Gawler Craton Airborne Survey Merge Radiometrics - U equivalent concentration image (AWAGS)  


Authors / CoAuthors

Geophysical Acquisition & Processing Section

Abstract

The radiometric, or gamma-ray spectrometric method, measures the natural variations in the gamma-rays detected near the Earth's surface as the result of the natural radioactive decay of potassium (K), uranium (U) and thorium (Th). The data collected are processed via standard methods to ensure the response recorded is that due only to the rocks in the ground. The results produce datasets that can be interpreted to reveal the geological structure of the sub-surface. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose. The Geological Survey of South Australia commissioned the Gawler Craton Airborne Survey (GCAS) as part of the PACE Copper initiative. The airborne geophysical survey was flown over parts of the Gawler Craton in South Australia. The program was designed to capture new baseline geoscientific data to provide further information on the geological context and setting of the area for mineral systems (http://energymining.sa.gov.au/minerals/geoscience/pace_copper/gawler_craton_airborne_survey). This radiometric uranium image has a cell size of 0.0004 degrees (approximately 41m) and shows uranium element concentration of the Gawler Craton Airborne Survey Magnetic Radiometric and DEM Merge, SA, 2017-2019 in units of parts per million (or ppm). Noise-adjusted singular value decomposition (NASVD) has been applied to the data. NASVD is a spectral component analysis procedure for the removal of noise from gamma-ray spectra. The data used to produce this image was acquired in 2019 by the SA Government, and consisted of 1660000 line-kilometres of data at 200m line spacing and 60m terrain clearance. To constrain long wavelengths in the grid, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid.

Product Type

dataset

eCat Id

144810

Contact for the resource

  Point of contact

Commonwealth of Australia (Geoscience Australia)  
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia

Keywords

theme.ANZRC Fields of Research.rdf
  • EARTH SCIENCES
( Data centre )
  • NCI
( Discipline )
  • Earth sciences
( Discipline )
  • geophysics
( Feature type )
  • image
( Place )
  • Australia
( Place )
  • SA
( Project )
  • survey 5000
( Theme )
  • AWAGS
( Theme )
  • GADDS2.0
( Theme )
  • radiometrics
( Theme )
  • uranium
( Theme )
  • airborne digital data
( Theme )
  • geophysical survey
( Theme )
  • rad
( Theme )
  • U
( Theme )
  • gamma-ray
( Theme )
  • spectrometry
( Theme )
  • pseudocolour image
( Theme )
  • raster
( Theme )
  • nasvd
  • Published_External

Publication Date

2020-11-09T00:00:00

Creation Date

2020-11-09T00:00:00

Security Constraints

Australian Government Security ClassificationSystem    

Classification - unclassified

Legal Constraints

Creative Commons Attribution 4.0 International Licence    

Access - license

Use - license

Status

completed

Purpose

Maintenance Information

notPlanned

Topic Category

geoscientificInformation

Series Information

Lineage

This Gawler Craton Airborne Survey Merge Radiometrics - U equivalent concentration image (AWAGS) is an airborne-derived radiometric uranium pseudocolour image for the Gawler Craton Airborne Survey Magnetic Radiometric and DEM Merge, SA, 2017-2019. The Geological Survey of South Australia commissioned the Gawler Craton Airborne Survey (GCAS) as part of the PACE Copper initiative. The airborne geophysical survey was flown over parts of the Gawler Craton in South Australia. The program was designed to capture new baseline geoscientific data to provide further information on the geological context and setting of the area for mineral systems (http://energymining.sa.gov.au/minerals/geoscience/pace_copper/gawler_craton_airborne_survey). The survey was acquired under the project No. 5000 for the geological survey of SA. The image has a cell size of 0.0004 degrees (approximately 41m). A total of 1660000 line-kilometres of data at a line spacing of 200m and60m terrain clearance were acquired to produce this image. This radiometric uranium image shows uranium element concentration of the Gawler Craton Airborne Survey Magnetic Radiometric and DEM Merge, SA, 2017-2019 in units of parts per million (or ppm). Noise-adjusted singular value decomposition (NASVD) has been applied to the data. NASVD is a spectral component analysis procedure for the removal of noise from gamma-ray spectra. To constrain long wavelengths in the image, an independent data set, the Australia-wide Airborne Geophysical Survey (AWAGS) airborne magnetic data, was used to control the base levels of the survey grid (Milligan et al., 2009). Details of the specifications of individual airborne surveys can be found in the Fourteenth Edition of the Index of Airborne Geophysical Surveys (Percival, 2014). This Index is also available online at http://pid.geoscience.gov.au/dataset/79134. References: Milligan, P.R., Minty, B.R.S., Richardson, M. & Franklin, R., 2009. The Australia-wide Airborne Geophysical Survey accurate continental magnetic coverage. Preview, No. 138, p. 1-128, Percival, P.J., 2014. Index of airborne geophysical surveys (Fourteenth Edition).

Parent Information

Geophysical Data Collection - Airborne Geophysics

UUID - ddeb0fc4-32e3-4913-80f2-f4249b17a925,

eCat ID - 111301

Extents

[-32.6744, -27.3246, 130.989, 138.0595]

Reference System

GDA94 (EPSG:4283)

Spatial Resolution

Service Information

Associations

Downloads and Links

File available for download in various formats from the GADDS2 portal  

/g/data/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/airborne_geophysics/SA/image/P5000/P5000-image-radiometric-u_conc-AWAGS_RAD_2019.nc file at NCI  

/g/data/iv65/Geoscience_Australia_Geophysics_Reference_Data_Collection/airborne_geophysics/SA/image/P5000/P5000-image-radiometric-u_conc-AWAGS_RAD_2019.nc file download  

Source Information

This Gawler Craton Airborne Survey Merge Radiometrics - U equivalent concentration image (AWAGS) includes airborne-derived radiometric uranium data for the Gawler Craton Airborne Survey Magnetic Radiometric and DEM Merge, SA, 2017-2019 acquired for the geological survey of SA