Sediment Data for Lord Howe Island Shelf

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

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Dataset citation

ANZLIC unique identifier: ANZCW0703016224

Title: Sediment Data for Lord Howe Island Shelf

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Custodian

Custodian: Geoscience Australia

Jurisdiction: Australia

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Geoscience Australia carried out a marine survey on Lord Howe Island shelf (NSW) in 2008 (SS06-2008) to map seabed bathymetry and characterise benthic environments through co-located sampling of surface sediments and infauna, rock coring, observation of benthic habitats using underwater towed video, and measurement of ocean tides and wave-generated currents. Sub-bottom profile data was also collected to map sediment thickness and shelf stratigraphy. Data and samples were acquired using the National Facility Research Vessel Southern Surveyor. Bathymetric data from this survey was merged with other pre-existing bathymetric data (including LADS) to generate a grid covering 1034 sq km. As part of a separate Geoscience Australia survey in 2007 (TAN0713), an oceanographic mooring was deployed on the northern edge of Lord Howe Island shelf. The mooring was recovered during the 2008 survey following a 6 month deployment. Seabed sediment samples were collected by a Smith McIntyre grab at a total of 36 locations (see Brooke et al. 2010). The full sample set represents 16 sampling stations, with multiple (2 or 3) samples taken at 10 of these stations.

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: 158.95 -31.4, 159.21 -31.4, 159.21 -31.62, 158.95 -31.62, 158.95 -31.4,

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

Geographic bounding box:: North bounding latitude: -31.4 °; South bounding latitude: -31.62 °; East bounding longitude: 159.21 °; West bounding longitude: 158.95 °

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Data currency

Beginning date: 2008-04-16

Ending date: 2008-05-01

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Dataset status

Progress: Complete

Maintenance and update frequency: Not Known

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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

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Data quality

Lineage:

Sediment grabs typically recovered a sample up to 5 cm by 12 cm in area and 5 cm thick, from which a 50 - 100 g sub-sample was taken to a depth of ~2 cm. 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 and sand fraction by acid digestion and measurement of resultant pressure, following Muller and Gastner (1979). Sediment data for Lord Howe Island shelf are a first generation product derived from the physical samples. No transformation of the data has been undertaken.

Positional accuracy:

Approximately 5 m, based on uncertainty of the grab position when lowered from the vessel.

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. Not all samples contained sufficient mud for carbonate analysis.

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:

completed

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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

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Metadata information

Metadata date: 2013-03-08

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Additional metadata

Metadata reference XHTML: http://www.ga.gov.au/meta/ANZCW0703016224.html

Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703016224.xml

Authors:Geoscience Australia

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