the shelf edge, including: Mandu Creek (80 sq km); Point Cloates (281 sq km), and; Gnaraloo (321 sq km). Additional bathymetric mapping (but no sampling or video) was completed between Mandu creek and Point Cloates, covering 277 sq km and north of Mandu Creek, covering 79 sq km. Two oceanographic moorings were deployed in the Point Cloates survey area. The survey also mapped and sampled an area to the northeast of the Muiron Islands covering 52 sq km. Seabed sediment samples were collected by a Smith McIntyre grab at a total of 275 locations, divided between Mandu Creek (n=81), Point Cloates (n=92), Gnaraloo (n=92) and Muiron Islands (n=10). The full sample set represents 102 sampling stations at which two sediment grabs were collected in close proximity. The exception to this was at Mandu Creek where three grabs were collected at 19 stations and at Gnaraloo where single grabs were taken at three stations. At Muiron Islands, single grabs were collected at five stations and two grabs at three stations (see Brooke et al. 2009).

ANZLIC search words:

  • MARINE Surveys
  • MARINE Geology and Geophysics

Spatial domain:

locality map

Geographic extent name: AUSTRALIA EXCLUDING EXTERNAL TERRITORIES - AUS - Australia - Australia

Geographic extent polygon: 113.21 -21.56, 114.37 -21.56, 114.37 -23.89, 113.21 -23.89, 113.21 -21.56,

Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register

Geographic bounding box:
North bounding latitude: -21.56 °
South bounding latitude: -23.89 °
East bounding longitude: 114.37 °
West bounding longitude: 113.21 °

Data currency

Beginning date: 2008-08-12

Ending date: 2008-09-15


Dataset status

Progress: Complete

Maintenance and update frequency: Not Known


Access

Stored data format:
DIGITAL - xls Microsoft Excel spreadsheet Excel GDA94
Available format type:
DIGITAL - xls Microsoft Excel spreadsheet Excel GDA94

Access constraints:

This material is released under the Creative Commons Attribution 3.0 Australia Licence.

Free Data Download

Data quality

Lineage:

Sediment grabs typically recovered about 0.1 cubic metres of undisturbed sediment, from which a 250 - 500 g sub-sample was taken to a depth of ~5 cm. Sub-samples were described from visual inspection, noting grain size, sorting, composition and Munsell colour then stored in plastic bags and refrigerated. In the laboratory, samples were used for grain size analysis and measurement of carbonate content on separate splits. Grain size measurement was undertaken by wet sieving to determine mud (less than 63 microns), sand (63-2000 microns) and gravel (greater than2000 microns) fractions as percentage of dry weight. A separate sub-sample (~1g) was used for laser diffraction measurement of the mud and sand fractions using a Malvern Mastersizer 2000, with results expressed as percentage of the total particle volume based on an average of three measurements on each sample. Summary statistics include arithmetic mean, standard deviation, skewness and kurtosis. Carbonate content was measured on the bulk fraction, sand fraction and mud fraction by acid digestion and measurement of resultant pressure, following Muller and Gastner (1979). The carbonate content of the gravel fraction was determined by visual assessment. Sediment data for the Carnarvon Shelf are a first generation product derived from the physical samples. No transformation of the data has been undertaken.

Positional accuracy:

Approximately 5 m

Attribute accuracy:

The accuracy of laser derived measurements are checked by glass bead verification, whereby glass bead standards are analysed and verified against specification details for that batch of beads.

Logical Consistency:

All samples in this data set were sampled and processed using a standard operating procedure, details of which can be obtained from Geoscience Australia upon request.

Completeness:

This data set is complete. Samples with a "no data" entry did not have sufficient sediment for analysis.


Contact information

Contact organisation: Commonwealth of Australia (Geoscience Australia) (GA)
Contact position: Manager Client Services
Mail address: Cnr Jerrabomberra Ave and Hindmarsh Dr
Mail address: GPO Box 378
Locality: Canberra
State: ACT
Country: Australia
Postcode: 2601
Telephone: 02 6249 9966
Facsimile: 02 6249 9960
Electronic mail address: sales@ga.gov.au

Metadata information

Metadata date: 2013-09-27


Additional metadata

Metadata reference XHTML: http://www.ga.gov.au/meta/ANZCW0703016222.html

Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703016222.xml

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Authors:Geoscience Australia
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