Name: Sediment

Display Field: Sample_ID

Type: Feature Layer

Geometry Type: esriGeometryPoint

Description: This data layer comprised seabed sediment samples collected from four survey areas by either a Smith McIntyre grab or box corer at 62 stations, divided between Area 1 (n=22), Area 2 (n=17), Area 3 (n=21) and Area 4 (n=2). 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 than 2000 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 Oceanic Shoals Survey are a first generation product derived from the physical samples. No transformation of the data has been undertaken.

Copyright Text: © Commonwealth of Australia (Geoscience Australia) 2016. This product is released under the Creative Commons Attribution 4.0 International Licence. http://creativecommons.org/licenses/by/4.0/legalcode

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Supported Query Formats: JSON, geoJSON

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Extent:

XMin: 126.91210000000001
YMin: -12.217829999999992
XMax: 127.45223299999998
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Spatial Reference: 4326  (4326)

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Label: Seabed Sediment Samples
Description:
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Type ID Field: null

Fields:

• objectid ( type: esriFieldTypeOID, alias: OBJECTID )
• sampleno ( type: esriFieldTypeDouble, alias: SAMPLENO )
• sample_id ( type: esriFieldTypeString, alias: Sample_ID, length: 255 )
• latitude ( type: esriFieldTypeDouble, alias: Latitude )
• longitude ( type: esriFieldTypeDouble, alias: Longitude )
• depth ( type: esriFieldTypeDouble, alias: Depth )
• mud__ ( type: esriFieldTypeDouble, alias: Mud__ )
• sand__ ( type: esriFieldTypeDouble, alias: Sand__ )
• gravel__ ( type: esriFieldTypeDouble, alias: Gravel__ )
• mean__microns_ ( type: esriFieldTypeDouble, alias: Mean__microns_ )
• standard_deviation__microns_ ( type: esriFieldTypeDouble, alias: Standard_Deviation__microns_ )
• kurtosis ( type: esriFieldTypeDouble, alias: Kurtosis )
• skewness ( type: esriFieldTypeDouble, alias: Skewness )
• mode__microns_ ( type: esriFieldTypeDouble, alias: Mode__microns_ )
• shape ( type: esriFieldTypeGeometry, alias: Shape )

Supported Operations:   Query   Query Attachments   Generate Renderer   Return Updates

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