Brief description
The AusAEM1 airborne electromagnetic survey extends across an area exceeding 1.1 million km2 over Queensland and the Northern Territory. Approximately 60,000 line kilometres of data were acquired at a nominal line spacing of 20 km (Ley-Cooper et al., 2020). To improve targeting and outcomes for mineral, energy and groundwater exploration, we conducted a regional interpretation of this dataset to characterise the subsurface geology of northern Australia. The interpretation includes the depth to chronostratigraphic surfaces, compilation of stratigraphic relationship information, and delineation of structural and electrically conductive features. In addition to help connecting correlative outcropping units separated by up to hundreds of kilometres, the results led to 3D mapping of palaeovalleys and prompted further investigation of electrical conductors and their relationship to structural features and mineralisation. Approximately 200,000 regional depth point measurements, each attributed with detailed geological information, are an important step towards a national geological framework, and offer a regional context for more detailed, smaller-scale AEM surveys. Refer to Wong et al., (2020) for more details on the AusAEM1 interpretation.Lineage
Maintenance and Update Frequency: asNeededNotes
PurposeOur interpretation focused on delineating major chronostratigraphic boundaries, specifically the bases of Cenozoic, Mesozoic, Paleozoic and Neoproterozoic units. These boundaries are stored in, and are retrievable from, the Estimates of Geological and Geophysical Surfaces database. Attributed metadata provide additional information on chronostratigraphic relationships, structural features and the data that support the interpretation. These metadata are not only important for cover thickness modelling, but are also intended for use in many other applications, such as exploration targeting or understanding the upper-crustal structural evolution of northern Australia.
Issued: 26 08 2021
Data time period: 2019-02-01 to 2021-01-22
text: westlimit=132; southlimit=-24.10; eastlimit=144; northlimit=-16.00
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- DOI : 10.26186/145120
- URI : pid.geoscience.gov.au/dataset/ga/145120
- global : 430acf3d-cdf6-4a78-abbc-d2f9eae5bf91